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* [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
@ 2020-07-13 12:22 Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 01/35] xen-pciback: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (36 more replies)
  0 siblings, 37 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas
  Cc: Rich Felker, Martin K. Petersen, linux-sh, linux-pci, linux-nvme,
	Yicong Yang, Keith Busch, netdev, Paul Mackerras, linux-i2c,
	bcm-kernel-feedback-list, sparclinux, rfi, Toan Le, Greg Ungerer,
	Marek Vasut, Rob Herring, Stefano Stabellini, Sagi Grimberg,
	Yoshinori Sato, linux-scsi, Michael Ellerman, linux-atm-general,
	Russell King, Realtek linux nic maintainers, Christoph Hellwig,
	Ley Foon Tan, Geert Uytterhoeven, Rafał Miłecki,
	Chas Williams, Benjamin Herrenschmidt, xen-devel, Matt Turner,
	linux-mips, linux-kernel-mentees, Kevin Hilman, Guenter Roeck,
	linux-hwmon, Jean Delvare, Andrew Donnellan, Arnd Bergmann,
	Ray Jui, James E.J. Bottomley, Yue Wang, Jens Axboe,
	Jakub Kicinski, linux-m68k, Lorenzo Pieralisi, Ivan Kokshaysky,
	Michael Buesch, linux-amlogic, Boris Ostrovsky, Guan Xuetao,
	linux-arm-kernel, Richard Henderson, Juergen Gross, Michal Simek,
	Thomas Bogendoerfer, Scott Branden, Bjorn Helgaas, Jingoo Han,
	Saheed O. Bolarinwa, Yoshihiro Shimoda, linux-wireless,
	linux-kernel, linux-renesas-soc, Brian King, Philipp Zabel,
	linux-alpha, Frederic Barrat, Gustavo Pimentel, linuxppc-dev,
	David S. Miller, Heiner Kallweit



This goal of these series is to move the definition of *all* PCIBIOS* from
include/linux/pci.h to arch/x86 and limit their use within there.
All other tree specific definition will be left for intact. Maybe they can
be renamed.

PCIBIOS* is an x86 concept as defined by the PCI spec. The returned error
codes of PCIBIOS* are positive values and this introduces some complexities
which other archs need not incur.

PLAN:

1.   [PATCH v0 1-36] Replace all PCIBIOS_SUCCESSFUL with 0

2a.  Audit all functions returning PCIBIOS_* error values directly or
     indirectly and prevent possible bug coming in (2b)

2b.  Make all functions returning PCIBIOS_* error values call 
     pcibios_err_to_errno(). *This will change their behaviour, for good.*

3.   Clone a pcibios_err_to_errno() into arch/x86/pci/pcbios.c as _v2.
     This handles the positive error codes directly and will not use any
     PCIBIOS* definitions. So calls to it have no outside dependence.

4.   Make all x86 codes that needs to convert to -E* values call the 
     cloned version - pcibios_err_to_errno_v2()

5.   Assign PCIBIOS_* errors values directly to generic -E* errors

6.   Refactor pcibios_err_to_errno() and mark it deprecated

7.   Replace all calls to pcibios_err_to_errno() with the proper -E* value
     or 0.

8.   Remove all PCIBIOS* definitions in include/linux/pci.h and 
     pcibios_err_to_errno() too.

9.   Redefine all PCIBIOS* definitions with original values inside 
     arch/x86/pci/pcbios.c

10.  Redefine pcibios_err_to_errno() inside arch/x86/pci/pcbios.c

11.  Replace pcibios_err_to_errno_v2() calls with pcibios_err_to_errno()

12.  Remove pcibios_err_to_errno_v2()

Suggested-by: Bjorn Helgaas <bjorn@helgaas.com>
Suggested-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>


Bolarinwa Olayemi Saheed (35):
  Change PCIBIOS_SUCCESSFUL to 0
  Change PCIBIOS_SUCCESSFUL to 0
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Fix Style ERROR: assignment in if condition
  Change PCIBIOS_SUCCESSFUL to 0
  Change PCIBIOS_SUCCESSFUL to 0
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Change PCIBIOS_SUCCESSFUL to 0
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks
  Change PCIBIOS_SUCCESSFUL to 0
  Tidy Success/Failure checks

 arch/alpha/kernel/core_apecs.c                |  4 +--
 arch/alpha/kernel/core_cia.c                  |  4 +--
 arch/alpha/kernel/core_irongate.c             |  4 +--
 arch/alpha/kernel/core_lca.c                  |  4 +--
 arch/alpha/kernel/core_marvel.c               |  4 +--
 arch/alpha/kernel/core_mcpcia.c               |  4 +--
 arch/alpha/kernel/core_polaris.c              |  4 +--
 arch/alpha/kernel/core_t2.c                   |  4 +--
 arch/alpha/kernel/core_titan.c                |  4 +--
 arch/alpha/kernel/core_tsunami.c              |  4 +--
 arch/alpha/kernel/core_wildfire.c             |  4 +--
 arch/alpha/kernel/sys_miata.c                 |  2 +-
 arch/arm/common/it8152.c                      |  4 +--
 arch/arm/mach-cns3xxx/pcie.c                  |  2 +-
 arch/arm/mach-footbridge/dc21285.c            |  4 +--
 arch/arm/mach-iop32x/pci.c                    |  6 ++--
 arch/arm/mach-ixp4xx/common-pci.c             |  8 ++---
 arch/arm/mach-orion5x/pci.c                   |  4 +--
 arch/arm/plat-orion/pcie.c                    |  8 ++---
 arch/m68k/coldfire/pci.c                      |  8 ++---
 arch/microblaze/pci/indirect_pci.c            |  4 +--
 arch/mips/pci/fixup-ath79.c                   |  2 +-
 arch/mips/pci/ops-bcm63xx.c                   | 14 ++++----
 arch/mips/pci/ops-bonito64.c                  |  4 +--
 arch/mips/pci/ops-gt64xxx_pci0.c              |  4 +--
 arch/mips/pci/ops-lantiq.c                    |  4 +--
 arch/mips/pci/ops-loongson2.c                 |  4 +--
 arch/mips/pci/ops-mace.c                      |  4 +--
 arch/mips/pci/ops-msc.c                       |  4 +--
 arch/mips/pci/ops-rc32434.c                   |  6 ++--
 arch/mips/pci/ops-sni.c                       |  4 +--
 arch/mips/pci/ops-tx3927.c                    |  2 +-
 arch/mips/pci/ops-tx4927.c                    |  2 +-
 arch/mips/pci/ops-vr41xx.c                    |  4 +--
 arch/mips/pci/pci-alchemy.c                   |  6 ++--
 arch/mips/pci/pci-ar2315.c                    |  5 ++-
 arch/mips/pci/pci-ar71xx.c                    |  4 +--
 arch/mips/pci/pci-ar724x.c                    |  6 ++--
 arch/mips/pci/pci-bcm1480.c                   |  4 +--
 arch/mips/pci/pci-bcm1480ht.c                 |  4 +--
 arch/mips/pci/pci-mt7620.c                    |  4 +--
 arch/mips/pci/pci-octeon.c                    | 12 +++----
 arch/mips/pci/pci-rt2880.c                    |  4 +--
 arch/mips/pci/pci-rt3883.c                    |  4 +--
 arch/mips/pci/pci-sb1250.c                    |  4 +--
 arch/mips/pci/pci-virtio-guest.c              |  4 +--
 arch/mips/pci/pci-xlp.c                       |  4 +--
 arch/mips/pci/pci-xlr.c                       |  4 +--
 arch/mips/pci/pci-xtalk-bridge.c              | 14 ++++----
 arch/mips/pci/pcie-octeon.c                   |  4 +--
 arch/mips/txx9/generic/pci.c                  |  5 ++-
 arch/powerpc/kernel/rtas_pci.c                |  4 +--
 arch/powerpc/platforms/4xx/pci.c              |  4 +--
 arch/powerpc/platforms/52xx/efika.c           |  4 +--
 arch/powerpc/platforms/52xx/mpc52xx_pci.c     |  4 +--
 arch/powerpc/platforms/82xx/pq2.c             |  2 +-
 arch/powerpc/platforms/85xx/mpc85xx_cds.c     |  2 +-
 arch/powerpc/platforms/85xx/mpc85xx_ds.c      |  2 +-
 arch/powerpc/platforms/86xx/mpc86xx_hpcn.c    |  2 +-
 arch/powerpc/platforms/chrp/pci.c             |  8 ++---
 arch/powerpc/platforms/embedded6xx/holly.c    |  2 +-
 .../platforms/embedded6xx/mpc7448_hpc2.c      |  2 +-
 arch/powerpc/platforms/fsl_uli1575.c          |  2 +-
 arch/powerpc/platforms/maple/pci.c            | 18 +++++-----
 arch/powerpc/platforms/pasemi/pci.c           |  6 ++--
 arch/powerpc/platforms/powermac/pci.c         |  8 ++---
 arch/powerpc/platforms/powernv/eeh-powernv.c  |  4 +--
 arch/powerpc/platforms/powernv/pci.c          |  4 +--
 arch/powerpc/platforms/pseries/eeh_pseries.c  |  4 +--
 arch/powerpc/sysdev/fsl_pci.c                 |  2 +-
 arch/powerpc/sysdev/indirect_pci.c            |  4 +--
 arch/powerpc/sysdev/tsi108_pci.c              |  4 +--
 arch/sh/drivers/pci/common.c                  |  3 +-
 arch/sh/drivers/pci/ops-dreamcast.c           |  4 +--
 arch/sh/drivers/pci/ops-sh4.c                 |  4 +--
 arch/sh/drivers/pci/ops-sh7786.c              |  8 ++---
 arch/sh/drivers/pci/pci.c                     |  2 +-
 arch/sparc/kernel/pci_common.c                | 28 +++++++--------
 arch/unicore32/kernel/pci.c                   |  4 +--
 drivers/atm/iphase.c                          | 20 ++++++-----
 drivers/atm/lanai.c                           |  8 ++---
 drivers/bcma/driver_pci_host.c                |  4 +--
 drivers/hwmon/sis5595.c                       | 13 +++----
 drivers/hwmon/via686a.c                       | 13 +++----
 drivers/hwmon/vt8231.c                        | 13 +++----
 drivers/i2c/busses/i2c-ali15x3.c              |  5 ++-
 drivers/i2c/busses/i2c-nforce2.c              |  3 +-
 drivers/i2c/busses/i2c-sis5595.c              | 15 +++-----
 drivers/misc/cxl/vphb.c                       |  4 +--
 drivers/net/ethernet/realtek/r8169_main.c     |  2 +-
 drivers/nvme/host/pci.c                       |  2 +-
 drivers/pci/access.c                          | 14 ++++----
 drivers/pci/controller/dwc/pci-meson.c        |  4 +--
 .../pci/controller/dwc/pcie-designware-host.c |  2 +-
 drivers/pci/controller/dwc/pcie-designware.c  |  4 +--
 drivers/pci/controller/dwc/pcie-hisi.c        |  4 +--
 drivers/pci/controller/dwc/pcie-tegra194.c    |  4 +--
 .../pci/controller/mobiveil/pcie-mobiveil.c   |  4 +--
 drivers/pci/controller/pci-aardvark.c         |  4 +--
 drivers/pci/controller/pci-ftpci100.c         |  4 +--
 drivers/pci/controller/pci-hyperv.c           |  8 ++---
 drivers/pci/controller/pci-mvebu.c            |  4 +--
 drivers/pci/controller/pci-thunder-ecam.c     | 36 +++++++++----------
 drivers/pci/controller/pci-thunder-pem.c      |  4 +--
 drivers/pci/controller/pci-xgene.c            |  5 ++-
 drivers/pci/controller/pcie-altera.c          | 16 ++++-----
 drivers/pci/controller/pcie-iproc.c           | 10 +++---
 drivers/pci/controller/pcie-mediatek.c        |  4 +--
 drivers/pci/controller/pcie-rcar-host.c       |  8 ++---
 drivers/pci/controller/pcie-rockchip-host.c   | 10 +++---
 drivers/pci/pci-bridge-emul.c                 | 14 ++++----
 drivers/pci/pci.c                             |  8 ++---
 drivers/pci/pcie/bw_notification.c            |  4 +--
 drivers/pci/probe.c                           |  4 +--
 drivers/pci/quirks.c                          |  4 +--
 drivers/pci/syscall.c                         |  8 ++---
 drivers/pci/xen-pcifront.c                    |  2 +-
 drivers/scsi/ipr.c                            | 16 ++++-----
 drivers/scsi/pmcraid.c                        |  6 ++--
 drivers/ssb/driver_gige.c                     |  4 +--
 drivers/ssb/driver_pcicore.c                  |  4 +--
 drivers/xen/xen-pciback/conf_space.c          |  2 +-
 122 files changed, 347 insertions(+), 369 deletions(-)

-- 
2.18.2

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 01/35] xen-pciback: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: " Saheed O. Bolarinwa
                   ` (35 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Boris Ostrovsky, Juergen Gross, Stefano Stabellini
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-pci, xen-devel,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/xen/xen-pciback/conf_space.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
index 059de92aea7d..0e7577f16f78 100644
--- a/drivers/xen/xen-pciback/conf_space.c
+++ b/drivers/xen/xen-pciback/conf_space.c
@@ -130,7 +130,7 @@ static inline u32 merge_value(u32 val, u32 new_val, u32 new_val_mask,
 static int xen_pcibios_err_to_errno(int err)
 {
 	switch (err) {
-	case PCIBIOS_SUCCESSFUL:
+	case 0:
 		return XEN_PCI_ERR_success;
 	case PCIBIOS_DEVICE_NOT_FOUND:
 		return XEN_PCI_ERR_dev_not_found;
-- 
2.18.2

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Linux-kernel-mentees@lists.linuxfoundation.org
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 01/35] xen-pciback: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 17:16   ` Larry Finger
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 03/35] scsi: ipr: " Saheed O. Bolarinwa
                   ` (34 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Michael Buesch
  Cc: Saheed O. Bolarinwa, linux-wireless, linux-kernel, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/ssb/driver_gige.c    | 4 ++--
 drivers/ssb/driver_pcicore.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/ssb/driver_gige.c b/drivers/ssb/driver_gige.c
index ebee6b0e3c34..ccb4a35715bf 100644
--- a/drivers/ssb/driver_gige.c
+++ b/drivers/ssb/driver_gige.c
@@ -134,7 +134,7 @@ static int ssb_gige_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 	}
 	spin_unlock_irqrestore(&dev->lock, flags);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int ssb_gige_pci_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -164,7 +164,7 @@ static int ssb_gige_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 	}
 	spin_unlock_irqrestore(&dev->lock, flags);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int ssb_gige_probe(struct ssb_device *sdev,
diff --git a/drivers/ssb/driver_pcicore.c b/drivers/ssb/driver_pcicore.c
index c1186415896b..1b67af1097c8 100644
--- a/drivers/ssb/driver_pcicore.c
+++ b/drivers/ssb/driver_pcicore.c
@@ -212,7 +212,7 @@ static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
 				     PCI_FUNC(devfn), reg, val, size);
 	spin_unlock_irqrestore(&cfgspace_lock, flags);
 
-	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return err ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -226,7 +226,7 @@ static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
 				      PCI_FUNC(devfn), reg, &val, size);
 	spin_unlock_irqrestore(&cfgspace_lock, flags);
 
-	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return err ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static struct pci_ops ssb_pcicore_pciops = {
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 03/35] scsi: ipr: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 01/35] xen-pciback: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: " Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 04/35] scsi: ipr: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (33 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Brian King, James E.J. Bottomley, Martin K. Petersen
  Cc: linux-scsi, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/scsi/ipr.c     | 16 ++++++++--------
 drivers/scsi/pmcraid.c |  6 +++---
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 7d86f4ca266c..b6c52a04cf52 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -775,7 +775,7 @@ static int ipr_save_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
 		return 0;
 
 	if (pci_read_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
-				 &ioa_cfg->saved_pcix_cmd_reg) != PCIBIOS_SUCCESSFUL) {
+				 &ioa_cfg->saved_pcix_cmd_reg) != 0) {
 		dev_err(&ioa_cfg->pdev->dev, "Failed to save PCI-X command register\n");
 		return -EIO;
 	}
@@ -797,7 +797,7 @@ static int ipr_set_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
 
 	if (pcix_cmd_reg) {
 		if (pci_write_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
-					  ioa_cfg->saved_pcix_cmd_reg) != PCIBIOS_SUCCESSFUL) {
+					  ioa_cfg->saved_pcix_cmd_reg) != 0) {
 			dev_err(&ioa_cfg->pdev->dev, "Failed to setup PCI-X command register\n");
 			return -EIO;
 		}
@@ -8739,7 +8739,7 @@ static int ipr_reset_bist_done(struct ipr_cmnd *ipr_cmd)
 static int ipr_reset_start_bist(struct ipr_cmnd *ipr_cmd)
 {
 	struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
-	int rc = PCIBIOS_SUCCESSFUL;
+	int rc = 0;
 
 	ENTER;
 	if (ioa_cfg->ipr_chip->bist_method == IPR_MMIO)
@@ -8748,7 +8748,7 @@ static int ipr_reset_start_bist(struct ipr_cmnd *ipr_cmd)
 	else
 		rc = pci_write_config_byte(ioa_cfg->pdev, PCI_BIST, PCI_BIST_START);
 
-	if (rc == PCIBIOS_SUCCESSFUL) {
+	if (rc == 0) {
 		ipr_cmd->job_step = ipr_reset_bist_done;
 		ipr_reset_start_timer(ipr_cmd, IPR_WAIT_FOR_BIST_TIMEOUT);
 		rc = IPR_RC_JOB_RETURN;
@@ -8946,7 +8946,7 @@ static int ipr_reset_alert(struct ipr_cmnd *ipr_cmd)
 	ENTER;
 	rc = pci_read_config_word(ioa_cfg->pdev, PCI_COMMAND, &cmd_reg);
 
-	if ((rc == PCIBIOS_SUCCESSFUL) && (cmd_reg & PCI_COMMAND_MEMORY)) {
+	if ((rc == 0) && (cmd_reg & PCI_COMMAND_MEMORY)) {
 		ipr_mask_and_clear_interrupts(ioa_cfg, ~0);
 		writel(IPR_UPROCI_RESET_ALERT, ioa_cfg->regs.set_uproc_interrupt_reg32);
 		ipr_cmd->job_step = ipr_reset_wait_to_start_bist;
@@ -10154,7 +10154,7 @@ static int ipr_probe_ioa(struct pci_dev *pdev,
 	struct Scsi_Host *host;
 	unsigned long ipr_regs_pci;
 	void __iomem *ipr_regs;
-	int rc = PCIBIOS_SUCCESSFUL;
+	int rc = 0;
 	volatile u32 mask, uproc, interrupts;
 	unsigned long lock_flags, driver_lock_flags;
 	unsigned int irq_flag;
@@ -10256,7 +10256,7 @@ static int ipr_probe_ioa(struct pci_dev *pdev,
 	rc = pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
 				   ioa_cfg->chip_cfg->cache_line_size);
 
-	if (rc != PCIBIOS_SUCCESSFUL) {
+	if (rc != 0) {
 		dev_err(&pdev->dev, "Write of cache line size failed\n");
 		ipr_wait_for_pci_err_recovery(ioa_cfg);
 		rc = -EIO;
@@ -10337,7 +10337,7 @@ static int ipr_probe_ioa(struct pci_dev *pdev,
 	/* Save away PCI config space for use following IOA reset */
 	rc = pci_save_state(pdev);
 
-	if (rc != PCIBIOS_SUCCESSFUL) {
+	if (rc != 0) {
 		dev_err(&pdev->dev, "Failed to save PCI config space\n");
 		rc = -EIO;
 		goto cleanup_nolog;
diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index aa9ae2ae8579..5f6e440f0dcd 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -553,7 +553,7 @@ static void pmcraid_bist_done(struct timer_list *t)
 	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
 
 	/* If PCI config space can't be accessed wait for another two secs */
-	if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
+	if ((rc != 0 || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
 	    cmd->time_left > 0) {
 		pmcraid_info("BIST not complete, waiting another 2 secs\n");
 		cmd->timer.expires = jiffies + cmd->time_left;
@@ -649,7 +649,7 @@ static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
 	 * BIST or slot_reset
 	 */
 	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
-	if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
+	if ((rc == 0) && (pci_reg & PCI_COMMAND_MEMORY)) {
 
 		/* wait for IOA permission i.e until CRITICAL_OPERATION bit is
 		 * reset IOA doesn't generate any interrupts when CRITICAL
@@ -5651,7 +5651,7 @@ static int pmcraid_probe(struct pci_dev *pdev,
 	struct pmcraid_instance *pinstance;
 	struct Scsi_Host *host;
 	void __iomem *mapped_pci_addr;
-	int rc = PCIBIOS_SUCCESSFUL;
+	int rc = 0;
 
 	if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
 		pmcraid_err
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 04/35] scsi: ipr: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (2 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 03/35] scsi: ipr: " Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 05/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (32 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Brian King, James E.J. Bottomley, Martin K. Petersen
  Cc: linux-scsi, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 03/35

 drivers/scsi/ipr.c     | 12 ++++++------
 drivers/scsi/pmcraid.c |  4 ++--
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index b6c52a04cf52..e714f82769bc 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -775,7 +775,7 @@ static int ipr_save_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
 		return 0;
 
 	if (pci_read_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
-				 &ioa_cfg->saved_pcix_cmd_reg) != 0) {
+				 &ioa_cfg->saved_pcix_cmd_reg)) {
 		dev_err(&ioa_cfg->pdev->dev, "Failed to save PCI-X command register\n");
 		return -EIO;
 	}
@@ -797,7 +797,7 @@ static int ipr_set_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
 
 	if (pcix_cmd_reg) {
 		if (pci_write_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
-					  ioa_cfg->saved_pcix_cmd_reg) != 0) {
+					  ioa_cfg->saved_pcix_cmd_reg)) {
 			dev_err(&ioa_cfg->pdev->dev, "Failed to setup PCI-X command register\n");
 			return -EIO;
 		}
@@ -8748,7 +8748,7 @@ static int ipr_reset_start_bist(struct ipr_cmnd *ipr_cmd)
 	else
 		rc = pci_write_config_byte(ioa_cfg->pdev, PCI_BIST, PCI_BIST_START);
 
-	if (rc == 0) {
+	if (!rc) {
 		ipr_cmd->job_step = ipr_reset_bist_done;
 		ipr_reset_start_timer(ipr_cmd, IPR_WAIT_FOR_BIST_TIMEOUT);
 		rc = IPR_RC_JOB_RETURN;
@@ -8946,7 +8946,7 @@ static int ipr_reset_alert(struct ipr_cmnd *ipr_cmd)
 	ENTER;
 	rc = pci_read_config_word(ioa_cfg->pdev, PCI_COMMAND, &cmd_reg);
 
-	if ((rc == 0) && (cmd_reg & PCI_COMMAND_MEMORY)) {
+	if ((!rc) && (cmd_reg & PCI_COMMAND_MEMORY)) {
 		ipr_mask_and_clear_interrupts(ioa_cfg, ~0);
 		writel(IPR_UPROCI_RESET_ALERT, ioa_cfg->regs.set_uproc_interrupt_reg32);
 		ipr_cmd->job_step = ipr_reset_wait_to_start_bist;
@@ -10256,7 +10256,7 @@ static int ipr_probe_ioa(struct pci_dev *pdev,
 	rc = pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
 				   ioa_cfg->chip_cfg->cache_line_size);
 
-	if (rc != 0) {
+	if (rc) {
 		dev_err(&pdev->dev, "Write of cache line size failed\n");
 		ipr_wait_for_pci_err_recovery(ioa_cfg);
 		rc = -EIO;
@@ -10337,7 +10337,7 @@ static int ipr_probe_ioa(struct pci_dev *pdev,
 	/* Save away PCI config space for use following IOA reset */
 	rc = pci_save_state(pdev);
 
-	if (rc != 0) {
+	if (rc) {
 		dev_err(&pdev->dev, "Failed to save PCI config space\n");
 		rc = -EIO;
 		goto cleanup_nolog;
diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index 5f6e440f0dcd..151aa61b674b 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -553,7 +553,7 @@ static void pmcraid_bist_done(struct timer_list *t)
 	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
 
 	/* If PCI config space can't be accessed wait for another two secs */
-	if ((rc != 0 || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
+	if ((rc || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
 	    cmd->time_left > 0) {
 		pmcraid_info("BIST not complete, waiting another 2 secs\n");
 		cmd->timer.expires = jiffies + cmd->time_left;
@@ -649,7 +649,7 @@ static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
 	 * BIST or slot_reset
 	 */
 	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
-	if ((rc == 0) && (pci_reg & PCI_COMMAND_MEMORY)) {
+	if ((!rc) && (pci_reg & PCI_COMMAND_MEMORY)) {
 
 		/* wait for IOA permission i.e until CRITICAL_OPERATION bit is
 		 * reset IOA doesn't generate any interrupts when CRITICAL
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 05/35] PCI: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (3 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 04/35] scsi: ipr: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 06/35] PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (31 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Yue Wang, Lorenzo Pieralisi, Rob Herring, Bjorn Helgaas,
	Kevin Hilman, Philipp Zabel, Jingoo Han, Gustavo Pimentel,
	Toan Le, Ray Jui, Scott Branden, bcm-kernel-feedback-list,
	Ley Foon Tan, Marek Vasut, Yoshihiro Shimoda
  Cc: Saheed O. Bolarinwa, linux-kernel, rfi, linux-renesas-soc,
	linux-pci, linux-amlogic, linux-kernel-mentees, linux-arm-kernel

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/pci/controller/dwc/pci-meson.c        |  4 +--
 .../pci/controller/dwc/pcie-designware-host.c |  2 +-
 drivers/pci/controller/dwc/pcie-designware.c  |  4 +--
 drivers/pci/controller/dwc/pcie-hisi.c        |  4 +--
 drivers/pci/controller/dwc/pcie-tegra194.c    |  4 +--
 .../pci/controller/mobiveil/pcie-mobiveil.c   |  4 +--
 drivers/pci/controller/pci-aardvark.c         |  4 +--
 drivers/pci/controller/pci-ftpci100.c         |  4 +--
 drivers/pci/controller/pci-hyperv.c           |  8 ++---
 drivers/pci/controller/pci-mvebu.c            |  4 +--
 drivers/pci/controller/pci-thunder-ecam.c     | 36 +++++++++----------
 drivers/pci/controller/pci-thunder-pem.c      |  4 +--
 drivers/pci/controller/pci-xgene.c            |  4 +--
 drivers/pci/controller/pcie-altera.c          | 16 ++++-----
 drivers/pci/controller/pcie-iproc.c           | 10 +++---
 drivers/pci/controller/pcie-mediatek.c        |  4 +--
 drivers/pci/controller/pcie-rcar-host.c       |  8 ++---
 drivers/pci/controller/pcie-rockchip-host.c   | 10 +++---
 18 files changed, 67 insertions(+), 67 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index ca59ba9e0ecd..58142f03d300 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -390,7 +390,7 @@ static int meson_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
 	int ret;
 
 	ret = dw_pcie_read(pci->dbi_base + where, size, val);
-	if (ret != PCIBIOS_SUCCESSFUL)
+	if (ret != 0)
 		return ret;
 
 	/*
@@ -407,7 +407,7 @@ static int meson_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
 	else if (where == PCI_CLASS_DEVICE + 1 && size == 1)
 		*val = (PCI_CLASS_BRIDGE_PCI >> 8) & 0xff;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int meson_pcie_wr_own_conf(struct pcie_port *pp, int where,
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 0a4a5aa6fe46..7c97c54f787c 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -459,7 +459,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 	}
 
 	ret = dw_pcie_rd_own_conf(pp, PCI_HEADER_TYPE, 1, &hdr_type);
-	if (ret != PCIBIOS_SUCCESSFUL) {
+	if (ret != 0) {
 		dev_err(pci->dev, "Failed reading PCI_HEADER_TYPE cfg space reg (ret: 0x%x)\n",
 			ret);
 		ret = pcibios_err_to_errno(ret);
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index c92496e36fd5..2494e1be1f96 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -113,7 +113,7 @@ int dw_pcie_read(void __iomem *addr, int size, u32 *val)
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(dw_pcie_read);
 
@@ -131,7 +131,7 @@ int dw_pcie_write(void __iomem *addr, int size, u32 val)
 	else
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(dw_pcie_write);
 
diff --git a/drivers/pci/controller/dwc/pcie-hisi.c b/drivers/pci/controller/dwc/pcie-hisi.c
index 0ad4e07dd4c2..10a46aded227 100644
--- a/drivers/pci/controller/dwc/pcie-hisi.c
+++ b/drivers/pci/controller/dwc/pcie-hisi.c
@@ -163,7 +163,7 @@ static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size,
 	else
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 /* HipXX PCIe host only supports 32-bit config access */
@@ -190,7 +190,7 @@ static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int  size,
 	} else
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int hisi_pcie_link_up_hip05(struct hisi_pcie *hisi_pcie)
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 92b77f7d8354..34fe0084a4d1 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -581,7 +581,7 @@ static int tegra_pcie_dw_rd_own_conf(struct pcie_port *pp, int where, int size,
 	 */
 	if (where == PORT_LOGIC_MSIX_DOORBELL) {
 		*val = 0x00000000;
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 
 	return dw_pcie_read(pci->dbi_base + where, size, val);
@@ -599,7 +599,7 @@ static int tegra_pcie_dw_wr_own_conf(struct pcie_port *pp, int where, int size,
 	 * So skip accessing it altogether
 	 */
 	if (where == PORT_LOGIC_MSIX_DOORBELL)
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	return dw_pcie_write(pci->dbi_base + where, size, val);
 }
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.c b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
index 62ecbaeb0a60..f9f03b022d0e 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.c
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
@@ -71,7 +71,7 @@ static int mobiveil_pcie_read(void __iomem *addr, int size, u32 *val)
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int mobiveil_pcie_write(void __iomem *addr, int size, u32 val)
@@ -93,7 +93,7 @@ static int mobiveil_pcie_write(void __iomem *addr, int size, u32 val)
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 u32 mobiveil_csr_read(struct mobiveil_pcie *pcie, u32 off, size_t size)
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 90ff291c24f0..b9a2d3359317 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -700,7 +700,7 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
 	else if (size == 2)
 		*val = (*val >> (8 * (where & 3))) & 0xffff;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int advk_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
@@ -760,7 +760,7 @@ static int advk_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 
 	advk_pcie_check_pio_status(pcie);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops advk_pcie_ops = {
diff --git a/drivers/pci/controller/pci-ftpci100.c b/drivers/pci/controller/pci-ftpci100.c
index 1b67564de7af..449187e8c298 100644
--- a/drivers/pci/controller/pci-ftpci100.c
+++ b/drivers/pci/controller/pci-ftpci100.c
@@ -204,7 +204,7 @@ static int faraday_raw_pci_read_config(struct faraday_pci *p, int bus_number,
 	else if (size == 2)
 		*value = (*value >> (8 * (config & 3))) & 0xFFFF;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int faraday_pci_read_config(struct pci_bus *bus, unsigned int fn,
@@ -223,7 +223,7 @@ static int faraday_raw_pci_write_config(struct faraday_pci *p, int bus_number,
 					 unsigned int fn, int config, int size,
 					 u32 value)
 {
-	int ret = PCIBIOS_SUCCESSFUL;
+	int ret = 0;
 
 	writel(PCI_CONF_BUS(bus_number) |
 			PCI_CONF_DEVICE(PCI_SLOT(fn)) |
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index bf40ff09c99d..b1552394e2d6 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -807,7 +807,7 @@ static void _hv_pcifront_write_config(struct hv_pci_dev *hpdev, int where,
  * @size: Byte/word/dword
  * @val: Value to be read
  *
- * Return: PCIBIOS_SUCCESSFUL on success
+ * Return: 0 on success
  *	   PCIBIOS_DEVICE_NOT_FOUND on failure
  */
 static int hv_pcifront_read_config(struct pci_bus *bus, unsigned int devfn,
@@ -824,7 +824,7 @@ static int hv_pcifront_read_config(struct pci_bus *bus, unsigned int devfn,
 	_hv_pcifront_read_config(hpdev, where, size, val);
 
 	put_pcichild(hpdev);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 /**
@@ -835,7 +835,7 @@ static int hv_pcifront_read_config(struct pci_bus *bus, unsigned int devfn,
  * @size: Byte/word/dword
  * @val: Value to be written to device
  *
- * Return: PCIBIOS_SUCCESSFUL on success
+ * Return: 0 on success
  *	   PCIBIOS_DEVICE_NOT_FOUND on failure
  */
 static int hv_pcifront_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -852,7 +852,7 @@ static int hv_pcifront_write_config(struct pci_bus *bus, unsigned int devfn,
 	_hv_pcifront_write_config(hpdev, where, size, val);
 
 	put_pcichild(hpdev);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 /* PCIe operations */
diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 153a64676bc9..30ef5ece4a3b 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -246,7 +246,7 @@ static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
@@ -272,7 +272,7 @@ static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 /*
diff --git a/drivers/pci/controller/pci-thunder-ecam.c b/drivers/pci/controller/pci-thunder-ecam.c
index 7e8835fee5f7..8e30e1f9622e 100644
--- a/drivers/pci/controller/pci-thunder-ecam.c
+++ b/drivers/pci/controller/pci-thunder-ecam.c
@@ -37,7 +37,7 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
 
 	if (where_a == 0) {
 		set_val(e0, where, size, val);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 	if (where_a == 0x4) {
 		addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
@@ -49,7 +49,7 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
 		v &= ~0xf;
 		v |= 2; /* EA entry-1. Base-L */
 		set_val(v, where, size, val);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 	if (where_a == 0x8) {
 		u32 barl_orig;
@@ -68,7 +68,7 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
 		v = ~barl_rb & ~3;
 		v |= 0xc; /* EA entry-2. Offset-L */
 		set_val(v, where, size, val);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 	if (where_a == 0xc) {
 		addr = bus->ops->map_bus(bus, devfn, bar + 4); /* BAR 1 */
@@ -78,7 +78,7 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
 		}
 		v = readl(addr); /* EA entry-3. Base-H */
 		set_val(v, where, size, val);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 	return PCIBIOS_DEVICE_NOT_FOUND;
 }
@@ -121,7 +121,7 @@ static int thunder_ecam_p2_config_read(struct pci_bus *bus, unsigned int devfn,
 	v |= node_bits;
 	set_val(v, where, size, val);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
@@ -172,7 +172,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
 	     (where >= 0x1a4 && where < 0x1bc))) {
 		/* BAR or SR-IOV BAR */
 		*val = 0;
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 
 	addr = bus->ops->map_bus(bus, devfn, 0);
@@ -207,7 +207,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
 		if (!has_msix && where_a == 0x70) {
 			v |= 0xbc00; /* next capability is EA at 0xbc */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xb0) {
 			addr = bus->ops->map_bus(bus, devfn, where_a);
@@ -220,7 +220,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
 				pr_err("Bad MSIX cap header: %08x\n", v);
 			v |= 0xbc00; /* next capability is EA at 0xbc */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xbc) {
 			if (is_nic)
@@ -232,7 +232,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
 			else
 				v = 0x10014; /* EA last in chain, 1 entry */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a >= 0xc0 && where_a < 0xd0)
 			/* EA entry-0. PP=0, BAR0 Size:3 */
@@ -277,7 +277,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
 				pr_err("Bad PCIe cap header: %08x\n", v);
 			v |= 0xbc00; /* next capability is EA at 0xbc */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xbc) {
 			if (is_nic_bridge)
@@ -285,7 +285,7 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
 			else
 				v = 0x00014; /* EA last in chain, no entries */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xc0) {
 			if (is_rsl_bridge || is_nic_bridge)
@@ -297,33 +297,33 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
 			else if (is_dfa_bridge)
 				v = 0x0404; /* subordinate:secondary = 4:4 */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xc4 && is_nic_bridge) {
 			/* Enabled, not-Write, SP=ff, PP=05, BEI=6, ES=4 */
 			v = 0x80ff0564;
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xc8 && is_nic_bridge) {
 			v = 0x00000002; /* Base-L 64-bit */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xcc && is_nic_bridge) {
 			v = 0xfffffffe; /* MaxOffset-L 64-bit */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xd0 && is_nic_bridge) {
 			v = 0x00008430; /* NIC Base-H */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		if (where_a == 0xd4 && is_nic_bridge) {
 			v = 0x0000000f; /* MaxOffset-H */
 			set_val(v, where, size, val);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 	}
 no_emulation:
@@ -340,7 +340,7 @@ static int thunder_ecam_config_write(struct pci_bus *bus, unsigned int devfn,
 	if ((where >= 0x10 && where < 0x2c) ||
 	    (where >= 0x1a4 && where < 0x1bc))
 		/* BAR or SR-IOV BAR */
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	return pci_generic_config_write(bus, devfn, where, size, val);
 }
diff --git a/drivers/pci/controller/pci-thunder-pem.c b/drivers/pci/controller/pci-thunder-pem.c
index 3f847969143e..ae747d203514 100644
--- a/drivers/pci/controller/pci-thunder-pem.c
+++ b/drivers/pci/controller/pci-thunder-pem.c
@@ -123,7 +123,7 @@ static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn,
 		break;
 	}
 	*val = read_val;
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int thunder_pem_config_read(struct pci_bus *bus, unsigned int devfn,
@@ -272,7 +272,7 @@ static int thunder_pem_bridge_write(struct pci_bus *bus, unsigned int devfn,
 	 */
 	write_val = (((u64)val) << 32) | where_aligned;
 	writeq(write_val, pem_pci->pem_reg_base + PEM_CFG_WR);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int thunder_pem_config_write(struct pci_bus *bus, unsigned int devfn,
diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c
index d1efa8ffbae1..bf74f0a8b451 100644
--- a/drivers/pci/controller/pci-xgene.c
+++ b/drivers/pci/controller/pci-xgene.c
@@ -168,7 +168,7 @@ static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
 	struct xgene_pcie_port *port = pcie_bus_to_port(bus);
 
 	if (pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val) !=
-	    PCIBIOS_SUCCESSFUL)
+	    0)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
 	/*
@@ -187,7 +187,7 @@ static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
 	if (size <= 2)
 		*val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 #endif
 
diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
index 24cb1c331058..96f5bda32b58 100644
--- a/drivers/pci/controller/pcie-altera.c
+++ b/drivers/pci/controller/pcie-altera.c
@@ -226,7 +226,7 @@ static int tlp_read_packet(struct altera_pcie *pcie, u32 *value)
 				if (value)
 					*value = reg0;
 
-				return PCIBIOS_SUCCESSFUL;
+				return 0;
 			}
 		}
 		udelay(5);
@@ -273,7 +273,7 @@ static int s10_tlp_read_packet(struct altera_pcie *pcie, u32 *value)
 			    count == 4)
 				*value = dw[3];
 
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 	}
 
@@ -367,7 +367,7 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
 						    value, false);
 
 	ret = pcie->pcie_data->ops->tlp_read_pkt(pcie, NULL);
-	if (ret != PCIBIOS_SUCCESSFUL)
+	if (ret != 0)
 		return ret;
 
 	/*
@@ -377,7 +377,7 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
 	if ((bus == pcie->root_bus_nr) && (where == PCI_PRIMARY_BUS))
 		pcie->root_bus_nr = (u8)(value);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int s10_rp_read_cfg(struct altera_pcie *pcie, int where,
@@ -397,7 +397,7 @@ static int s10_rp_read_cfg(struct altera_pcie *pcie, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int s10_rp_write_cfg(struct altera_pcie *pcie, u8 busno,
@@ -424,7 +424,7 @@ static int s10_rp_write_cfg(struct altera_pcie *pcie, u8 busno,
 	if (busno == pcie->root_bus_nr && where == PCI_PRIMARY_BUS)
 		pcie->root_bus_nr = value & 0xff;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int _altera_pcie_cfg_read(struct altera_pcie *pcie, u8 busno,
@@ -453,7 +453,7 @@ static int _altera_pcie_cfg_read(struct altera_pcie *pcie, u8 busno,
 
 	ret = tlp_cfg_dword_read(pcie, busno, devfn,
 				 (where & ~DWORD_MASK), byte_en, &data);
-	if (ret != PCIBIOS_SUCCESSFUL)
+	if (ret != 0)
 		return ret;
 
 	switch (size) {
@@ -468,7 +468,7 @@ static int _altera_pcie_cfg_read(struct altera_pcie *pcie, u8 busno,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int _altera_pcie_cfg_write(struct altera_pcie *pcie, u8 busno,
diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
index 8c7f875acf7f..dac9352c0cb2 100644
--- a/drivers/pci/controller/pcie-iproc.c
+++ b/drivers/pci/controller/pcie-iproc.c
@@ -584,7 +584,7 @@ static int iproc_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
 	/* root complex access */
 	if (busno == 0) {
 		ret = pci_generic_config_read32(bus, devfn, where, size, val);
-		if (ret == PCIBIOS_SUCCESSFUL)
+		if (ret == 0)
 			iproc_pcie_fix_cap(pcie, where, val);
 
 		return ret;
@@ -620,7 +620,7 @@ static int iproc_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
 		    (PCI_DEVICE_ID_NX2_57810 << DEVICE_ID_SHIFT))
 			return PCIBIOS_FUNC_NOT_SUPPORTED;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 /**
@@ -677,7 +677,7 @@ static int iproc_pci_raw_config_read32(struct iproc_pcie *pcie,
 	if (size <= 2)
 		*val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int iproc_pci_raw_config_write32(struct iproc_pcie *pcie,
@@ -693,7 +693,7 @@ static int iproc_pci_raw_config_write32(struct iproc_pcie *pcie,
 
 	if (size == 4) {
 		writel(val, addr);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 
 	mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));
@@ -701,7 +701,7 @@ static int iproc_pci_raw_config_write32(struct iproc_pcie *pcie,
 	tmp |= val << ((where & 0x3) * 8);
 	writel(tmp, addr);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int iproc_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index ebfa7d5a4e2d..9e8adec04ac2 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -274,7 +274,7 @@ static int mtk_pcie_check_cfg_cpld(struct mtk_pcie_port *port)
 	if (readl(port->base + PCIE_APP_TLP_REQ) & APP_CPL_STATUS)
 		return PCIBIOS_SET_FAILED;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int mtk_pcie_hw_rd_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
@@ -306,7 +306,7 @@ static int mtk_pcie_hw_rd_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
 	else if (size == 2)
 		*val = (*val >> (8 * (where & 3))) & 0xffff;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int mtk_pcie_hw_wr_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index d210a36561be..363a8630de28 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -110,7 +110,7 @@ static int rcar_pcie_config_access(struct rcar_pcie_host *host,
 			rcar_pci_write_reg(pcie, *data, PCICONF(index));
 		}
 
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 
 	if (host->root_bus_nr < 0)
@@ -146,7 +146,7 @@ static int rcar_pcie_config_access(struct rcar_pcie_host *host,
 	/* Disable the configuration access */
 	rcar_pci_write_reg(pcie, 0, PCIECCTLR);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
@@ -157,7 +157,7 @@ static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
 
 	ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
 				      bus, devfn, where, val);
-	if (ret != PCIBIOS_SUCCESSFUL) {
+	if (ret != 0) {
 		*val = 0xffffffff;
 		return ret;
 	}
@@ -184,7 +184,7 @@ static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
 
 	ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
 				      bus, devfn, where, &data);
-	if (ret != PCIBIOS_SUCCESSFUL)
+	if (ret != 0)
 		return ret;
 
 	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
diff --git a/drivers/pci/controller/pcie-rockchip-host.c b/drivers/pci/controller/pcie-rockchip-host.c
index 94af6f5828a3..6455f48d4e9c 100644
--- a/drivers/pci/controller/pcie-rockchip-host.c
+++ b/drivers/pci/controller/pcie-rockchip-host.c
@@ -125,7 +125,7 @@ static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip,
 		*val = 0;
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip,
@@ -139,7 +139,7 @@ static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip,
 
 	if (size == 4) {
 		writel(val, addr);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 
 	mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));
@@ -153,7 +153,7 @@ static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip,
 	tmp |= val << ((where & 0x3) * 8);
 	writel(tmp, addr);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip,
@@ -187,7 +187,7 @@ static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip,
 		*val = 0;
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip,
@@ -217,7 +217,7 @@ static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip,
 	else
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rockchip_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 06/35] PCI: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (4 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 05/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 13:59   ` Gustavo Pimentel
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 07/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (30 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Lorenzo Pieralisi, Rob Herring, Ley Foon Tan,
	Marek Vasut, Yoshihiro Shimoda, Ray Jui, Scott Branden,
	bcm-kernel-feedback-list, Toan Le, Jingoo Han, Gustavo Pimentel,
	Yue Wang, Kevin Hilman, Philipp Zabel
  Cc: Saheed O. Bolarinwa, linux-kernel, rfi, linux-renesas-soc,
	linux-pci, linux-amlogic, linux-kernel-mentees, linux-arm-kernel

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 05/35

 drivers/pci/controller/dwc/pci-meson.c            | 2 +-
 drivers/pci/controller/dwc/pcie-designware-host.c | 2 +-
 drivers/pci/controller/pci-xgene.c                | 3 +--
 drivers/pci/controller/pcie-altera.c              | 4 ++--
 drivers/pci/controller/pcie-iproc.c               | 2 +-
 drivers/pci/controller/pcie-rcar-host.c           | 4 ++--
 6 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 58142f03d300..8203d5f95d28 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -390,7 +390,7 @@ static int meson_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
 	int ret;
 
 	ret = dw_pcie_read(pci->dbi_base + where, size, val);
-	if (ret != 0)
+	if (ret)
 		return ret;
 
 	/*
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 7c97c54f787c..2dd3965365f6 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -459,7 +459,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 	}
 
 	ret = dw_pcie_rd_own_conf(pp, PCI_HEADER_TYPE, 1, &hdr_type);
-	if (ret != 0) {
+	if (ret) {
 		dev_err(pci->dev, "Failed reading PCI_HEADER_TYPE cfg space reg (ret: 0x%x)\n",
 			ret);
 		ret = pcibios_err_to_errno(ret);
diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c
index bf74f0a8b451..8d55cfc4ff8a 100644
--- a/drivers/pci/controller/pci-xgene.c
+++ b/drivers/pci/controller/pci-xgene.c
@@ -167,8 +167,7 @@ static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
 {
 	struct xgene_pcie_port *port = pcie_bus_to_port(bus);
 
-	if (pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val) !=
-	    0)
+	if (pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
 	/*
diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
index 96f5bda32b58..9f7b12ad0c04 100644
--- a/drivers/pci/controller/pcie-altera.c
+++ b/drivers/pci/controller/pcie-altera.c
@@ -367,7 +367,7 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
 						    value, false);
 
 	ret = pcie->pcie_data->ops->tlp_read_pkt(pcie, NULL);
-	if (ret != 0)
+	if (ret)
 		return ret;
 
 	/*
@@ -453,7 +453,7 @@ static int _altera_pcie_cfg_read(struct altera_pcie *pcie, u8 busno,
 
 	ret = tlp_cfg_dword_read(pcie, busno, devfn,
 				 (where & ~DWORD_MASK), byte_en, &data);
-	if (ret != 0)
+	if (ret)
 		return ret;
 
 	switch (size) {
diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
index dac9352c0cb2..d34c9457fbe4 100644
--- a/drivers/pci/controller/pcie-iproc.c
+++ b/drivers/pci/controller/pcie-iproc.c
@@ -584,7 +584,7 @@ static int iproc_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
 	/* root complex access */
 	if (busno == 0) {
 		ret = pci_generic_config_read32(bus, devfn, where, size, val);
-		if (ret == 0)
+		if (!ret)
 			iproc_pcie_fix_cap(pcie, where, val);
 
 		return ret;
diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index 363a8630de28..2bb250c6f767 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -157,7 +157,7 @@ static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
 
 	ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
 				      bus, devfn, where, val);
-	if (ret != 0) {
+	if (ret) {
 		*val = 0xffffffff;
 		return ret;
 	}
@@ -184,7 +184,7 @@ static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
 
 	ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
 				      bus, devfn, where, &data);
-	if (ret != 0)
+	if (ret)
 		return ret;
 
 	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
-- 
2.18.2

_______________________________________________
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Linux-kernel-mentees@lists.linuxfoundation.org
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 07/35] PCI: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (5 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 06/35] PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 08/35] PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (29 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-pci, linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/pci/access.c               | 14 +++++++-------
 drivers/pci/pci-bridge-emul.c      | 14 +++++++-------
 drivers/pci/pci.c                  |  8 ++++----
 drivers/pci/pcie/bw_notification.c |  4 ++--
 drivers/pci/probe.c                |  4 ++--
 drivers/pci/quirks.c               |  2 +-
 drivers/pci/syscall.c              |  8 ++++----
 drivers/pci/xen-pcifront.c         |  2 +-
 8 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 79c4a2ef269a..b907abe38679 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -92,7 +92,7 @@ int pci_generic_config_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = readl(addr);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(pci_generic_config_read);
 
@@ -112,7 +112,7 @@ int pci_generic_config_write(struct pci_bus *bus, unsigned int devfn,
 	else
 		writel(val, addr);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(pci_generic_config_write);
 
@@ -132,7 +132,7 @@ int pci_generic_config_read32(struct pci_bus *bus, unsigned int devfn,
 	if (size <= 2)
 		*val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(pci_generic_config_read32);
 
@@ -148,7 +148,7 @@ int pci_generic_config_write32(struct pci_bus *bus, unsigned int devfn,
 
 	if (size == 4) {
 		writel(val, addr);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 
 	/*
@@ -169,7 +169,7 @@ int pci_generic_config_write32(struct pci_bus *bus, unsigned int devfn,
 	tmp |= val << ((where & 0x3) * 8);
 	writel(tmp, addr);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(pci_generic_config_write32);
 
@@ -222,7 +222,7 @@ static noinline void pci_wait_cfg(struct pci_dev *dev)
 int pci_user_read_config_##size						\
 	(struct pci_dev *dev, int pos, type *val)			\
 {									\
-	int ret = PCIBIOS_SUCCESSFUL;					\
+	int ret = 0;					\
 	u32 data = -1;							\
 	if (PCI_##size##_BAD)						\
 		return -EINVAL;						\
@@ -242,7 +242,7 @@ EXPORT_SYMBOL_GPL(pci_user_read_config_##size);
 int pci_user_write_config_##size					\
 	(struct pci_dev *dev, int pos, type val)			\
 {									\
-	int ret = PCIBIOS_SUCCESSFUL;					\
+	int ret = 0;					\
 	if (PCI_##size##_BAD)						\
 		return -EINVAL;						\
 	raw_spin_lock_irq(&pci_lock);				\
diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c
index ccf26d12ec61..9695c453e197 100644
--- a/drivers/pci/pci-bridge-emul.c
+++ b/drivers/pci/pci-bridge-emul.c
@@ -323,12 +323,12 @@ int pci_bridge_emul_conf_read(struct pci_bridge_emul *bridge, int where,
 
 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_END) {
 		*value = 0;
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 
 	if (!bridge->has_pcie && reg >= PCI_BRIDGE_CONF_END) {
 		*value = 0;
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 
 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_START) {
@@ -364,7 +364,7 @@ int pci_bridge_emul_conf_read(struct pci_bridge_emul *bridge, int where,
 	else if (size != 4)
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 /*
@@ -383,10 +383,10 @@ int pci_bridge_emul_conf_write(struct pci_bridge_emul *bridge, int where,
 	const struct pci_bridge_reg_behavior *behavior;
 
 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_END)
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	if (!bridge->has_pcie && reg >= PCI_BRIDGE_CONF_END)
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	shift = (where & 0x3) * 8;
 
@@ -400,7 +400,7 @@ int pci_bridge_emul_conf_write(struct pci_bridge_emul *bridge, int where,
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
 	ret = pci_bridge_emul_conf_read(bridge, reg, 4, &old);
-	if (ret != PCIBIOS_SUCCESSFUL)
+	if (ret != 0)
 		return ret;
 
 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_START) {
@@ -428,5 +428,5 @@ int pci_bridge_emul_conf_write(struct pci_bridge_emul *bridge, int where,
 	if (write_op)
 		write_op(bridge, reg, old, new, mask);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index ce096272f52b..a74547861d5e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -185,7 +185,7 @@ int pci_status_get_and_clear_errors(struct pci_dev *pdev)
 	int ret;
 
 	ret = pci_read_config_word(pdev, PCI_STATUS, &status);
-	if (ret != PCIBIOS_SUCCESSFUL)
+	if (ret != 0)
 		return -EIO;
 
 	status &= PCI_STATUS_ERROR_BITS;
@@ -534,7 +534,7 @@ int pci_find_next_ext_capability(struct pci_dev *dev, int start, int cap)
 	if (start)
 		pos = start;
 
-	if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
+	if (pci_read_config_dword(dev, pos, &header) != 0)
 		return 0;
 
 	/*
@@ -552,7 +552,7 @@ int pci_find_next_ext_capability(struct pci_dev *dev, int start, int cap)
 		if (pos < PCI_CFG_SPACE_SIZE)
 			break;
 
-		if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
+		if (pci_read_config_dword(dev, pos, &header) != 0)
 			break;
 	}
 
@@ -628,7 +628,7 @@ static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap)
 				      PCI_CAP_ID_HT, &ttl);
 	while (pos) {
 		rc = pci_read_config_byte(dev, pos + 3, &cap);
-		if (rc != PCIBIOS_SUCCESSFUL)
+		if (rc != 0)
 			return 0;
 
 		if ((cap & mask) == ht_cap)
diff --git a/drivers/pci/pcie/bw_notification.c b/drivers/pci/pcie/bw_notification.c
index 77e685771487..c7201d886026 100644
--- a/drivers/pci/pcie/bw_notification.c
+++ b/drivers/pci/pcie/bw_notification.c
@@ -23,7 +23,7 @@ static bool pcie_link_bandwidth_notification_supported(struct pci_dev *dev)
 	u32 lnk_cap;
 
 	ret = pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnk_cap);
-	return (ret == PCIBIOS_SUCCESSFUL) && (lnk_cap & PCI_EXP_LNKCAP_LBNC);
+	return (ret == 0) && (lnk_cap & PCI_EXP_LNKCAP_LBNC);
 }
 
 static void pcie_enable_link_bandwidth_notification(struct pci_dev *dev)
@@ -56,7 +56,7 @@ static irqreturn_t pcie_bw_notification_irq(int irq, void *context)
 	ret = pcie_capability_read_word(port, PCI_EXP_LNKSTA, &link_status);
 	events = link_status & PCI_EXP_LNKSTA_LBMS;
 
-	if (ret != PCIBIOS_SUCCESSFUL || !events)
+	if (ret != 0 || !events)
 		return IRQ_NONE;
 
 	pcie_capability_write_word(port, PCI_EXP_LNKSTA, events);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 2f66988cea25..ab7e19882b30 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1582,7 +1582,7 @@ static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
 
 	for (pos = PCI_CFG_SPACE_SIZE;
 	     pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) {
-		if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL
+		if (pci_read_config_dword(dev, pos, &tmp) != 0
 		    || header != tmp)
 			return false;
 	}
@@ -1609,7 +1609,7 @@ static int pci_cfg_space_size_ext(struct pci_dev *dev)
 	u32 status;
 	int pos = PCI_CFG_SPACE_SIZE;
 
-	if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
+	if (pci_read_config_dword(dev, pos, &status) != 0)
 		return PCI_CFG_SPACE_SIZE;
 	if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
 		return PCI_CFG_SPACE_SIZE;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 812bfc32ecb8..e60ef8abd698 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5117,7 +5117,7 @@ static void quirk_intel_qat_vf_cap(struct pci_dev *pdev)
 
 		pdev->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
 		if (pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status) !=
-		    PCIBIOS_SUCCESSFUL || (status == 0xffffffff))
+		    0 || (status == 0xffffffff))
 			pdev->cfg_size = PCI_CFG_SPACE_SIZE;
 
 		if (pci_find_saved_cap(pdev, PCI_CAP_ID_EXP))
diff --git a/drivers/pci/syscall.c b/drivers/pci/syscall.c
index 31e39558d49d..7d45b58beacd 100644
--- a/drivers/pci/syscall.c
+++ b/drivers/pci/syscall.c
@@ -46,7 +46,7 @@ SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
 	}
 
 	err = -EIO;
-	if (cfg_ret != PCIBIOS_SUCCESSFUL)
+	if (cfg_ret != 0)
 		goto error;
 
 	switch (len) {
@@ -105,7 +105,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
 		if (err)
 			break;
 		err = pci_user_write_config_byte(dev, off, byte);
-		if (err != PCIBIOS_SUCCESSFUL)
+		if (err != 0)
 			err = -EIO;
 		break;
 
@@ -114,7 +114,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
 		if (err)
 			break;
 		err = pci_user_write_config_word(dev, off, word);
-		if (err != PCIBIOS_SUCCESSFUL)
+		if (err != 0)
 			err = -EIO;
 		break;
 
@@ -123,7 +123,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
 		if (err)
 			break;
 		err = pci_user_write_config_dword(dev, off, dword);
-		if (err != PCIBIOS_SUCCESSFUL)
+		if (err != 0)
 			err = -EIO;
 		break;
 
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index fab267e359e7..f63623b683ad 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -81,7 +81,7 @@ static int errno_to_pcibios_err(int errno)
 {
 	switch (errno) {
 	case XEN_PCI_ERR_success:
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	case XEN_PCI_ERR_dev_not_found:
 		return PCIBIOS_DEVICE_NOT_FOUND;
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 08/35] PCI: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (6 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 07/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 09/35] nvme-pci: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (28 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-pci, linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 07/35

 drivers/pci/pci-bridge-emul.c      | 2 +-
 drivers/pci/pci.c                  | 8 ++++----
 drivers/pci/pcie/bw_notification.c | 4 ++--
 drivers/pci/probe.c                | 4 ++--
 drivers/pci/quirks.c               | 4 ++--
 drivers/pci/syscall.c              | 8 ++++----
 6 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c
index 9695c453e197..c270c18d5cf5 100644
--- a/drivers/pci/pci-bridge-emul.c
+++ b/drivers/pci/pci-bridge-emul.c
@@ -400,7 +400,7 @@ int pci_bridge_emul_conf_write(struct pci_bridge_emul *bridge, int where,
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
 	ret = pci_bridge_emul_conf_read(bridge, reg, 4, &old);
-	if (ret != 0)
+	if (ret)
 		return ret;
 
 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_START) {
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a74547861d5e..4b2a348576cb 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -185,7 +185,7 @@ int pci_status_get_and_clear_errors(struct pci_dev *pdev)
 	int ret;
 
 	ret = pci_read_config_word(pdev, PCI_STATUS, &status);
-	if (ret != 0)
+	if (ret)
 		return -EIO;
 
 	status &= PCI_STATUS_ERROR_BITS;
@@ -534,7 +534,7 @@ int pci_find_next_ext_capability(struct pci_dev *dev, int start, int cap)
 	if (start)
 		pos = start;
 
-	if (pci_read_config_dword(dev, pos, &header) != 0)
+	if (pci_read_config_dword(dev, pos, &header))
 		return 0;
 
 	/*
@@ -552,7 +552,7 @@ int pci_find_next_ext_capability(struct pci_dev *dev, int start, int cap)
 		if (pos < PCI_CFG_SPACE_SIZE)
 			break;
 
-		if (pci_read_config_dword(dev, pos, &header) != 0)
+		if (pci_read_config_dword(dev, pos, &header))
 			break;
 	}
 
@@ -628,7 +628,7 @@ static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap)
 				      PCI_CAP_ID_HT, &ttl);
 	while (pos) {
 		rc = pci_read_config_byte(dev, pos + 3, &cap);
-		if (rc != 0)
+		if (rc)
 			return 0;
 
 		if ((cap & mask) == ht_cap)
diff --git a/drivers/pci/pcie/bw_notification.c b/drivers/pci/pcie/bw_notification.c
index c7201d886026..f62c19ffedfc 100644
--- a/drivers/pci/pcie/bw_notification.c
+++ b/drivers/pci/pcie/bw_notification.c
@@ -23,7 +23,7 @@ static bool pcie_link_bandwidth_notification_supported(struct pci_dev *dev)
 	u32 lnk_cap;
 
 	ret = pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnk_cap);
-	return (ret == 0) && (lnk_cap & PCI_EXP_LNKCAP_LBNC);
+	return (!ret) && (lnk_cap & PCI_EXP_LNKCAP_LBNC);
 }
 
 static void pcie_enable_link_bandwidth_notification(struct pci_dev *dev)
@@ -56,7 +56,7 @@ static irqreturn_t pcie_bw_notification_irq(int irq, void *context)
 	ret = pcie_capability_read_word(port, PCI_EXP_LNKSTA, &link_status);
 	events = link_status & PCI_EXP_LNKSTA_LBMS;
 
-	if (ret != 0 || !events)
+	if (ret || !events)
 		return IRQ_NONE;
 
 	pcie_capability_write_word(port, PCI_EXP_LNKSTA, events);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ab7e19882b30..60ecebbc7dcf 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1582,7 +1582,7 @@ static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
 
 	for (pos = PCI_CFG_SPACE_SIZE;
 	     pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) {
-		if (pci_read_config_dword(dev, pos, &tmp) != 0
+		if (pci_read_config_dword(dev, pos, &tmp)
 		    || header != tmp)
 			return false;
 	}
@@ -1609,7 +1609,7 @@ static int pci_cfg_space_size_ext(struct pci_dev *dev)
 	u32 status;
 	int pos = PCI_CFG_SPACE_SIZE;
 
-	if (pci_read_config_dword(dev, pos, &status) != 0)
+	if (pci_read_config_dword(dev, pos, &status))
 		return PCI_CFG_SPACE_SIZE;
 	if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
 		return PCI_CFG_SPACE_SIZE;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index e60ef8abd698..8b69d6ebb619 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5116,8 +5116,8 @@ static void quirk_intel_qat_vf_cap(struct pci_dev *pdev)
 		pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
 
 		pdev->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
-		if (pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status) !=
-		    0 || (status == 0xffffffff))
+		if (pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status)
+		     || (status == 0xffffffff))
 			pdev->cfg_size = PCI_CFG_SPACE_SIZE;
 
 		if (pci_find_saved_cap(pdev, PCI_CAP_ID_EXP))
diff --git a/drivers/pci/syscall.c b/drivers/pci/syscall.c
index 7d45b58beacd..a208700000ea 100644
--- a/drivers/pci/syscall.c
+++ b/drivers/pci/syscall.c
@@ -46,7 +46,7 @@ SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
 	}
 
 	err = -EIO;
-	if (cfg_ret != 0)
+	if (cfg_ret)
 		goto error;
 
 	switch (len) {
@@ -105,7 +105,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
 		if (err)
 			break;
 		err = pci_user_write_config_byte(dev, off, byte);
-		if (err != 0)
+		if (err)
 			err = -EIO;
 		break;
 
@@ -114,7 +114,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
 		if (err)
 			break;
 		err = pci_user_write_config_word(dev, off, word);
-		if (err != 0)
+		if (err)
 			err = -EIO;
 		break;
 
@@ -123,7 +123,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
 		if (err)
 			break;
 		err = pci_user_write_config_dword(dev, off, dword);
-		if (err != 0)
+		if (err)
 			err = -EIO;
 		break;
 
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 09/35] nvme-pci: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (7 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 08/35] PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 16:42   ` Rajashekar, Revanth
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 10/35] nvme-pci: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (27 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Keith Busch, Jens Axboe, Christoph Hellwig, Sagi Grimberg
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-nvme, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/nvme/host/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index b1d18f0633c7..d426efb53f44 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1185,7 +1185,7 @@ static void nvme_warn_reset(struct nvme_dev *dev, u32 csts)
 
 	result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS,
 				      &pci_status);
-	if (result == PCIBIOS_SUCCESSFUL)
+	if (result == 0)
 		dev_warn(dev->ctrl.device,
 			 "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n",
 			 csts, pci_status);
-- 
2.18.2

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https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 10/35] nvme-pci: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (8 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 09/35] nvme-pci: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 11/35] r8169: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (26 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Keith Busch, Jens Axboe, Christoph Hellwig, Sagi Grimberg
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-nvme, linux-pci,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 09/35

 drivers/nvme/host/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index d426efb53f44..a04f2d0375de 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1185,7 +1185,7 @@ static void nvme_warn_reset(struct nvme_dev *dev, u32 csts)
 
 	result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS,
 				      &pci_status);
-	if (result == 0)
+	if (!result)
 		dev_warn(dev->ctrl.device,
 			 "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n",
 			 csts, pci_status);
-- 
2.18.2

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https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 11/35] r8169: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (9 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 10/35] nvme-pci: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 12/35] r8169: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (25 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Realtek linux nic maintainers, Heiner Kallweit,
	David S. Miller, Jakub Kicinski, Russell King
  Cc: Saheed O. Bolarinwa, linux-kernel, netdev, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index b660ddbe4025..206dac958cb2 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -2656,7 +2656,7 @@ static void rtl_csi_access_enable(struct rtl8169_private *tp, u8 val)
 	 * first and if it fails fall back to CSI.
 	 */
 	if (pdev->cfg_size > 0x070f &&
-	    pci_write_config_byte(pdev, 0x070f, val) == PCIBIOS_SUCCESSFUL)
+	    pci_write_config_byte(pdev, 0x070f, val) == 0)
 		return;
 
 	netdev_notice_once(tp->dev,
-- 
2.18.2

_______________________________________________
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 12/35] r8169: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (10 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 11/35] r8169: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 13:45   ` Heiner Kallweit
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 13/35] cxl: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (24 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Realtek linux nic maintainers, Heiner Kallweit,
	David S. Miller, Jakub Kicinski, Russell King
  Cc: Saheed O. Bolarinwa, linux-kernel, netdev, linux-pci,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 11/35

 drivers/net/ethernet/realtek/r8169_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 206dac958cb2..79edbc0c4476 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -2656,7 +2656,7 @@ static void rtl_csi_access_enable(struct rtl8169_private *tp, u8 val)
 	 * first and if it fails fall back to CSI.
 	 */
 	if (pdev->cfg_size > 0x070f &&
-	    pci_write_config_byte(pdev, 0x070f, val) == 0)
+	    !pci_write_config_byte(pdev, 0x070f, val))
 		return;
 
 	netdev_notice_once(tp->dev,
-- 
2.18.2

_______________________________________________
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https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 13/35] cxl: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (11 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 12/35] r8169: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 14/35] i2c/busses: " Saheed O. Bolarinwa
                   ` (23 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Frederic Barrat, Andrew Donnellan, Arnd Bergmann,
	Greg Kroah-Hartman
  Cc: linuxppc-dev, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
There scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/misc/cxl/vphb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
index 1cf320e2a415..1264253cc07b 100644
--- a/drivers/misc/cxl/vphb.c
+++ b/drivers/misc/cxl/vphb.c
@@ -150,7 +150,7 @@ static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
 
 out:
 	cxl_afu_configured_put(afu);
-	return rc ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return rc ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -184,7 +184,7 @@ static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
 
 out:
 	cxl_afu_configured_put(afu);
-	return rc ? PCIBIOS_SET_FAILED : PCIBIOS_SUCCESSFUL;
+	return rc ? PCIBIOS_SET_FAILED : 0;
 }
 
 static struct pci_ops cxl_pcie_pci_ops =
-- 
2.18.2

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https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 14/35] i2c/busses: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (12 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 13/35] cxl: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-17 14:58   ` Jean Delvare
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 15/35] i2c/busses: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (22 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Jean Delvare
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-i2c, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/i2c/busses/i2c-ali15x3.c |  4 ++--
 drivers/i2c/busses/i2c-nforce2.c |  2 +-
 drivers/i2c/busses/i2c-sis5595.c | 10 +++++-----
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-ali15x3.c b/drivers/i2c/busses/i2c-ali15x3.c
index 02185a1cfa77..359ee3e0864a 100644
--- a/drivers/i2c/busses/i2c-ali15x3.c
+++ b/drivers/i2c/busses/i2c-ali15x3.c
@@ -167,11 +167,11 @@ static int ali15x3_setup(struct pci_dev *ALI15X3_dev)
 	if(force_addr) {
 		dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n",
 			ali15x3_smba);
-		if (PCIBIOS_SUCCESSFUL != pci_write_config_word(ALI15X3_dev,
+		if (0 != pci_write_config_word(ALI15X3_dev,
 								SMBBA,
 								ali15x3_smba))
 			goto error;
-		if (PCIBIOS_SUCCESSFUL != pci_read_config_word(ALI15X3_dev,
+		if (0 != pci_read_config_word(ALI15X3_dev,
 								SMBBA, &a))
 			goto error;
 		if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) {
diff --git a/drivers/i2c/busses/i2c-nforce2.c b/drivers/i2c/busses/i2c-nforce2.c
index 777278386f58..385f4f446f36 100644
--- a/drivers/i2c/busses/i2c-nforce2.c
+++ b/drivers/i2c/busses/i2c-nforce2.c
@@ -328,7 +328,7 @@ static int nforce2_probe_smb(struct pci_dev *dev, int bar, int alt_reg,
 		u16 iobase;
 
 		if (pci_read_config_word(dev, alt_reg, &iobase)
-		    != PCIBIOS_SUCCESSFUL) {
+		    != 0) {
 			dev_err(&dev->dev, "Error reading PCI config for %s\n",
 				name);
 			return -EIO;
diff --git a/drivers/i2c/busses/i2c-sis5595.c b/drivers/i2c/busses/i2c-sis5595.c
index c793a5c14cda..fbe3ee31eae3 100644
--- a/drivers/i2c/busses/i2c-sis5595.c
+++ b/drivers/i2c/busses/i2c-sis5595.c
@@ -176,10 +176,10 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
 	if (force_addr) {
 		dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
 		if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
-		    != PCIBIOS_SUCCESSFUL)
+		    != 0)
 			goto error;
 		if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
-		    != PCIBIOS_SUCCESSFUL)
+		    != 0)
 			goto error;
 		if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
 			/* doesn't work for some chips! */
@@ -189,15 +189,15 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
 	}
 
 	if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
-	    != PCIBIOS_SUCCESSFUL)
+	    != 0)
 		goto error;
 	if ((val & 0x80) == 0) {
 		dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
 		if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
-		    != PCIBIOS_SUCCESSFUL)
+		    != 0)
 			goto error;
 		if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
-		    != PCIBIOS_SUCCESSFUL)
+		    != 0)
 			goto error;
 		if ((val & 0x80) == 0) {
 			/* doesn't work for some chips? */
-- 
2.18.2

_______________________________________________
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Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 15/35] i2c/busses: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (13 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 14/35] i2c/busses: " Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-17 15:11   ` Jean Delvare
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 16/35] hwmon: (sis5595) Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (21 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Jean Delvare
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-i2c, linux-pci,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 15/35

 drivers/i2c/busses/i2c-ali15x3.c |  5 ++---
 drivers/i2c/busses/i2c-nforce2.c |  3 +--
 drivers/i2c/busses/i2c-sis5595.c | 15 +++++----------
 3 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/i2c/busses/i2c-ali15x3.c b/drivers/i2c/busses/i2c-ali15x3.c
index 359ee3e0864a..c9e779cc184e 100644
--- a/drivers/i2c/busses/i2c-ali15x3.c
+++ b/drivers/i2c/busses/i2c-ali15x3.c
@@ -167,11 +167,10 @@ static int ali15x3_setup(struct pci_dev *ALI15X3_dev)
 	if(force_addr) {
 		dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n",
 			ali15x3_smba);
-		if (0 != pci_write_config_word(ALI15X3_dev,
-								SMBBA,
+		if (pci_write_config_word(ALI15X3_dev, SMBBA,
 								ali15x3_smba))
 			goto error;
-		if (0 != pci_read_config_word(ALI15X3_dev,
+		if (pci_read_config_word(ALI15X3_dev,
 								SMBBA, &a))
 			goto error;
 		if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) {
diff --git a/drivers/i2c/busses/i2c-nforce2.c b/drivers/i2c/busses/i2c-nforce2.c
index 385f4f446f36..54d2985b7aaf 100644
--- a/drivers/i2c/busses/i2c-nforce2.c
+++ b/drivers/i2c/busses/i2c-nforce2.c
@@ -327,8 +327,7 @@ static int nforce2_probe_smb(struct pci_dev *dev, int bar, int alt_reg,
 		/* Older incarnations of the device used non-standard BARs */
 		u16 iobase;
 
-		if (pci_read_config_word(dev, alt_reg, &iobase)
-		    != 0) {
+		if (pci_read_config_word(dev, alt_reg, &iobase)) {
 			dev_err(&dev->dev, "Error reading PCI config for %s\n",
 				name);
 			return -EIO;
diff --git a/drivers/i2c/busses/i2c-sis5595.c b/drivers/i2c/busses/i2c-sis5595.c
index fbe3ee31eae3..b016f48519d3 100644
--- a/drivers/i2c/busses/i2c-sis5595.c
+++ b/drivers/i2c/busses/i2c-sis5595.c
@@ -175,11 +175,9 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
 
 	if (force_addr) {
 		dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
-		if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
-		    != 0)
+		if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base))
 			goto error;
-		if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
-		    != 0)
+		if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a))
 			goto error;
 		if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
 			/* doesn't work for some chips! */
@@ -188,16 +186,13 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
 		}
 	}
 
-	if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
-	    != 0)
+	if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val))
 		goto error;
 	if ((val & 0x80) == 0) {
 		dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
-		if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
-		    != 0)
+		if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80))
 			goto error;
-		if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
-		    != 0)
+		if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val))
 			goto error;
 		if ((val & 0x80) == 0) {
 			/* doesn't work for some chips? */
-- 
2.18.2

_______________________________________________
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Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 16/35] hwmon: (sis5595) Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (14 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 15/35] i2c/busses: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-14  5:02   ` Guenter Roeck
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 17/35] hwmon: (sis5595) Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (20 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Jean Delvare, Guenter Roeck
  Cc: linux-hwmon, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/hwmon/sis5595.c | 8 ++++----
 drivers/hwmon/via686a.c | 8 ++++----
 drivers/hwmon/vt8231.c  | 8 ++++----
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
index 0c6741f949f5..0ea174fb3048 100644
--- a/drivers/hwmon/sis5595.c
+++ b/drivers/hwmon/sis5595.c
@@ -825,7 +825,7 @@ static int sis5595_pci_probe(struct pci_dev *dev,
 		pci_write_config_word(dev, SIS5595_BASE_REG, force_addr);
 	}
 
-	if (PCIBIOS_SUCCESSFUL !=
+	if (0 !=
 	    pci_read_config_word(dev, SIS5595_BASE_REG, &address)) {
 		dev_err(&dev->dev, "Failed to read ISA address\n");
 		return -ENODEV;
@@ -843,16 +843,16 @@ static int sis5595_pci_probe(struct pci_dev *dev,
 		return -ENODEV;
 	}
 
-	if (PCIBIOS_SUCCESSFUL !=
+	if (0 !=
 	    pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable)) {
 		dev_err(&dev->dev, "Failed to read enable register\n");
 		return -ENODEV;
 	}
 	if (!(enable & 0x80)) {
-		if ((PCIBIOS_SUCCESSFUL !=
+		if ((0 !=
 		     pci_write_config_byte(dev, SIS5595_ENABLE_REG,
 					   enable | 0x80))
-		 || (PCIBIOS_SUCCESSFUL !=
+		 || (0 !=
 		     pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable))
 		 || (!(enable & 0x80))) {
 			/* doesn't work for some chips! */
diff --git a/drivers/hwmon/via686a.c b/drivers/hwmon/via686a.c
index a2eddd2c2538..cffea688878f 100644
--- a/drivers/hwmon/via686a.c
+++ b/drivers/hwmon/via686a.c
@@ -863,11 +863,11 @@ static int via686a_pci_probe(struct pci_dev *dev,
 	if (force_addr) {
 		address = force_addr & ~(VIA686A_EXTENT - 1);
 		dev_warn(&dev->dev, "Forcing ISA address 0x%x\n", address);
-		if (PCIBIOS_SUCCESSFUL !=
+		if (0 !=
 		    pci_write_config_word(dev, VIA686A_BASE_REG, address | 1))
 			return -ENODEV;
 	}
-	if (PCIBIOS_SUCCESSFUL !=
+	if (0 !=
 	    pci_read_config_word(dev, VIA686A_BASE_REG, &val))
 		return -ENODEV;
 
@@ -878,7 +878,7 @@ static int via686a_pci_probe(struct pci_dev *dev,
 		return -ENODEV;
 	}
 
-	if (PCIBIOS_SUCCESSFUL !=
+	if (0 !=
 	    pci_read_config_word(dev, VIA686A_ENABLE_REG, &val))
 		return -ENODEV;
 	if (!(val & 0x0001)) {
@@ -890,7 +890,7 @@ static int via686a_pci_probe(struct pci_dev *dev,
 		}
 
 		dev_warn(&dev->dev, "Enabling sensors\n");
-		if (PCIBIOS_SUCCESSFUL !=
+		if (0 !=
 		    pci_write_config_word(dev, VIA686A_ENABLE_REG,
 					  val | 0x0001))
 			return -ENODEV;
diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c
index 2335d440f72d..cc1d24c2a2c8 100644
--- a/drivers/hwmon/vt8231.c
+++ b/drivers/hwmon/vt8231.c
@@ -987,12 +987,12 @@ static int vt8231_pci_probe(struct pci_dev *dev,
 		dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
 			 address);
 
-		if (PCIBIOS_SUCCESSFUL !=
+		if (0 !=
 		    pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
 			return -ENODEV;
 	}
 
-	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
+	if (0 != pci_read_config_word(dev, VT8231_BASE_REG,
 							&val))
 		return -ENODEV;
 
@@ -1002,13 +1002,13 @@ static int vt8231_pci_probe(struct pci_dev *dev,
 		return -ENODEV;
 	}
 
-	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
+	if (0 != pci_read_config_word(dev, VT8231_ENABLE_REG,
 							&val))
 		return -ENODEV;
 
 	if (!(val & 0x0001)) {
 		dev_warn(&dev->dev, "enabling sensors\n");
-		if (PCIBIOS_SUCCESSFUL !=
+		if (0 !=
 			pci_write_config_word(dev, VT8231_ENABLE_REG,
 							val | 0x0001))
 			return -ENODEV;
-- 
2.18.2

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 17/35] hwmon: (sis5595) Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (15 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 16/35] hwmon: (sis5595) Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-14  5:04   ` Guenter Roeck
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 18/35] bcma: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (19 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Jean Delvare, Guenter Roeck
  Cc: linux-hwmon, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 16/35

 drivers/hwmon/sis5595.c | 13 ++++---------
 drivers/hwmon/via686a.c | 13 ++++---------
 drivers/hwmon/vt8231.c  | 13 ++++---------
 3 files changed, 12 insertions(+), 27 deletions(-)

diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
index 0ea174fb3048..91fdddaa4136 100644
--- a/drivers/hwmon/sis5595.c
+++ b/drivers/hwmon/sis5595.c
@@ -825,8 +825,7 @@ static int sis5595_pci_probe(struct pci_dev *dev,
 		pci_write_config_word(dev, SIS5595_BASE_REG, force_addr);
 	}
 
-	if (0 !=
-	    pci_read_config_word(dev, SIS5595_BASE_REG, &address)) {
+	if (pci_read_config_word(dev, SIS5595_BASE_REG, &address)) {
 		dev_err(&dev->dev, "Failed to read ISA address\n");
 		return -ENODEV;
 	}
@@ -843,17 +842,13 @@ static int sis5595_pci_probe(struct pci_dev *dev,
 		return -ENODEV;
 	}
 
-	if (0 !=
-	    pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable)) {
+	if (pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable)) {
 		dev_err(&dev->dev, "Failed to read enable register\n");
 		return -ENODEV;
 	}
 	if (!(enable & 0x80)) {
-		if ((0 !=
-		     pci_write_config_byte(dev, SIS5595_ENABLE_REG,
-					   enable | 0x80))
-		 || (0 !=
-		     pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable))
+		if ((pci_write_config_byte(dev, SIS5595_ENABLE_REG, enable | 0x80))
+		 || (pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable))
 		 || (!(enable & 0x80))) {
 			/* doesn't work for some chips! */
 			dev_err(&dev->dev, "Failed to enable HWM device\n");
diff --git a/drivers/hwmon/via686a.c b/drivers/hwmon/via686a.c
index cffea688878f..b8466e2e1435 100644
--- a/drivers/hwmon/via686a.c
+++ b/drivers/hwmon/via686a.c
@@ -863,12 +863,10 @@ static int via686a_pci_probe(struct pci_dev *dev,
 	if (force_addr) {
 		address = force_addr & ~(VIA686A_EXTENT - 1);
 		dev_warn(&dev->dev, "Forcing ISA address 0x%x\n", address);
-		if (0 !=
-		    pci_write_config_word(dev, VIA686A_BASE_REG, address | 1))
+		if (pci_write_config_word(dev, VIA686A_BASE_REG, address | 1))
 			return -ENODEV;
 	}
-	if (0 !=
-	    pci_read_config_word(dev, VIA686A_BASE_REG, &val))
+	if (pci_read_config_word(dev, VIA686A_BASE_REG, &val))
 		return -ENODEV;
 
 	address = val & ~(VIA686A_EXTENT - 1);
@@ -878,8 +876,7 @@ static int via686a_pci_probe(struct pci_dev *dev,
 		return -ENODEV;
 	}
 
-	if (0 !=
-	    pci_read_config_word(dev, VIA686A_ENABLE_REG, &val))
+	if (pci_read_config_word(dev, VIA686A_ENABLE_REG, &val))
 		return -ENODEV;
 	if (!(val & 0x0001)) {
 		if (!force_addr) {
@@ -890,9 +887,7 @@ static int via686a_pci_probe(struct pci_dev *dev,
 		}
 
 		dev_warn(&dev->dev, "Enabling sensors\n");
-		if (0 !=
-		    pci_write_config_word(dev, VIA686A_ENABLE_REG,
-					  val | 0x0001))
+		if (pci_write_config_word(dev, VIA686A_ENABLE_REG, val | 0x0001))
 			return -ENODEV;
 	}
 
diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c
index cc1d24c2a2c8..ee6cd6b85f91 100644
--- a/drivers/hwmon/vt8231.c
+++ b/drivers/hwmon/vt8231.c
@@ -987,13 +987,11 @@ static int vt8231_pci_probe(struct pci_dev *dev,
 		dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
 			 address);
 
-		if (0 !=
-		    pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
+		if (pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
 			return -ENODEV;
 	}
 
-	if (0 != pci_read_config_word(dev, VT8231_BASE_REG,
-							&val))
+	if (pci_read_config_word(dev, VT8231_BASE_REG, &val))
 		return -ENODEV;
 
 	address = val & ~(VT8231_EXTENT - 1);
@@ -1002,15 +1000,12 @@ static int vt8231_pci_probe(struct pci_dev *dev,
 		return -ENODEV;
 	}
 
-	if (0 != pci_read_config_word(dev, VT8231_ENABLE_REG,
-							&val))
+	if (pci_read_config_word(dev, VT8231_ENABLE_REG, &val))
 		return -ENODEV;
 
 	if (!(val & 0x0001)) {
 		dev_warn(&dev->dev, "enabling sensors\n");
-		if (0 !=
-			pci_write_config_word(dev, VT8231_ENABLE_REG,
-							val | 0x0001))
+		if (pci_write_config_word(dev, VT8231_ENABLE_REG, val | 0x0001))
 			return -ENODEV;
 	}
 
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 18/35] bcma: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (16 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 17/35] hwmon: (sis5595) Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 19/35] atm: " Saheed O. Bolarinwa
                   ` (18 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Rafał Miłecki
  Cc: Saheed O. Bolarinwa, linux-wireless, linux-kernel, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/bcma/driver_pci_host.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bcma/driver_pci_host.c b/drivers/bcma/driver_pci_host.c
index 88a93c266c19..b64ba68bdc8a 100644
--- a/drivers/bcma/driver_pci_host.c
+++ b/drivers/bcma/driver_pci_host.c
@@ -244,7 +244,7 @@ static int bcma_core_pci_hostmode_read_config(struct pci_bus *bus,
 				     PCI_FUNC(devfn), reg, val, size);
 	spin_unlock_irqrestore(&pc_host->cfgspace_lock, flags);
 
-	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return err ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static int bcma_core_pci_hostmode_write_config(struct pci_bus *bus,
@@ -264,7 +264,7 @@ static int bcma_core_pci_hostmode_write_config(struct pci_bus *bus,
 				      PCI_FUNC(devfn), reg, &val, size);
 	spin_unlock_irqrestore(&pc_host->cfgspace_lock, flags);
 
-	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return err ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 /* return cap_offset if requested capability exists in the PCI config space */
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
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https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 19/35] atm: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (17 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 18/35] bcma: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 20/35] atm: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (17 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Chas Williams
  Cc: linux-atm-general, Saheed O. Bolarinwa, linux-kernel, netdev,
	linux-pci, linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 drivers/atm/iphase.c | 4 ++--
 drivers/atm/lanai.c  | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c
index 8c7a996d1f16..b01cc491540d 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -2296,12 +2296,12 @@ static int reset_sar(struct atm_dev *dev)
 	iadev = INPH_IA_DEV(dev);  
 	for(i=0; i<64; i++)  
 	  if ((error = pci_read_config_dword(iadev->pci,  
-				i*4, &pci[i])) != PCIBIOS_SUCCESSFUL)  
+				i*4, &pci[i])) != 0)
   	      return error;  
 	writel(0, iadev->reg+IPHASE5575_EXT_RESET);  
 	for(i=0; i<64; i++)  
 	  if ((error = pci_write_config_dword(iadev->pci,  
-					i*4, pci[i])) != PCIBIOS_SUCCESSFUL)  
+					i*4, pci[i])) != 0)
 	    return error;  
 	udelay(5);  
 	return 0;  
diff --git a/drivers/atm/lanai.c b/drivers/atm/lanai.c
index 645a6bc1df88..2b82ae30dd74 100644
--- a/drivers/atm/lanai.c
+++ b/drivers/atm/lanai.c
@@ -1098,7 +1098,7 @@ static void pcistatus_check(struct lanai_dev *lanai, int clearonly)
 	u16 s;
 	int result;
 	result = pci_read_config_word(lanai->pci, PCI_STATUS, &s);
-	if (result != PCIBIOS_SUCCESSFUL) {
+	if (result != 0) {
 		printk(KERN_ERR DEV_LABEL "(itf %d): can't read PCI_STATUS: "
 		    "%d\n", lanai->number, result);
 		return;
@@ -1109,7 +1109,7 @@ static void pcistatus_check(struct lanai_dev *lanai, int clearonly)
 	if (s == 0)
 		return;
 	result = pci_write_config_word(lanai->pci, PCI_STATUS, s);
-	if (result != PCIBIOS_SUCCESSFUL)
+	if (result != 0)
 		printk(KERN_ERR DEV_LABEL "(itf %d): can't write PCI_STATUS: "
 		    "%d\n", lanai->number, result);
 	if (clearonly)
@@ -1949,7 +1949,7 @@ static int lanai_pci_start(struct lanai_dev *lanai)
 		return result;
 	/* Set latency timer to zero as per lanai docs */
 	result = pci_write_config_byte(pci, PCI_LATENCY_TIMER, 0);
-	if (result != PCIBIOS_SUCCESSFUL) {
+	if (result != 0) {
 		printk(KERN_ERR DEV_LABEL "(itf %d): can't write "
 		    "PCI_LATENCY_TIMER: %d\n", lanai->number, result);
 		return -EINVAL;
-- 
2.18.2

_______________________________________________
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Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 20/35] atm: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (18 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 19/35] atm: " Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 21/35] atm: Fix Style ERROR- assignment in if condition Saheed O. Bolarinwa
                   ` (16 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Chas Williams
  Cc: linux-atm-general, Saheed O. Bolarinwa, linux-kernel, netdev,
	linux-pci, linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 19/35

 drivers/atm/iphase.c | 10 ++++------
 drivers/atm/lanai.c  |  6 +++---
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c
index b01cc491540d..2c75b82b4e7f 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -2295,14 +2295,12 @@ static int reset_sar(struct atm_dev *dev)
 	  
 	iadev = INPH_IA_DEV(dev);  
 	for(i=0; i<64; i++)  
-	  if ((error = pci_read_config_dword(iadev->pci,  
-				i*4, &pci[i])) != 0)
-  	      return error;  
+		if ((error = pci_read_config_dword(iadev->pci, i*4, &pci[i])))
+			return error;
 	writel(0, iadev->reg+IPHASE5575_EXT_RESET);  
 	for(i=0; i<64; i++)  
-	  if ((error = pci_write_config_dword(iadev->pci,  
-					i*4, pci[i])) != 0)
-	    return error;  
+		if ((error = pci_write_config_dword(iadev->pci, i*4, pci[i])))
+			return error;
 	udelay(5);  
 	return 0;  
 }  
diff --git a/drivers/atm/lanai.c b/drivers/atm/lanai.c
index 2b82ae30dd74..5852b8cc0cc4 100644
--- a/drivers/atm/lanai.c
+++ b/drivers/atm/lanai.c
@@ -1098,7 +1098,7 @@ static void pcistatus_check(struct lanai_dev *lanai, int clearonly)
 	u16 s;
 	int result;
 	result = pci_read_config_word(lanai->pci, PCI_STATUS, &s);
-	if (result != 0) {
+	if (result) {
 		printk(KERN_ERR DEV_LABEL "(itf %d): can't read PCI_STATUS: "
 		    "%d\n", lanai->number, result);
 		return;
@@ -1109,7 +1109,7 @@ static void pcistatus_check(struct lanai_dev *lanai, int clearonly)
 	if (s == 0)
 		return;
 	result = pci_write_config_word(lanai->pci, PCI_STATUS, s);
-	if (result != 0)
+	if (result)
 		printk(KERN_ERR DEV_LABEL "(itf %d): can't write PCI_STATUS: "
 		    "%d\n", lanai->number, result);
 	if (clearonly)
@@ -1945,7 +1945,7 @@ static int lanai_pci_start(struct lanai_dev *lanai)
 		return -EBUSY;
 	}
 	result = check_board_id_and_rev("PCI", pci->subsystem_device, NULL);
-	if (result != 0)
+	if (result)
 		return result;
 	/* Set latency timer to zero as per lanai docs */
 	result = pci_write_config_byte(pci, PCI_LATENCY_TIMER, 0);
-- 
2.18.2

_______________________________________________
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https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 21/35] atm: Fix Style ERROR- assignment in if condition
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (19 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 20/35] atm: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 22/35] unicore32: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (15 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Chas Williams
  Cc: linux-atm-general, Saheed O. Bolarinwa, linux-kernel, netdev,
	linux-pci, linux-kernel-mentees

Move assignment out of the if condition
Fix style issues in the for-loop

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 20/35

 drivers/atm/iphase.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c
index 2c75b82b4e7f..584d9be5fa73 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -2294,13 +2294,19 @@ static int reset_sar(struct atm_dev *dev)
 	unsigned int pci[64];  
 	  
 	iadev = INPH_IA_DEV(dev);  
-	for(i=0; i<64; i++)  
-		if ((error = pci_read_config_dword(iadev->pci, i*4, &pci[i])))
+	for (i = 0; i < 64; i++) {
+		error = pci_read_config_dword(iadev->pci, i*4, &pci[i]);
+		if (error)
 			return error;
+	}
+
 	writel(0, iadev->reg+IPHASE5575_EXT_RESET);  
-	for(i=0; i<64; i++)  
-		if ((error = pci_write_config_dword(iadev->pci, i*4, pci[i])))
+	for (i = 0; i < 64; i++) {
+		error = pci_write_config_dword(iadev->pci, i*4, pci[i]);
+		if (error)
 			return error;
+	}
+
 	udelay(5);  
 	return 0;  
 }  
-- 
2.18.2

_______________________________________________
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Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 22/35] unicore32: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (20 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 21/35] atm: Fix Style ERROR- assignment in if condition Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 23/35] sparc/PCI: " Saheed O. Bolarinwa
                   ` (14 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Guan Xuetao
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-pci, linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/unicore32/kernel/pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/unicore32/kernel/pci.c b/arch/unicore32/kernel/pci.c
index 0d098aa05b47..401ab356c814 100644
--- a/arch/unicore32/kernel/pci.c
+++ b/arch/unicore32/kernel/pci.c
@@ -37,7 +37,7 @@ puv3_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		*value = readl(PCICFG_DATA);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -58,7 +58,7 @@ puv3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		writel(value, PCICFG_DATA);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops pci_puv3_ops = {
-- 
2.18.2

_______________________________________________
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Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 23/35] sparc/PCI: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (21 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 22/35] unicore32: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 24/35] sh: " Saheed O. Bolarinwa
                   ` (13 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, David S. Miller
  Cc: Saheed O. Bolarinwa, linux-kernel, sparclinux, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/sparc/kernel/pci_common.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/arch/sparc/kernel/pci_common.c b/arch/sparc/kernel/pci_common.c
index 4759ccd542fe..39175f26f401 100644
--- a/arch/sparc/kernel/pci_common.c
+++ b/arch/sparc/kernel/pci_common.c
@@ -59,7 +59,7 @@ static int sun4u_read_pci_cfg_host(struct pci_pbm_info *pbm,
 
 	addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
 	if (!addr)
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	switch (size) {
 	case 1:
@@ -102,7 +102,7 @@ static int sun4u_read_pci_cfg_host(struct pci_pbm_info *pbm,
 		*value |= tmp32 << 16;
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int sun4u_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
@@ -132,7 +132,7 @@ static int sun4u_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 
 	addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
 	if (!addr)
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	switch (size) {
 	case 1:
@@ -144,7 +144,7 @@ static int sun4u_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 		if (where & 0x01) {
 			printk("pci_read_config_word: misaligned reg [%x]\n",
 			       where);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		pci_config_read16((u16 *)addr, &tmp16);
 		*value = (u32) tmp16;
@@ -154,12 +154,12 @@ static int sun4u_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 		if (where & 0x03) {
 			printk("pci_read_config_dword: misaligned reg [%x]\n",
 			       where);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		pci_config_read32(addr, value);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int sun4u_write_pci_cfg_host(struct pci_pbm_info *pbm,
@@ -170,7 +170,7 @@ static int sun4u_write_pci_cfg_host(struct pci_pbm_info *pbm,
 
 	addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
 	if (!addr)
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	switch (size) {
 	case 1:
@@ -206,7 +206,7 @@ static int sun4u_write_pci_cfg_host(struct pci_pbm_info *pbm,
 					 where + 2, 2, value >> 16);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int sun4u_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
@@ -222,7 +222,7 @@ static int sun4u_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 
 	addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
 	if (!addr)
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	switch (size) {
 	case 1:
@@ -233,7 +233,7 @@ static int sun4u_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 		if (where & 0x01) {
 			printk("pci_write_config_word: misaligned reg [%x]\n",
 			       where);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		pci_config_write16((u16 *)addr, value);
 		break;
@@ -242,11 +242,11 @@ static int sun4u_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 		if (where & 0x03) {
 			printk("pci_write_config_dword: misaligned reg [%x]\n",
 			       where);
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		}
 		pci_config_write32(addr, value);
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops sun4u_pci_ops = {
@@ -284,7 +284,7 @@ static int sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 	}
 
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
@@ -307,7 +307,7 @@ static int sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 				     HV_PCI_DEVICE_BUILD(bus, device, func),
 				     where, size, value);
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops sun4v_pci_ops = {
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 24/35] sh: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (22 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 23/35] sparc/PCI: " Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-20 21:41   ` Rich Felker
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 25/35] sh: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (12 subsequent siblings)
  36 siblings, 1 reply; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Yoshinori Sato, Rich Felker
  Cc: linux-sh, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/sh/drivers/pci/common.c        | 2 +-
 arch/sh/drivers/pci/ops-dreamcast.c | 4 ++--
 arch/sh/drivers/pci/ops-sh4.c       | 4 ++--
 arch/sh/drivers/pci/ops-sh7786.c    | 8 ++++----
 arch/sh/drivers/pci/pci.c           | 2 +-
 5 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/sh/drivers/pci/common.c b/arch/sh/drivers/pci/common.c
index fe163ecd0719..ee27cdfd3e68 100644
--- a/arch/sh/drivers/pci/common.c
+++ b/arch/sh/drivers/pci/common.c
@@ -61,7 +61,7 @@ int __init pci_is_66mhz_capable(struct pci_channel *hose,
 			continue;
 		if (early_read_config_word(hose, top_bus, current_bus,
 					   pci_devfn, PCI_VENDOR_ID, &vid) !=
-		    PCIBIOS_SUCCESSFUL)
+		    0)
 			continue;
 		if (vid == 0xffff)
 			continue;
diff --git a/arch/sh/drivers/pci/ops-dreamcast.c b/arch/sh/drivers/pci/ops-dreamcast.c
index 517a8a9702f6..431cd006951f 100644
--- a/arch/sh/drivers/pci/ops-dreamcast.c
+++ b/arch/sh/drivers/pci/ops-dreamcast.c
@@ -56,7 +56,7 @@ static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int
 	case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break;
 	}
 
-        return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
@@ -70,7 +70,7 @@ static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int
 	case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break;
 	}
 
-        return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops gapspci_pci_ops = {
diff --git a/arch/sh/drivers/pci/ops-sh4.c b/arch/sh/drivers/pci/ops-sh4.c
index a205be3bfc4a..4d757e5f38c6 100644
--- a/arch/sh/drivers/pci/ops-sh4.c
+++ b/arch/sh/drivers/pci/ops-sh4.c
@@ -49,7 +49,7 @@ static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
 		return PCIBIOS_FUNC_NOT_SUPPORTED;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 /*
@@ -90,7 +90,7 @@ static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
 
 	pci_write_reg(chan, data, SH4_PCIPDR);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops sh4_pci_ops = {
diff --git a/arch/sh/drivers/pci/ops-sh7786.c b/arch/sh/drivers/pci/ops-sh7786.c
index a10f9f4ebd7f..7c329e467360 100644
--- a/arch/sh/drivers/pci/ops-sh7786.c
+++ b/arch/sh/drivers/pci/ops-sh7786.c
@@ -52,7 +52,7 @@ static int sh7786_pcie_config_access(unsigned char access_type,
 			else
 				pci_write_reg(chan, *data, PCI_REG(reg));
 
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 		} else if (dev > 1)
 			return PCIBIOS_DEVICE_NOT_FOUND;
 	}
@@ -83,7 +83,7 @@ static int sh7786_pcie_config_access(unsigned char access_type,
 	/* Disable the configuration access */
 	pci_write_reg(chan, 0, SH4A_PCIEPCTLR);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,
@@ -101,7 +101,7 @@ static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,
 	raw_spin_lock_irqsave(&pci_config_lock, flags);
 	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
 					devfn, where, &data);
-	if (ret != PCIBIOS_SUCCESSFUL) {
+	if (ret != 0) {
 		*val = 0xffffffff;
 		goto out;
 	}
@@ -137,7 +137,7 @@ static int sh7786_pcie_write(struct pci_bus *bus, unsigned int devfn,
 	raw_spin_lock_irqsave(&pci_config_lock, flags);
 	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
 					devfn, where, &data);
-	if (ret != PCIBIOS_SUCCESSFUL)
+	if (ret != 0)
 		goto out;
 
 	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x "
diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index c7784e156964..77130f035fdd 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -204,7 +204,7 @@ pcibios_bus_report_status_early(struct pci_channel *hose,
 			continue;
 		ret = early_read_config_word(hose, top_bus, current_bus,
 					     pci_devfn, PCI_STATUS, &status);
-		if (ret != PCIBIOS_SUCCESSFUL)
+		if (ret != 0)
 			continue;
 		if (status == 0xffff)
 			continue;
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 25/35] sh: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (23 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 24/35] sh: " Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 26/35] powerpc: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (11 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Yoshinori Sato, Rich Felker
  Cc: linux-sh, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 24/35

 arch/sh/drivers/pci/common.c     | 3 +--
 arch/sh/drivers/pci/ops-sh7786.c | 4 ++--
 arch/sh/drivers/pci/pci.c        | 2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/sh/drivers/pci/common.c b/arch/sh/drivers/pci/common.c
index ee27cdfd3e68..676907e6a514 100644
--- a/arch/sh/drivers/pci/common.c
+++ b/arch/sh/drivers/pci/common.c
@@ -60,8 +60,7 @@ int __init pci_is_66mhz_capable(struct pci_channel *hose,
 		if (PCI_FUNC(pci_devfn))
 			continue;
 		if (early_read_config_word(hose, top_bus, current_bus,
-					   pci_devfn, PCI_VENDOR_ID, &vid) !=
-		    0)
+					   pci_devfn, PCI_VENDOR_ID, &vid))
 			continue;
 		if (vid == 0xffff)
 			continue;
diff --git a/arch/sh/drivers/pci/ops-sh7786.c b/arch/sh/drivers/pci/ops-sh7786.c
index 7c329e467360..c1be0ac2508a 100644
--- a/arch/sh/drivers/pci/ops-sh7786.c
+++ b/arch/sh/drivers/pci/ops-sh7786.c
@@ -101,7 +101,7 @@ static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,
 	raw_spin_lock_irqsave(&pci_config_lock, flags);
 	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
 					devfn, where, &data);
-	if (ret != 0) {
+	if (ret) {
 		*val = 0xffffffff;
 		goto out;
 	}
@@ -137,7 +137,7 @@ static int sh7786_pcie_write(struct pci_bus *bus, unsigned int devfn,
 	raw_spin_lock_irqsave(&pci_config_lock, flags);
 	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
 					devfn, where, &data);
-	if (ret != 0)
+	if (ret)
 		goto out;
 
 	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x "
diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index 77130f035fdd..19e9a211c23e 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -204,7 +204,7 @@ pcibios_bus_report_status_early(struct pci_channel *hose,
 			continue;
 		ret = early_read_config_word(hose, top_bus, current_bus,
 					     pci_devfn, PCI_STATUS, &status);
-		if (ret != 0)
+		if (ret)
 			continue;
 		if (status == 0xffff)
 			continue;
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 26/35] powerpc: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (24 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 25/35] sh: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 27/35] powerpc: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (10 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Michael Ellerman, Benjamin Herrenschmidt, Paul Mackerras
  Cc: linuxppc-dev, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/powerpc/kernel/rtas_pci.c                 |  4 ++--
 arch/powerpc/platforms/4xx/pci.c               |  4 ++--
 arch/powerpc/platforms/52xx/efika.c            |  4 ++--
 arch/powerpc/platforms/52xx/mpc52xx_pci.c      |  4 ++--
 arch/powerpc/platforms/82xx/pq2.c              |  2 +-
 arch/powerpc/platforms/85xx/mpc85xx_cds.c      |  2 +-
 arch/powerpc/platforms/85xx/mpc85xx_ds.c       |  2 +-
 arch/powerpc/platforms/86xx/mpc86xx_hpcn.c     |  2 +-
 arch/powerpc/platforms/chrp/pci.c              |  8 ++++----
 arch/powerpc/platforms/embedded6xx/holly.c     |  2 +-
 .../platforms/embedded6xx/mpc7448_hpc2.c       |  2 +-
 arch/powerpc/platforms/fsl_uli1575.c           |  2 +-
 arch/powerpc/platforms/maple/pci.c             | 18 +++++++++---------
 arch/powerpc/platforms/pasemi/pci.c            |  6 +++---
 arch/powerpc/platforms/powermac/pci.c          |  8 ++++----
 arch/powerpc/platforms/powernv/eeh-powernv.c   |  4 ++--
 arch/powerpc/platforms/powernv/pci.c           |  4 ++--
 arch/powerpc/platforms/pseries/eeh_pseries.c   |  4 ++--
 arch/powerpc/sysdev/fsl_pci.c                  |  2 +-
 arch/powerpc/sysdev/indirect_pci.c             |  4 ++--
 arch/powerpc/sysdev/tsi108_pci.c               |  4 ++--
 21 files changed, 46 insertions(+), 46 deletions(-)

diff --git a/arch/powerpc/kernel/rtas_pci.c b/arch/powerpc/kernel/rtas_pci.c
index 781c1869902e..18108ed9284c 100644
--- a/arch/powerpc/kernel/rtas_pci.c
+++ b/arch/powerpc/kernel/rtas_pci.c
@@ -71,7 +71,7 @@ int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
 	if (ret)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rtas_pci_read_config(struct pci_bus *bus,
@@ -121,7 +121,7 @@ int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
 	if (ret)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rtas_pci_write_config(struct pci_bus *bus,
diff --git a/arch/powerpc/platforms/4xx/pci.c b/arch/powerpc/platforms/4xx/pci.c
index c13d64c3b019..3e6799d987d2 100644
--- a/arch/powerpc/platforms/4xx/pci.c
+++ b/arch/powerpc/platforms/4xx/pci.c
@@ -1652,7 +1652,7 @@ static int ppc4xx_pciex_read_config(struct pci_bus *bus, unsigned int devfn,
 
 	dcr_write(port->dcrs, DCRO_PEGPL_CFG, gpl_cfg);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int ppc4xx_pciex_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -1696,7 +1696,7 @@ static int ppc4xx_pciex_write_config(struct pci_bus *bus, unsigned int devfn,
 
 	dcr_write(port->dcrs, DCRO_PEGPL_CFG, gpl_cfg);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops ppc4xx_pciex_pci_ops =
diff --git a/arch/powerpc/platforms/52xx/efika.c b/arch/powerpc/platforms/52xx/efika.c
index 4514a6f7458a..ef2584eb2dad 100644
--- a/arch/powerpc/platforms/52xx/efika.c
+++ b/arch/powerpc/platforms/52xx/efika.c
@@ -44,7 +44,7 @@ static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 
 	rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
 	*val = ret;
-	return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return rval ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static int rtas_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -58,7 +58,7 @@ static int rtas_write_config(struct pci_bus *bus, unsigned int devfn,
 
 	rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
 			 addr, len, val);
-	return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return rval ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static struct pci_ops rtas_pci_ops = {
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pci.c b/arch/powerpc/platforms/52xx/mpc52xx_pci.c
index af0f79995214..b9c2d0a7077e 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pci.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pci.c
@@ -157,7 +157,7 @@ mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 	out_be32(hose->cfg_addr, 0);
 	mb();
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -221,7 +221,7 @@ mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 	out_be32(hose->cfg_addr, 0);
 	mb();
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops mpc52xx_pci_ops = {
diff --git a/arch/powerpc/platforms/82xx/pq2.c b/arch/powerpc/platforms/82xx/pq2.c
index 3b5cb39a564c..c15b3b0ed118 100644
--- a/arch/powerpc/platforms/82xx/pq2.c
+++ b/arch/powerpc/platforms/82xx/pq2.c
@@ -40,7 +40,7 @@ static int pq2_pci_exclude_device(struct pci_controller *hose,
 	if (bus == 0 && PCI_SLOT(devfn) == 0)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	else
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 }
 
 static void __init pq2_pci_add_bridge(struct device_node *np)
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
index 172d2b7cfeb7..66f00eb2a8be 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
@@ -76,7 +76,7 @@ static int mpc85xx_exclude_device(struct pci_controller *hose,
 	if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	else
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 }
 
 static int mpc85xx_cds_restart(struct notifier_block *this,
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_ds.c b/arch/powerpc/platforms/85xx/mpc85xx_ds.c
index 2157a8017aa4..f33ac8e04da6 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_ds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_ds.c
@@ -118,7 +118,7 @@ static int mpc85xx_exclude_device(struct pci_controller *hose,
 	if (hose->dn == pci_with_uli)
 		return uli_exclude_device(hose, bus, devfn);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 #endif	/* CONFIG_PCI */
 
diff --git a/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c b/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
index b697918b727d..36b38b28d40b 100644
--- a/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
+++ b/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
@@ -49,7 +49,7 @@ static int mpc86xx_exclude_device(struct pci_controller *hose,
 	if (hose->dn == fsl_pci_primary)
 		return uli_exclude_device(hose, bus, devfn);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 #endif /* CONFIG_PCI */
 
diff --git a/arch/powerpc/platforms/chrp/pci.c b/arch/powerpc/platforms/chrp/pci.c
index b2c2bf35b76c..c8f8356607c7 100644
--- a/arch/powerpc/platforms/chrp/pci.c
+++ b/arch/powerpc/platforms/chrp/pci.c
@@ -55,7 +55,7 @@ static int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
 		*val = in_le32(cfg_data);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
@@ -82,7 +82,7 @@ static int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
 		out_le32(cfg_data, val);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops gg2_pci_ops =
@@ -106,7 +106,7 @@ static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 
 	rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
 	*val = ret;
-	return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
+	return rval ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
@@ -120,7 +120,7 @@ static int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset
 
 	rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
 			 addr, len, val);
-	return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
+	return rval ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static struct pci_ops rtas_pci_ops =
diff --git a/arch/powerpc/platforms/embedded6xx/holly.c b/arch/powerpc/platforms/embedded6xx/holly.c
index d8f2e2c737bb..f9fca540c52a 100644
--- a/arch/powerpc/platforms/embedded6xx/holly.c
+++ b/arch/powerpc/platforms/embedded6xx/holly.c
@@ -47,7 +47,7 @@ static int holly_exclude_device(struct pci_controller *hose, u_char bus,
 	if (bus == 0 && PCI_SLOT(devfn) == 0)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	else
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 }
 
 static void holly_remap_bridge(void)
diff --git a/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c b/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
index 15437abe1f6d..34f6a0ecdf67 100644
--- a/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
+++ b/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
@@ -55,7 +55,7 @@ int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
 	if (bus == 0 && PCI_SLOT(devfn) == 0)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	else
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 }
 
 static void __init mpc7448_hpc2_setup_arch(void)
diff --git a/arch/powerpc/platforms/fsl_uli1575.c b/arch/powerpc/platforms/fsl_uli1575.c
index 044a20c1fbde..17c2cb5a8682 100644
--- a/arch/powerpc/platforms/fsl_uli1575.c
+++ b/arch/powerpc/platforms/fsl_uli1575.c
@@ -353,5 +353,5 @@ int uli_exclude_device(struct pci_controller *hose,
 			return PCIBIOS_DEVICE_NOT_FOUND;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
diff --git a/arch/powerpc/platforms/maple/pci.c b/arch/powerpc/platforms/maple/pci.c
index c86a66d5e998..4e49f465056d 100644
--- a/arch/powerpc/platforms/maple/pci.c
+++ b/arch/powerpc/platforms/maple/pci.c
@@ -142,7 +142,7 @@ static int u3_agp_read_config(struct pci_bus *bus, unsigned int devfn,
 		*val = in_le32(addr);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int u3_agp_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -173,7 +173,7 @@ static int u3_agp_write_config(struct pci_bus *bus, unsigned int devfn,
 		out_le32(addr, val);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops u3_agp_pci_ops =
@@ -223,7 +223,7 @@ static int u3_ht_root_read_config(struct pci_controller *hose, u8 offset,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int u3_ht_root_write_config(struct pci_controller *hose, u8 offset,
@@ -234,7 +234,7 @@ static int u3_ht_root_write_config(struct pci_controller *hose, u8 offset,
 	addr = hose->cfg_addr + ((offset & ~3) << 2) + (4 - len - (offset & 3));
 
 	if (offset >= PCI_BASE_ADDRESS_0 && offset < PCI_CAPABILITY_LIST)
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	switch (len) {
 	case 1:
@@ -248,7 +248,7 @@ static int u3_ht_root_write_config(struct pci_controller *hose, u8 offset,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
@@ -286,7 +286,7 @@ static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
 		*val = in_le32(addr);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -323,7 +323,7 @@ static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
 		out_le32(addr, val);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops u3_ht_pci_ops =
@@ -397,7 +397,7 @@ static int u4_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
                 *val = in_le32(addr);
                 break;
         }
-        return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 static int u4_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
                                 int offset, int len, u32 val)
@@ -428,7 +428,7 @@ static int u4_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
                 out_le32(addr, val);
                 break;
         }
-        return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops u4_pcie_pci_ops =
diff --git a/arch/powerpc/platforms/pasemi/pci.c b/arch/powerpc/platforms/pasemi/pci.c
index 8779b107d872..e558a402532a 100644
--- a/arch/powerpc/platforms/pasemi/pci.c
+++ b/arch/powerpc/platforms/pasemi/pci.c
@@ -166,7 +166,7 @@ static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
 	if (workaround_5945(bus, devfn, offset, len, val))
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
 
@@ -188,7 +188,7 @@ static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -223,7 +223,7 @@ static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn,
 		out_le32(addr, val);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops pa_pxp_ops = {
diff --git a/arch/powerpc/platforms/powermac/pci.c b/arch/powerpc/platforms/powermac/pci.c
index e35eaa9cf938..bdc9a89b5181 100644
--- a/arch/powerpc/platforms/powermac/pci.c
+++ b/arch/powerpc/platforms/powermac/pci.c
@@ -307,7 +307,7 @@ static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
 		default:
 			*val = 0xfffffffful; break;
 		}
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	default:
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
@@ -327,7 +327,7 @@ static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
 		*val = swap ? in_le32(addr) : in_be32(addr);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -350,7 +350,7 @@ static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
 	case 0:
 		break;
 	case 1:
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	default:
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
@@ -370,7 +370,7 @@ static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
 		swap ? out_le32(addr, val) : out_be32(addr, val);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops u3_ht_pci_ops =
diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 79409e005fcd..92f145dc9c1d 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -318,7 +318,7 @@ static int pnv_eeh_find_ecap(struct pci_dn *pdn, int cap)
 
 	if (!edev || !edev->pcie_cap)
 		return 0;
-	if (pnv_pci_cfg_read(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
+	if (pnv_pci_cfg_read(pdn, pos, 4, &header) != 0)
 		return 0;
 	else if (!header)
 		return 0;
@@ -331,7 +331,7 @@ static int pnv_eeh_find_ecap(struct pci_dn *pdn, int cap)
 		if (pos < 256)
 			break;
 
-		if (pnv_pci_cfg_read(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
+		if (pnv_pci_cfg_read(pdn, pos, 4, &header) != 0)
 			break;
 	}
 
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 091fe1cf386b..b3d5cc3e262a 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -685,7 +685,7 @@ int pnv_pci_cfg_read(struct pci_dn *pdn,
 
 	pr_devel("%s: bus: %x devfn: %x +%x/%x -> %08x\n",
 		 __func__, pdn->busno, pdn->devfn, where, size, *val);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 int pnv_pci_cfg_write(struct pci_dn *pdn,
@@ -710,7 +710,7 @@ int pnv_pci_cfg_write(struct pci_dn *pdn,
 		return PCIBIOS_FUNC_NOT_SUPPORTED;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 #if CONFIG_EEH
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c
index ace117f99d94..9c023b928f2c 100644
--- a/arch/powerpc/platforms/pseries/eeh_pseries.c
+++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
@@ -200,7 +200,7 @@ static int pseries_eeh_find_ecap(struct pci_dn *pdn, int cap)
 
 	if (!edev || !edev->pcie_cap)
 		return 0;
-	if (rtas_read_config(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
+	if (rtas_read_config(pdn, pos, 4, &header) != 0)
 		return 0;
 	else if (!header)
 		return 0;
@@ -213,7 +213,7 @@ static int pseries_eeh_find_ecap(struct pci_dn *pdn, int cap)
 		if (pos < 256)
 			break;
 
-		if (rtas_read_config(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
+		if (rtas_read_config(pdn, pos, 4, &header) != 0)
 			break;
 	}
 
diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 040b9d01c079..f1118c4443f4 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -697,7 +697,7 @@ static int mpc83xx_pcie_exclude_device(struct pci_bus *bus, unsigned int devfn)
 			return PCIBIOS_DEVICE_NOT_FOUND;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static void __iomem *mpc83xx_pcie_remap_cfg(struct pci_bus *bus,
diff --git a/arch/powerpc/sysdev/indirect_pci.c b/arch/powerpc/sysdev/indirect_pci.c
index 09b36617425e..35b21276609b 100644
--- a/arch/powerpc/sysdev/indirect_pci.c
+++ b/arch/powerpc/sysdev/indirect_pci.c
@@ -70,7 +70,7 @@ int __indirect_read_config(struct pci_controller *hose,
 		*val = in_le32(cfg_data);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 int indirect_read_config(struct pci_bus *bus, unsigned int devfn,
@@ -148,7 +148,7 @@ int indirect_write_config(struct pci_bus *bus, unsigned int devfn,
 		out_le32(cfg_data, val);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops indirect_pci_ops =
diff --git a/arch/powerpc/sysdev/tsi108_pci.c b/arch/powerpc/sysdev/tsi108_pci.c
index 49f9541954f8..586dabb4e7ea 100644
--- a/arch/powerpc/sysdev/tsi108_pci.c
+++ b/arch/powerpc/sysdev/tsi108_pci.c
@@ -78,7 +78,7 @@ tsi108_direct_write_config(struct pci_bus *bus, unsigned int devfunc,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 void tsi108_clear_pci_error(u32 pci_cfg_base)
@@ -167,7 +167,7 @@ tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 		printk("data = 0x%x\n", *val);
 	}
 #endif
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 void tsi108_clear_pci_cfg_error(void)
-- 
2.18.2

_______________________________________________
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 27/35] powerpc: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (25 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 26/35] powerpc: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 28/35] mips: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (9 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Michael Ellerman, Benjamin Herrenschmidt, Paul Mackerras
  Cc: linuxppc-dev, Saheed O. Bolarinwa, linux-kernel, linux-pci,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 26/35

 arch/powerpc/platforms/powernv/eeh-powernv.c | 4 ++--
 arch/powerpc/platforms/pseries/eeh_pseries.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 92f145dc9c1d..834cb6175cc4 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -318,7 +318,7 @@ static int pnv_eeh_find_ecap(struct pci_dn *pdn, int cap)
 
 	if (!edev || !edev->pcie_cap)
 		return 0;
-	if (pnv_pci_cfg_read(pdn, pos, 4, &header) != 0)
+	if (pnv_pci_cfg_read(pdn, pos, 4, &header))
 		return 0;
 	else if (!header)
 		return 0;
@@ -331,7 +331,7 @@ static int pnv_eeh_find_ecap(struct pci_dn *pdn, int cap)
 		if (pos < 256)
 			break;
 
-		if (pnv_pci_cfg_read(pdn, pos, 4, &header) != 0)
+		if (pnv_pci_cfg_read(pdn, pos, 4, &header))
 			break;
 	}
 
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c
index 9c023b928f2c..aec6f76879a9 100644
--- a/arch/powerpc/platforms/pseries/eeh_pseries.c
+++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
@@ -200,7 +200,7 @@ static int pseries_eeh_find_ecap(struct pci_dn *pdn, int cap)
 
 	if (!edev || !edev->pcie_cap)
 		return 0;
-	if (rtas_read_config(pdn, pos, 4, &header) != 0)
+	if (rtas_read_config(pdn, pos, 4, &header))
 		return 0;
 	else if (!header)
 		return 0;
@@ -213,7 +213,7 @@ static int pseries_eeh_find_ecap(struct pci_dn *pdn, int cap)
 		if (pos < 256)
 			break;
 
-		if (rtas_read_config(pdn, pos, 4, &header) != 0)
+		if (rtas_read_config(pdn, pos, 4, &header))
 			break;
 	}
 
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 28/35] mips: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (26 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 27/35] powerpc: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 29/35] mips: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (8 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Thomas Bogendoerfer
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-mips, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/mips/pci/fixup-ath79.c      |  2 +-
 arch/mips/pci/ops-bcm63xx.c      | 14 +++++++-------
 arch/mips/pci/ops-bonito64.c     |  4 ++--
 arch/mips/pci/ops-gt64xxx_pci0.c |  4 ++--
 arch/mips/pci/ops-lantiq.c       |  4 ++--
 arch/mips/pci/ops-loongson2.c    |  4 ++--
 arch/mips/pci/ops-mace.c         |  4 ++--
 arch/mips/pci/ops-msc.c          |  4 ++--
 arch/mips/pci/ops-rc32434.c      |  6 +++---
 arch/mips/pci/ops-sni.c          |  4 ++--
 arch/mips/pci/ops-tx3927.c       |  2 +-
 arch/mips/pci/ops-tx4927.c       |  2 +-
 arch/mips/pci/ops-vr41xx.c       |  4 ++--
 arch/mips/pci/pci-alchemy.c      |  6 +++---
 arch/mips/pci/pci-ar2315.c       |  4 ++--
 arch/mips/pci/pci-ar71xx.c       |  4 ++--
 arch/mips/pci/pci-ar724x.c       |  6 +++---
 arch/mips/pci/pci-bcm1480.c      |  4 ++--
 arch/mips/pci/pci-bcm1480ht.c    |  4 ++--
 arch/mips/pci/pci-mt7620.c       |  4 ++--
 arch/mips/pci/pci-octeon.c       | 12 ++++++------
 arch/mips/pci/pci-rt2880.c       |  4 ++--
 arch/mips/pci/pci-rt3883.c       |  4 ++--
 arch/mips/pci/pci-sb1250.c       |  4 ++--
 arch/mips/pci/pci-virtio-guest.c |  4 ++--
 arch/mips/pci/pci-xlp.c          |  4 ++--
 arch/mips/pci/pci-xlr.c          |  4 ++--
 arch/mips/pci/pci-xtalk-bridge.c | 14 +++++++-------
 arch/mips/pci/pcie-octeon.c      |  4 ++--
 arch/mips/txx9/generic/pci.c     |  4 ++--
 30 files changed, 74 insertions(+), 74 deletions(-)

diff --git a/arch/mips/pci/fixup-ath79.c b/arch/mips/pci/fixup-ath79.c
index 09a4ce53424f..6a6c4f58f7f4 100644
--- a/arch/mips/pci/fixup-ath79.c
+++ b/arch/mips/pci/fixup-ath79.c
@@ -9,7 +9,7 @@
 
 int pcibios_plat_dev_init(struct pci_dev *dev)
 {
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
diff --git a/arch/mips/pci/ops-bcm63xx.c b/arch/mips/pci/ops-bcm63xx.c
index dc6dc2741272..3e88e4869f37 100644
--- a/arch/mips/pci/ops-bcm63xx.c
+++ b/arch/mips/pci/ops-bcm63xx.c
@@ -115,7 +115,7 @@ static int bcm63xx_do_cfg_read(int type, unsigned int busn,
 
 	*val = postprocess_read(data, where, size);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int bcm63xx_do_cfg_write(int type, unsigned int busn,
@@ -141,7 +141,7 @@ static int bcm63xx_do_cfg_write(int type, unsigned int busn,
 	/* restore IO space normal behaviour */
 	bcm_mpi_writel(0, MPI_L2PCFG_REG);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int bcm63xx_pci_read(struct pci_bus *bus, unsigned int devfn,
@@ -282,7 +282,7 @@ static int fake_cb_bridge_read(int where, int size, u32 *val)
 	}
 
 	*val = postprocess_read(data, where, size);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 /*
@@ -295,7 +295,7 @@ static int fake_cb_bridge_write(int where, int size, u32 val)
 	int ret;
 
 	ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
-	if (ret != PCIBIOS_SUCCESSFUL)
+	if (ret != 0)
 		return ret;
 
 	data = preprocess_write(data, val, where, size);
@@ -356,7 +356,7 @@ static int fake_cb_bridge_write(int where, int size, u32 val)
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn,
@@ -496,7 +496,7 @@ static int bcm63xx_pcie_read(struct pci_bus *bus, unsigned int devfn,
 
 	*val = postprocess_read(data, where, size);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 
 }
 
@@ -518,7 +518,7 @@ static int bcm63xx_pcie_write(struct pci_bus *bus, unsigned int devfn,
 	data = preprocess_write(data, val, where, size);
 	bcm_pcie_writel(data, reg);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 
diff --git a/arch/mips/pci/ops-bonito64.c b/arch/mips/pci/ops-bonito64.c
index 4d5fe614f55e..0d0a5d52dee6 100644
--- a/arch/mips/pci/ops-bonito64.c
+++ b/arch/mips/pci/ops-bonito64.c
@@ -107,7 +107,7 @@ static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
@@ -139,7 +139,7 @@ static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 				       &data))
 		return -1;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops bonito64_pci_ops = {
diff --git a/arch/mips/pci/ops-gt64xxx_pci0.c b/arch/mips/pci/ops-gt64xxx_pci0.c
index 501dcdf5a18c..d50a0ac0848d 100644
--- a/arch/mips/pci/ops-gt64xxx_pci0.c
+++ b/arch/mips/pci/ops-gt64xxx_pci0.c
@@ -104,7 +104,7 @@ static int gt64xxx_pci0_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int gt64xxx_pci0_pcibios_write(struct pci_bus *bus, unsigned int devfn,
@@ -131,7 +131,7 @@ static int gt64xxx_pci0_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 					       where, &data))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops gt64xxx_pci0_ops = {
diff --git a/arch/mips/pci/ops-lantiq.c b/arch/mips/pci/ops-lantiq.c
index 7d71355394a6..9e9fd1c01199 100644
--- a/arch/mips/pci/ops-lantiq.c
+++ b/arch/mips/pci/ops-lantiq.c
@@ -83,7 +83,7 @@ int ltq_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 int ltq_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn,
@@ -109,5 +109,5 @@ int ltq_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn,
 	if (ltq_pci_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
diff --git a/arch/mips/pci/ops-loongson2.c b/arch/mips/pci/ops-loongson2.c
index 0d1b36ba1c21..79d7ad3aa19f 100644
--- a/arch/mips/pci/ops-loongson2.c
+++ b/arch/mips/pci/ops-loongson2.c
@@ -136,7 +136,7 @@ static int loongson_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int loongson_pcibios_write(struct pci_bus *bus, unsigned int devfn,
@@ -168,7 +168,7 @@ static int loongson_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 				       &data))
 		return -1;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops loongson_pci_ops = {
diff --git a/arch/mips/pci/ops-mace.c b/arch/mips/pci/ops-mace.c
index 951d8070fb48..1593514d71f8 100644
--- a/arch/mips/pci/ops-mace.c
+++ b/arch/mips/pci/ops-mace.c
@@ -69,7 +69,7 @@ mace_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 
 	DPRINTK("read%d: reg=%08x,val=%02x\n", size * 8, reg, *val);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -91,7 +91,7 @@ mace_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 
 	DPRINTK("write%d: reg=%08x,val=%02x\n", size * 8, reg, val);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops mace_pci_ops = {
diff --git a/arch/mips/pci/ops-msc.c b/arch/mips/pci/ops-msc.c
index 1f438baaf907..722a7992d7b5 100644
--- a/arch/mips/pci/ops-msc.c
+++ b/arch/mips/pci/ops-msc.c
@@ -93,7 +93,7 @@ static int msc_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int msc_pcibios_write(struct pci_bus *bus, unsigned int devfn,
@@ -125,7 +125,7 @@ static int msc_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 				       &data))
 		return -1;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops msc_pci_ops = {
diff --git a/arch/mips/pci/ops-rc32434.c b/arch/mips/pci/ops-rc32434.c
index 874ed6df9768..52714e58572d 100644
--- a/arch/mips/pci/ops-rc32434.c
+++ b/arch/mips/pci/ops-rc32434.c
@@ -140,7 +140,7 @@ write_config_byte(struct pci_bus *bus, unsigned int devfn, int where,
 	if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
 		return -1;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 
@@ -160,7 +160,7 @@ write_config_word(struct pci_bus *bus, unsigned int devfn, int where,
 		return -1;
 
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 
@@ -171,7 +171,7 @@ write_config_dword(struct pci_bus *bus, unsigned int devfn, int where,
 	if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &val))
 		return -1;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pci_config_read(struct pci_bus *bus, unsigned int devfn,
diff --git a/arch/mips/pci/ops-sni.c b/arch/mips/pci/ops-sni.c
index 35daa7fe6571..27468a603470 100644
--- a/arch/mips/pci/ops-sni.c
+++ b/arch/mips/pci/ops-sni.c
@@ -34,7 +34,7 @@ static int set_config_address(unsigned int busno, unsigned int devfn, int reg)
 		 ((devfn    & 0xff) <<	8) |
 		  (reg	    & 0xfc);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pcimt_read(struct pci_bus *bus, unsigned int devfn, int reg,
@@ -94,7 +94,7 @@ static int pcit_set_config_address(unsigned int busno, unsigned int devfn, int r
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
 	outl((1 << 31) | ((busno & 0xff) << 16) | ((devfn & 0xff) << 8) | (reg & 0xfc), 0xcf8);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pcit_read(struct pci_bus *bus, unsigned int devfn, int reg,
diff --git a/arch/mips/pci/ops-tx3927.c b/arch/mips/pci/ops-tx3927.c
index d35dc9c9ab9d..7fe187879897 100644
--- a/arch/mips/pci/ops-tx3927.c
+++ b/arch/mips/pci/ops-tx3927.c
@@ -70,7 +70,7 @@ static inline int check_abort(void)
 		iob();
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int tx3927_pci_read_config(struct pci_bus *bus, unsigned int devfn,
diff --git a/arch/mips/pci/ops-tx4927.c b/arch/mips/pci/ops-tx4927.c
index f7802f100401..1b3cea631448 100644
--- a/arch/mips/pci/ops-tx4927.c
+++ b/arch/mips/pci/ops-tx4927.c
@@ -74,7 +74,7 @@ static int mkaddr(struct pci_bus *bus, unsigned int devfn, int where,
 
 static int check_abort(struct tx4927_pcic_reg __iomem *pcicptr)
 {
-	int code = PCIBIOS_SUCCESSFUL;
+	int code = 0;
 
 	/* wait write cycle completion before checking error status */
 	while (__raw_readl(&pcicptr->pcicstatus) & TX4927_PCIC_PCICSTATUS_IWB)
diff --git a/arch/mips/pci/ops-vr41xx.c b/arch/mips/pci/ops-vr41xx.c
index 7b7709aa14c7..f54cb555c743 100644
--- a/arch/mips/pci/ops-vr41xx.c
+++ b/arch/mips/pci/ops-vr41xx.c
@@ -70,7 +70,7 @@ static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
 		return PCIBIOS_FUNC_NOT_SUPPORTED;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
@@ -104,7 +104,7 @@ static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
 
 	writel(data, PCICONFDREG);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops vr41xx_pci_ops = {
diff --git a/arch/mips/pci/pci-alchemy.c b/arch/mips/pci/pci-alchemy.c
index 7285b5667568..937f912fba20 100644
--- a/arch/mips/pci/pci-alchemy.c
+++ b/arch/mips/pci/pci-alchemy.c
@@ -103,7 +103,7 @@ static int config_access(unsigned char access_type, struct pci_bus *bus,
 	unsigned int device = PCI_SLOT(dev_fn);
 	unsigned int function = PCI_FUNC(dev_fn);
 	unsigned long offset, status, cfg_base, flags, entryLo0, entryLo1, r;
-	int error = PCIBIOS_SUCCESSFUL;
+	int error = 0;
 
 	if (device > 19) {
 		*data = 0xffffffff;
@@ -231,7 +231,7 @@ static int write_config_byte(struct pci_bus *bus, unsigned int devfn,
 	if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
 		return -1;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int write_config_word(struct pci_bus *bus, unsigned int devfn,
@@ -248,7 +248,7 @@ static int write_config_word(struct pci_bus *bus, unsigned int devfn,
 	if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
 		return -1;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int write_config_dword(struct pci_bus *bus, unsigned int devfn,
diff --git a/arch/mips/pci/pci-ar2315.c b/arch/mips/pci/pci-ar2315.c
index 490953f51528..2268b63d20e8 100644
--- a/arch/mips/pci/pci-ar2315.c
+++ b/arch/mips/pci/pci-ar2315.c
@@ -260,7 +260,7 @@ static int ar2315_pci_cfg_access(struct ar2315_pci_ctrl *apc, unsigned devfn,
 			    0);
 
 	return isr & AR2315_PCI_INT_ABORT ? PCIBIOS_DEVICE_NOT_FOUND :
-					    PCIBIOS_SUCCESSFUL;
+					    0;
 }
 
 static inline int ar2315_pci_local_cfg_rd(struct ar2315_pci_ctrl *apc,
@@ -311,7 +311,7 @@ static int ar2315_pci_host_setup(struct ar2315_pci_ctrl *apc)
 	u32 id;
 
 	res = ar2315_pci_local_cfg_rd(apc, devfn, PCI_VENDOR_ID, &id);
-	if (res != PCIBIOS_SUCCESSFUL || id != AR2315_PCI_HOST_DEVID)
+	if (res != 0 || id != AR2315_PCI_HOST_DEVID)
 		return -ENODEV;
 
 	/* Program MBARs */
diff --git a/arch/mips/pci/pci-ar71xx.c b/arch/mips/pci/pci-ar71xx.c
index a9f8e7c881bd..4216162858b1 100644
--- a/arch/mips/pci/pci-ar71xx.c
+++ b/arch/mips/pci/pci-ar71xx.c
@@ -182,7 +182,7 @@ static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 	int err;
 	int ret;
 
-	ret = PCIBIOS_SUCCESSFUL;
+	ret = 0;
 	data = ~0;
 
 	err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
@@ -206,7 +206,7 @@ static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 	int ret;
 
 	value = value << (8 * (where & 3));
-	ret = PCIBIOS_SUCCESSFUL;
+	ret = 0;
 
 	err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
 				     AR71XX_PCI_CFG_CMD_WRITE);
diff --git a/arch/mips/pci/pci-ar724x.c b/arch/mips/pci/pci-ar724x.c
index 869d5c9a2f8d..09c607b82cfc 100644
--- a/arch/mips/pci/pci-ar724x.c
+++ b/arch/mips/pci/pci-ar724x.c
@@ -107,7 +107,7 @@ static int ar724x_pci_local_write(struct ar724x_pci_controller *apc,
 	/* flush write */
 	__raw_readl(base + (where & ~3));
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
@@ -154,7 +154,7 @@ static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
 		*value = data;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
@@ -218,7 +218,7 @@ static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
 	/* flush write */
 	__raw_readl(base + (where & ~3));
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops ar724x_pci_ops = {
diff --git a/arch/mips/pci/pci-bcm1480.c b/arch/mips/pci/pci-bcm1480.c
index db0d4d22d46f..614f82cb42d2 100644
--- a/arch/mips/pci/pci-bcm1480.c
+++ b/arch/mips/pci/pci-bcm1480.c
@@ -126,7 +126,7 @@ static int bcm1480_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int bcm1480_pcibios_write(struct pci_bus *bus, unsigned int devfn,
@@ -156,7 +156,7 @@ static int bcm1480_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 
 	WRITECFG32(cfgaddr, data);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops bcm1480_pci_ops = {
diff --git a/arch/mips/pci/pci-bcm1480ht.c b/arch/mips/pci/pci-bcm1480ht.c
index 3d996acd294c..249b54c499b4 100644
--- a/arch/mips/pci/pci-bcm1480ht.c
+++ b/arch/mips/pci/pci-bcm1480ht.c
@@ -115,7 +115,7 @@ static int bcm1480ht_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int bcm1480ht_pcibios_write(struct pci_bus *bus, unsigned int devfn,
@@ -145,7 +145,7 @@ static int bcm1480ht_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 
 	WRITECFG32(cfgaddr, data);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int bcm1480ht_pcibios_get_busno(void)
diff --git a/arch/mips/pci/pci-mt7620.c b/arch/mips/pci/pci-mt7620.c
index d36061603752..669347689d84 100644
--- a/arch/mips/pci/pci-mt7620.c
+++ b/arch/mips/pci/pci-mt7620.c
@@ -162,7 +162,7 @@ static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
@@ -198,7 +198,7 @@ static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
 
 	bridge_w32(data, RALINK_PCI_CONFIG_DATA_VIRT_REG);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops mt7620_pci_ops = {
diff --git a/arch/mips/pci/pci-octeon.c b/arch/mips/pci/pci-octeon.c
index fc29b85cfa92..be6d0bf3aca4 100644
--- a/arch/mips/pci/pci-octeon.c
+++ b/arch/mips/pci/pci-octeon.c
@@ -273,13 +273,13 @@ static int octeon_read_config(struct pci_bus *bus, unsigned int devfn,
 	switch (size) {
 	case 4:
 		*val = le32_to_cpu(cvmx_read64_uint32(pci_addr.u64));
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	case 2:
 		*val = le16_to_cpu(cvmx_read64_uint16(pci_addr.u64));
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	case 1:
 		*val = cvmx_read64_uint8(pci_addr.u64);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 	return PCIBIOS_FUNC_NOT_SUPPORTED;
 }
@@ -307,13 +307,13 @@ static int octeon_write_config(struct pci_bus *bus, unsigned int devfn,
 	switch (size) {
 	case 4:
 		cvmx_write64_uint32(pci_addr.u64, cpu_to_le32(val));
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	case 2:
 		cvmx_write64_uint16(pci_addr.u64, cpu_to_le16(val));
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	case 1:
 		cvmx_write64_uint8(pci_addr.u64, val);
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 	}
 	return PCIBIOS_FUNC_NOT_SUPPORTED;
 }
diff --git a/arch/mips/pci/pci-rt2880.c b/arch/mips/pci/pci-rt2880.c
index e1f12e398136..4f4774c2c777 100644
--- a/arch/mips/pci/pci-rt2880.c
+++ b/arch/mips/pci/pci-rt2880.c
@@ -87,7 +87,7 @@ static int rt2880_pci_config_read(struct pci_bus *bus, unsigned int devfn,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rt2880_pci_config_write(struct pci_bus *bus, unsigned int devfn,
@@ -121,7 +121,7 @@ static int rt2880_pci_config_write(struct pci_bus *bus, unsigned int devfn,
 	rt2880_pci_reg_write(data, RT2880_PCI_REG_CONFIG_DATA);
 	spin_unlock_irqrestore(&rt2880_pci_lock, flags);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops rt2880_pci_ops = {
diff --git a/arch/mips/pci/pci-rt3883.c b/arch/mips/pci/pci-rt3883.c
index 0ac6346026d0..cb160ba7480f 100644
--- a/arch/mips/pci/pci-rt3883.c
+++ b/arch/mips/pci/pci-rt3883.c
@@ -256,7 +256,7 @@ static int rt3883_pci_config_read(struct pci_bus *bus, unsigned int devfn,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int rt3883_pci_config_write(struct pci_bus *bus, unsigned int devfn,
@@ -294,7 +294,7 @@ static int rt3883_pci_config_write(struct pci_bus *bus, unsigned int devfn,
 
 	rt3883_pci_w32(rpc, data, RT3883_PCI_REG_CFGDATA);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops rt3883_pci_ops = {
diff --git a/arch/mips/pci/pci-sb1250.c b/arch/mips/pci/pci-sb1250.c
index c3f82b280484..7f0fd484ef85 100644
--- a/arch/mips/pci/pci-sb1250.c
+++ b/arch/mips/pci/pci-sb1250.c
@@ -135,7 +135,7 @@ static int sb1250_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int sb1250_pcibios_write(struct pci_bus *bus, unsigned int devfn,
@@ -165,7 +165,7 @@ static int sb1250_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 
 	WRITECFG32(cfgaddr, data);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops sb1250_pci_ops = {
diff --git a/arch/mips/pci/pci-virtio-guest.c b/arch/mips/pci/pci-virtio-guest.c
index 40a078bc4617..fb67b009b2cb 100644
--- a/arch/mips/pci/pci-virtio-guest.c
+++ b/arch/mips/pci/pci-virtio-guest.c
@@ -70,7 +70,7 @@ static int pci_virtio_guest_write_config(struct pci_bus *bus,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pci_virtio_guest_read_config(struct pci_bus *bus, unsigned int devfn,
@@ -89,7 +89,7 @@ static int pci_virtio_guest_read_config(struct pci_bus *bus, unsigned int devfn,
 		*val = inl(PCI_CONFIG_DATA);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops pci_virtio_guest_ops = {
diff --git a/arch/mips/pci/pci-xlp.c b/arch/mips/pci/pci-xlp.c
index 9eff9137f78e..75ea7d85913c 100644
--- a/arch/mips/pci/pci-xlp.c
+++ b/arch/mips/pci/pci-xlp.c
@@ -118,7 +118,7 @@ static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 
@@ -145,7 +145,7 @@ static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 
 	pci_cfg_write_32bit(bus, devfn, where, data);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops nlm_pci_ops = {
diff --git a/arch/mips/pci/pci-xlr.c b/arch/mips/pci/pci-xlr.c
index 2a1c81a129ba..b6c72ac170d9 100644
--- a/arch/mips/pci/pci-xlr.c
+++ b/arch/mips/pci/pci-xlr.c
@@ -100,7 +100,7 @@ static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 	else
 		*val = data;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 
@@ -127,7 +127,7 @@ static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 
 	pci_cfg_write_32bit(bus, devfn, where, data);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops nlm_pci_ops = {
diff --git a/arch/mips/pci/pci-xtalk-bridge.c b/arch/mips/pci/pci-xtalk-bridge.c
index 3b2552fb7735..101b18cd8817 100644
--- a/arch/mips/pci/pci-xtalk-bridge.c
+++ b/arch/mips/pci/pci-xtalk-bridge.c
@@ -67,7 +67,7 @@ static int ioc3_cfg_rd(void *addr, int where, int size, u32 *value, u32 sid)
 	mask = 0xffffffffU >> ((4 - size) << 3);
 	*value = (cf >> shift) & mask;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int ioc3_cfg_wr(void *addr, int where, int size, u32 value)
@@ -75,7 +75,7 @@ static int ioc3_cfg_wr(void *addr, int where, int size, u32 value)
 	u32 cf, shift, mask, smask;
 
 	if ((where >= 0x14 && where < 0x40) || (where >= 0x48))
-		return PCIBIOS_SUCCESSFUL;
+		return 0;
 
 	if (get_dbe(cf, (u32 *)addr))
 		return PCIBIOS_DEVICE_NOT_FOUND;
@@ -88,7 +88,7 @@ static int ioc3_cfg_wr(void *addr, int where, int size, u32 value)
 	if (put_dbe(cf, (u32 *)addr))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static void bridge_disable_swapping(struct pci_dev *dev)
@@ -149,7 +149,7 @@ static int pci_conf0_read_config(struct pci_bus *bus, unsigned int devfn,
 	else
 		res = get_dbe(*value, (u32 *)addr);
 
-	return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return res ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static int pci_conf1_read_config(struct pci_bus *bus, unsigned int devfn,
@@ -188,7 +188,7 @@ static int pci_conf1_read_config(struct pci_bus *bus, unsigned int devfn,
 	else
 		res = get_dbe(*value, (u32 *)addr);
 
-	return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+	return res ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static int pci_read_config(struct pci_bus *bus, unsigned int devfn,
@@ -236,7 +236,7 @@ static int pci_conf0_write_config(struct pci_bus *bus, unsigned int devfn,
 	if (res)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pci_conf1_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -277,7 +277,7 @@ static int pci_conf1_write_config(struct pci_bus *bus, unsigned int devfn,
 	if (res)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int pci_write_config(struct pci_bus *bus, unsigned int devfn,
diff --git a/arch/mips/pci/pcie-octeon.c b/arch/mips/pci/pcie-octeon.c
index d919a0d813a1..11e9ed38ca2b 100644
--- a/arch/mips/pci/pcie-octeon.c
+++ b/arch/mips/pci/pcie-octeon.c
@@ -1703,7 +1703,7 @@ static int octeon_pcie_read_config(unsigned int pcie_port, struct pci_bus *bus,
 	if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
 	    OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1))
 		write_c0_cvmmemctl(cvmmemctl_save.u64);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int octeon_pcie0_read_config(struct pci_bus *bus, unsigned int devfn,
@@ -1759,7 +1759,7 @@ static int octeon_pcie_write_config(unsigned int pcie_port, struct pci_bus *bus,
 	default:
 		return PCIBIOS_FUNC_NOT_SUPPORTED;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int octeon_pcie0_write_config(struct pci_bus *bus, unsigned int devfn,
diff --git a/arch/mips/txx9/generic/pci.c b/arch/mips/txx9/generic/pci.c
index fb998726bd5d..bdff45b6b57d 100644
--- a/arch/mips/txx9/generic/pci.c
+++ b/arch/mips/txx9/generic/pci.c
@@ -62,7 +62,7 @@ int __init txx9_pci66_check(struct pci_controller *hose, int top_bus,
 			continue;
 		if (early_read_config_word(hose, top_bus, current_bus,
 					   pci_devfn, PCI_VENDOR_ID, &vid) !=
-		    PCIBIOS_SUCCESSFUL)
+		    0)
 			continue;
 		if (vid == 0xffff)
 			continue;
@@ -346,7 +346,7 @@ static void final_fixup(struct pci_dev *dev)
 	unsigned char bist;
 
 	/* Do build-in self test */
-	if (pci_read_config_byte(dev, PCI_BIST, &bist) == PCIBIOS_SUCCESSFUL &&
+	if (pci_read_config_byte(dev, PCI_BIST, &bist) == 0 &&
 	    (bist & PCI_BIST_CAPABLE)) {
 		unsigned long timeout;
 		pci_set_power_state(dev, PCI_D0);
-- 
2.18.2

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 29/35] mips: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (27 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 28/35] mips: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 30/35] microblaze: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (7 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Thomas Bogendoerfer
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-mips, linux-pci,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 28/35

 arch/mips/pci/ops-bcm63xx.c  | 2 +-
 arch/mips/pci/pci-ar2315.c   | 5 ++---
 arch/mips/txx9/generic/pci.c | 3 +--
 3 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/mips/pci/ops-bcm63xx.c b/arch/mips/pci/ops-bcm63xx.c
index 3e88e4869f37..f2810af4fa24 100644
--- a/arch/mips/pci/ops-bcm63xx.c
+++ b/arch/mips/pci/ops-bcm63xx.c
@@ -295,7 +295,7 @@ static int fake_cb_bridge_write(int where, int size, u32 val)
 	int ret;
 
 	ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
-	if (ret != 0)
+	if (ret)
 		return ret;
 
 	data = preprocess_write(data, val, where, size);
diff --git a/arch/mips/pci/pci-ar2315.c b/arch/mips/pci/pci-ar2315.c
index 2268b63d20e8..c2b9e62fbc18 100644
--- a/arch/mips/pci/pci-ar2315.c
+++ b/arch/mips/pci/pci-ar2315.c
@@ -259,8 +259,7 @@ static int ar2315_pci_cfg_access(struct ar2315_pci_ctrl *apc, unsigned devfn,
 	ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_CFG_SEL,
 			    0);
 
-	return isr & AR2315_PCI_INT_ABORT ? PCIBIOS_DEVICE_NOT_FOUND :
-					    0;
+	return isr & AR2315_PCI_INT_ABORT ? PCIBIOS_DEVICE_NOT_FOUND : 0;
 }
 
 static inline int ar2315_pci_local_cfg_rd(struct ar2315_pci_ctrl *apc,
@@ -311,7 +310,7 @@ static int ar2315_pci_host_setup(struct ar2315_pci_ctrl *apc)
 	u32 id;
 
 	res = ar2315_pci_local_cfg_rd(apc, devfn, PCI_VENDOR_ID, &id);
-	if (res != 0 || id != AR2315_PCI_HOST_DEVID)
+	if (res || id != AR2315_PCI_HOST_DEVID)
 		return -ENODEV;
 
 	/* Program MBARs */
diff --git a/arch/mips/txx9/generic/pci.c b/arch/mips/txx9/generic/pci.c
index bdff45b6b57d..9da38f8fa036 100644
--- a/arch/mips/txx9/generic/pci.c
+++ b/arch/mips/txx9/generic/pci.c
@@ -61,8 +61,7 @@ int __init txx9_pci66_check(struct pci_controller *hose, int top_bus,
 		if (PCI_FUNC(pci_devfn))
 			continue;
 		if (early_read_config_word(hose, top_bus, current_bus,
-					   pci_devfn, PCI_VENDOR_ID, &vid) !=
-		    0)
+					   pci_devfn, PCI_VENDOR_ID, &vid))
 			continue;
 		if (vid == 0xffff)
 			continue;
-- 
2.18.2

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 30/35] microblaze: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (28 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 29/35] mips: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 31/35] m68k: " Saheed O. Bolarinwa
                   ` (6 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Michal Simek
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-pci, linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/microblaze/pci/indirect_pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/microblaze/pci/indirect_pci.c b/arch/microblaze/pci/indirect_pci.c
index 1caf7d3e0eef..1f04a1f2c30b 100644
--- a/arch/microblaze/pci/indirect_pci.c
+++ b/arch/microblaze/pci/indirect_pci.c
@@ -65,7 +65,7 @@ indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 		*val = in_le32(cfg_data);
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -132,7 +132,7 @@ indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops indirect_pci_ops = {
-- 
2.18.2

_______________________________________________
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 31/35] m68k: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (29 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 30/35] microblaze: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 32/35] arm/PCI: " Saheed O. Bolarinwa
                   ` (5 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Greg Ungerer, Geert Uytterhoeven
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-m68k, linux-pci,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/m68k/coldfire/pci.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/m68k/coldfire/pci.c b/arch/m68k/coldfire/pci.c
index 84eab0f5e00a..ecd11a19487a 100644
--- a/arch/m68k/coldfire/pci.c
+++ b/arch/m68k/coldfire/pci.c
@@ -64,7 +64,7 @@ static int mcf_pci_readconfig(struct pci_bus *bus, unsigned int devfn,
 
 	if (bus->number == 0) {
 		if (mcf_host_slot2sid[PCI_SLOT(devfn)] == 0)
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 	}
 
 	addr = mcf_mk_pcicar(bus->number, devfn, where);
@@ -86,7 +86,7 @@ static int mcf_pci_readconfig(struct pci_bus *bus, unsigned int devfn,
 
 	__raw_writel(0, PCICAR);
 	__raw_readl(PCICAR);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int mcf_pci_writeconfig(struct pci_bus *bus, unsigned int devfn,
@@ -96,7 +96,7 @@ static int mcf_pci_writeconfig(struct pci_bus *bus, unsigned int devfn,
 
 	if (bus->number == 0) {
 		if (mcf_host_slot2sid[PCI_SLOT(devfn)] == 0)
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 	}
 
 	addr = mcf_mk_pcicar(bus->number, devfn, where);
@@ -118,7 +118,7 @@ static int mcf_pci_writeconfig(struct pci_bus *bus, unsigned int devfn,
 
 	__raw_writel(0, PCICAR);
 	__raw_readl(PCICAR);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static struct pci_ops mcf_pci_ops = {
-- 
2.18.2

_______________________________________________
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 32/35] arm/PCI: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (30 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 31/35] m68k: " Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 33/35] arm/PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (4 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Russell King
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-pci, linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/arm/common/it8152.c           | 4 ++--
 arch/arm/mach-cns3xxx/pcie.c       | 2 +-
 arch/arm/mach-footbridge/dc21285.c | 4 ++--
 arch/arm/mach-iop32x/pci.c         | 6 +++---
 arch/arm/mach-ixp4xx/common-pci.c  | 8 ++++----
 arch/arm/mach-orion5x/pci.c        | 4 ++--
 arch/arm/plat-orion/pcie.c         | 8 ++++----
 7 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/arm/common/it8152.c b/arch/arm/common/it8152.c
index 9ec740cac469..331911b627c4 100644
--- a/arch/arm/common/it8152.c
+++ b/arch/arm/common/it8152.c
@@ -186,7 +186,7 @@ static int it8152_pci_read_config(struct pci_bus *bus,
 
 	*value = v;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int it8152_pci_write_config(struct pci_bus *bus,
@@ -216,7 +216,7 @@ static int it8152_pci_write_config(struct pci_bus *bus,
 	__raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
 	__raw_writel((v | vtemp), IT8152_PCI_CFG_DATA);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops it8152_ops = {
diff --git a/arch/arm/mach-cns3xxx/pcie.c b/arch/arm/mach-cns3xxx/pcie.c
index e92fbd679dfb..7020071a2dc5 100644
--- a/arch/arm/mach-cns3xxx/pcie.c
+++ b/arch/arm/mach-cns3xxx/pcie.c
@@ -92,7 +92,7 @@ static int cns3xxx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 
 	ret = pci_generic_config_read(bus, devfn, where, size, val);
 
-	if (ret == PCIBIOS_SUCCESSFUL && !bus->number && !devfn &&
+	if (ret == 0 && !bus->number && !devfn &&
 	    (where & 0xffc) == PCI_CLASS_REVISION)
 		/*
 		 * RC's class is 0xb, but Linux PCI driver needs 0x604
diff --git a/arch/arm/mach-footbridge/dc21285.c b/arch/arm/mach-footbridge/dc21285.c
index 416462e3f5d6..5ad78b38c659 100644
--- a/arch/arm/mach-footbridge/dc21285.c
+++ b/arch/arm/mach-footbridge/dc21285.c
@@ -86,7 +86,7 @@ dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		return -1;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -121,7 +121,7 @@ dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		return -1;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops dc21285_ops = {
diff --git a/arch/arm/mach-iop32x/pci.c b/arch/arm/mach-iop32x/pci.c
index ab0010dc3145..a29d33ce20c8 100644
--- a/arch/arm/mach-iop32x/pci.c
+++ b/arch/arm/mach-iop32x/pci.c
@@ -118,7 +118,7 @@ iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 
 	*value = val;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -131,7 +131,7 @@ iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 	if (size != 4) {
 		val = iop3xx_read(addr);
 		if (iop3xx_pci_status())
-			return PCIBIOS_SUCCESSFUL;
+			return 0;
 
 		where = (where & 3) * 8;
 
@@ -154,7 +154,7 @@ iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 			  "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops iop3xx_ops = {
diff --git a/arch/arm/mach-ixp4xx/common-pci.c b/arch/arm/mach-ixp4xx/common-pci.c
index 893c19c254e3..f7cd535d4971 100644
--- a/arch/arm/mach-ixp4xx/common-pci.c
+++ b/arch/arm/mach-ixp4xx/common-pci.c
@@ -208,7 +208,7 @@ static int local_read_config(int where, int size, u32 *value)
 	crp_read(where & ~3, &data);
 	*value = (data >> (8*n)) & bytemask[size];
 	pr_debug("local_read_config read %#x\n", *value);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int local_write_config(int where, int size, u32 value)
@@ -221,7 +221,7 @@ static int local_write_config(int where, int size, u32 value)
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	data = value << (8*n);
 	crp_write((where & ~3) | byte_enables, data);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static u32 byte_lane_enable_bits(u32 n, int size)
@@ -255,7 +255,7 @@ static int ixp4xx_pci_read_config(struct pci_bus *bus, unsigned int devfn, int w
 
 	*value = (data >> (8*n)) & bytemask[size];
 	pr_debug("read_config_byte read %#x\n", *value);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int ixp4xx_pci_write_config(struct pci_bus *bus,  unsigned int devfn, int where, int size, u32 value)
@@ -276,7 +276,7 @@ static int ixp4xx_pci_write_config(struct pci_bus *bus,  unsigned int devfn, int
 	if (ixp4xx_pci_write(addr, byte_enables | NP_CMD_CONFIGWRITE, data))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops ixp4xx_ops = {
diff --git a/arch/arm/mach-orion5x/pci.c b/arch/arm/mach-orion5x/pci.c
index 76951bfbacf5..2b587225e244 100644
--- a/arch/arm/mach-orion5x/pci.c
+++ b/arch/arm/mach-orion5x/pci.c
@@ -289,14 +289,14 @@ static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
 
 	spin_unlock_irqrestore(&orion5x_pci_lock, flags);
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
 					u32 where, u32 size, u32 val)
 {
 	unsigned long flags;
-	int ret = PCIBIOS_SUCCESSFUL;
+	int ret = 0;
 
 	spin_lock_irqsave(&orion5x_pci_lock, flags);
 
diff --git a/arch/arm/plat-orion/pcie.c b/arch/arm/plat-orion/pcie.c
index 8b8c06d2e9c4..6fb142f893ac 100644
--- a/arch/arm/plat-orion/pcie.c
+++ b/arch/arm/plat-orion/pcie.c
@@ -221,7 +221,7 @@ int orion_pcie_rd_conf(void __iomem *base, struct pci_bus *bus,
 	else if (size == 2)
 		*val = (*val >> (8 * (where & 3))) & 0xffff;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 int orion_pcie_rd_conf_tlp(void __iomem *base, struct pci_bus *bus,
@@ -244,7 +244,7 @@ int orion_pcie_rd_conf_tlp(void __iomem *base, struct pci_bus *bus,
 	else if (size == 2)
 		*val = (*val >> (8 * (where & 3))) & 0xffff;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 int orion_pcie_rd_conf_wa(void __iomem *wa_base, struct pci_bus *bus,
@@ -260,13 +260,13 @@ int orion_pcie_rd_conf_wa(void __iomem *wa_base, struct pci_bus *bus,
 	else if (size == 2)
 		*val = (*val >> (8 * (where & 3))) & 0xffff;
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 int orion_pcie_wr_conf(void __iomem *base, struct pci_bus *bus,
 		       u32 devfn, int where, int size, u32 val)
 {
-	int ret = PCIBIOS_SUCCESSFUL;
+	int ret = 0;
 
 	writel(PCIE_CONF_BUS(bus->number) |
 		PCIE_CONF_DEV(PCI_SLOT(devfn)) |
-- 
2.18.2

_______________________________________________
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 33/35] arm/PCI: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (31 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 32/35] arm/PCI: " Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 34/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
                   ` (3 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Russell King
  Cc: Saheed O. Bolarinwa, linux-kernel, linux-pci, linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on PATCH 32/35

 arch/arm/mach-cns3xxx/pcie.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-cns3xxx/pcie.c b/arch/arm/mach-cns3xxx/pcie.c
index 7020071a2dc5..c249d4cbf4f0 100644
--- a/arch/arm/mach-cns3xxx/pcie.c
+++ b/arch/arm/mach-cns3xxx/pcie.c
@@ -92,7 +92,7 @@ static int cns3xxx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 
 	ret = pci_generic_config_read(bus, devfn, where, size, val);
 
-	if (ret == 0 && !bus->number && !devfn &&
+	if (!ret && !bus->number && !devfn &&
 	    (where & 0xffc) == PCI_CLASS_REVISION)
 		/*
 		 * RC's class is 0xb, but Linux PCI driver needs 0x604
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 34/35] PCI: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (32 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 33/35] arm/PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 35/35] alpha: Tidy Success/Failure checks Saheed O. Bolarinwa
                   ` (2 subsequent siblings)
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Richard Henderson, Ivan Kokshaysky, Matt Turner
  Cc: Saheed O. Bolarinwa, linux-pci, linux-kernel, linux-alpha,
	linux-kernel-mentees

In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
Their scope should be limited within arch/x86.

Change all PCIBIOS_SUCCESSFUL to 0

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
 arch/alpha/kernel/core_apecs.c    | 4 ++--
 arch/alpha/kernel/core_cia.c      | 4 ++--
 arch/alpha/kernel/core_irongate.c | 4 ++--
 arch/alpha/kernel/core_lca.c      | 4 ++--
 arch/alpha/kernel/core_marvel.c   | 4 ++--
 arch/alpha/kernel/core_mcpcia.c   | 4 ++--
 arch/alpha/kernel/core_polaris.c  | 4 ++--
 arch/alpha/kernel/core_t2.c       | 4 ++--
 arch/alpha/kernel/core_titan.c    | 4 ++--
 arch/alpha/kernel/core_tsunami.c  | 4 ++--
 arch/alpha/kernel/core_wildfire.c | 4 ++--
 arch/alpha/kernel/sys_miata.c     | 2 +-
 12 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/arch/alpha/kernel/core_apecs.c b/arch/alpha/kernel/core_apecs.c
index 6df765ff2b10..d74d78d92434 100644
--- a/arch/alpha/kernel/core_apecs.c
+++ b/arch/alpha/kernel/core_apecs.c
@@ -287,7 +287,7 @@ apecs_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 	shift = (where & 3) * 8;
 	addr = (pci_addr << 5) + mask + APECS_CONF;
 	*value = conf_read(addr, type1) >> (shift);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -304,7 +304,7 @@ apecs_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 	mask = (size - 1) * 8;
 	addr = (pci_addr << 5) + mask + APECS_CONF;
 	conf_write(addr, value << ((where & 3) * 8), type1);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops apecs_pci_ops = 
diff --git a/arch/alpha/kernel/core_cia.c b/arch/alpha/kernel/core_cia.c
index f489170201c3..25300bc19c48 100644
--- a/arch/alpha/kernel/core_cia.c
+++ b/arch/alpha/kernel/core_cia.c
@@ -221,7 +221,7 @@ cia_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
 	shift = (where & 3) * 8;
 	addr = (pci_addr << 5) + mask + CIA_CONF;
 	*value = conf_read(addr, type1) >> (shift);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int 
@@ -238,7 +238,7 @@ cia_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
 	mask = (size - 1) * 8;
 	addr = (pci_addr << 5) + mask + CIA_CONF;
 	conf_write(addr, value << ((where & 3) * 8), type1);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops cia_pci_ops = 
diff --git a/arch/alpha/kernel/core_irongate.c b/arch/alpha/kernel/core_irongate.c
index a9fd133a7fb2..858a2293c786 100644
--- a/arch/alpha/kernel/core_irongate.c
+++ b/arch/alpha/kernel/core_irongate.c
@@ -121,7 +121,7 @@ irongate_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -152,7 +152,7 @@ irongate_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops irongate_pci_ops =
diff --git a/arch/alpha/kernel/core_lca.c b/arch/alpha/kernel/core_lca.c
index 57e0750419f2..a7a00d73e2c5 100644
--- a/arch/alpha/kernel/core_lca.c
+++ b/arch/alpha/kernel/core_lca.c
@@ -213,7 +213,7 @@ lca_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 	mask = (size - 1) * 8;
 	addr = (pci_addr << 5) + mask + LCA_CONF;
 	*value = conf_read(addr) >> (shift);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int 
@@ -229,7 +229,7 @@ lca_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
 	mask = (size - 1) * 8;
 	addr = (pci_addr << 5) + mask + LCA_CONF;
 	conf_write(addr, value << ((where & 3) * 8));
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops lca_pci_ops = 
diff --git a/arch/alpha/kernel/core_marvel.c b/arch/alpha/kernel/core_marvel.c
index 1db9d0eb2922..c076b97a9961 100644
--- a/arch/alpha/kernel/core_marvel.c
+++ b/arch/alpha/kernel/core_marvel.c
@@ -561,7 +561,7 @@ marvel_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		return PCIBIOS_FUNC_NOT_SUPPORTED;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -593,7 +593,7 @@ marvel_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		return PCIBIOS_FUNC_NOT_SUPPORTED;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops marvel_pci_ops =
diff --git a/arch/alpha/kernel/core_mcpcia.c b/arch/alpha/kernel/core_mcpcia.c
index 74b1d018124c..fdb6d055bcc0 100644
--- a/arch/alpha/kernel/core_mcpcia.c
+++ b/arch/alpha/kernel/core_mcpcia.c
@@ -216,7 +216,7 @@ mcpcia_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		*value = w;
 		break;
 	}
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int
@@ -233,7 +233,7 @@ mcpcia_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 	addr |= (size - 1) * 8;
 	value = __kernel_insql(value, where & 3);
 	conf_write(addr, value, type1, hose);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops mcpcia_pci_ops = 
diff --git a/arch/alpha/kernel/core_polaris.c b/arch/alpha/kernel/core_polaris.c
index 75d622d96ff2..345b9d5a116f 100644
--- a/arch/alpha/kernel/core_polaris.c
+++ b/arch/alpha/kernel/core_polaris.c
@@ -102,7 +102,7 @@ polaris_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 
@@ -134,7 +134,7 @@ polaris_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops polaris_pci_ops = 
diff --git a/arch/alpha/kernel/core_t2.c b/arch/alpha/kernel/core_t2.c
index 98d5b6ff8a76..0bbf9b028c11 100644
--- a/arch/alpha/kernel/core_t2.c
+++ b/arch/alpha/kernel/core_t2.c
@@ -296,7 +296,7 @@ t2_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 	shift = (where & 3) * 8;
 	addr = (pci_addr << 5) + mask + T2_CONF;
 	*value = conf_read(addr, type1) >> (shift);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int 
@@ -313,7 +313,7 @@ t2_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
 	mask = (size - 1) * 8;
 	addr = (pci_addr << 5) + mask + T2_CONF;
 	conf_write(addr, value << ((where & 3) * 8), type1);
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops t2_pci_ops = 
diff --git a/arch/alpha/kernel/core_titan.c b/arch/alpha/kernel/core_titan.c
index 2a2820fb1be6..aac94708a226 100644
--- a/arch/alpha/kernel/core_titan.c
+++ b/arch/alpha/kernel/core_titan.c
@@ -158,7 +158,7 @@ titan_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int 
@@ -189,7 +189,7 @@ titan_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops titan_pci_ops = 
diff --git a/arch/alpha/kernel/core_tsunami.c b/arch/alpha/kernel/core_tsunami.c
index fc1ab73f23de..88fe80a8b41a 100644
--- a/arch/alpha/kernel/core_tsunami.c
+++ b/arch/alpha/kernel/core_tsunami.c
@@ -134,7 +134,7 @@ tsunami_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int 
@@ -165,7 +165,7 @@ tsunami_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops tsunami_pci_ops = 
diff --git a/arch/alpha/kernel/core_wildfire.c b/arch/alpha/kernel/core_wildfire.c
index e8d3b033018d..012ec2f5b675 100644
--- a/arch/alpha/kernel/core_wildfire.c
+++ b/arch/alpha/kernel/core_wildfire.c
@@ -400,7 +400,7 @@ wildfire_read_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 static int 
@@ -431,7 +431,7 @@ wildfire_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 		break;
 	}
 
-	return PCIBIOS_SUCCESSFUL;
+	return 0;
 }
 
 struct pci_ops wildfire_pci_ops = 
diff --git a/arch/alpha/kernel/sys_miata.c b/arch/alpha/kernel/sys_miata.c
index e1bee8f84c58..1b4c03ac34d8 100644
--- a/arch/alpha/kernel/sys_miata.c
+++ b/arch/alpha/kernel/sys_miata.c
@@ -185,7 +185,7 @@ miata_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 	if((slot == 7) && (PCI_FUNC(dev->devfn) == 3)) {
 		u8 irq=0;
 		struct pci_dev *pdev = pci_get_slot(dev->bus, dev->devfn & ~7);
-		if(pdev == NULL || pci_read_config_byte(pdev, 0x40,&irq) != PCIBIOS_SUCCESSFUL) {
+		if (pdev == NULL || pci_read_config_byte(pdev, 0x40, &irq) != 0) {
 			pci_dev_put(pdev);
 			return -1;
 		}
-- 
2.18.2

_______________________________________________
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https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

^ permalink raw reply	[flat|nested] 72+ messages in thread

* [Linux-kernel-mentees] [RFC PATCH 35/35] alpha: Tidy Success/Failure checks
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (33 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 34/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 12:22 ` Saheed O. Bolarinwa
  2020-07-13 15:08 ` [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Arnd Bergmann
  2020-07-13 22:01 ` Bjorn Helgaas
  36 siblings, 0 replies; 72+ messages in thread
From: Saheed O. Bolarinwa @ 2020-07-13 12:22 UTC (permalink / raw)
  To: helgaas, Richard Henderson, Ivan Kokshaysky, Matt Turner
  Cc: Saheed O. Bolarinwa, linux-pci, linux-kernel, linux-alpha,
	linux-kernel-mentees

Remove unnecessary check for 0.

Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
---
This patch depends on 34/35

 arch/alpha/kernel/sys_miata.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/alpha/kernel/sys_miata.c b/arch/alpha/kernel/sys_miata.c
index 1b4c03ac34d8..539f803c1614 100644
--- a/arch/alpha/kernel/sys_miata.c
+++ b/arch/alpha/kernel/sys_miata.c
@@ -185,7 +185,7 @@ miata_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 	if((slot == 7) && (PCI_FUNC(dev->devfn) == 3)) {
 		u8 irq=0;
 		struct pci_dev *pdev = pci_get_slot(dev->bus, dev->devfn & ~7);
-		if (pdev == NULL || pci_read_config_byte(pdev, 0x40, &irq) != 0) {
+		if (pdev == NULL || pci_read_config_byte(pdev, 0x40, &irq)) {
 			pci_dev_put(pdev);
 			return -1;
 		}
-- 
2.18.2

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 12/35] r8169: Tidy Success/Failure checks
  2020-07-13 13:45   ` Heiner Kallweit
@ 2020-07-13 13:09     ` Saheed Bolarinwa
  0 siblings, 0 replies; 72+ messages in thread
From: Saheed Bolarinwa @ 2020-07-13 13:09 UTC (permalink / raw)
  To: Heiner Kallweit, helgaas, Realtek linux nic maintainers,
	David S. Miller, Jakub Kicinski, Russell King
  Cc: linux-pci, linux-kernel, netdev, linux-kernel-mentees

Thank you for the review.

On 7/13/20 3:45 PM, Heiner Kallweit wrote:
>
> Patches 11 and 12 are both trivial, wouldn't it make sense to merge them?
> Apart from that: Acked-by: Heiner Kallweit <hkallweit1@gmail.com>

I separated them for easy review, I will merge them in the next version.

- Saheed

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 12/35] r8169: Tidy Success/Failure checks
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 12/35] r8169: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 13:45   ` Heiner Kallweit
  2020-07-13 13:09     ` Saheed Bolarinwa
  0 siblings, 1 reply; 72+ messages in thread
From: Heiner Kallweit @ 2020-07-13 13:45 UTC (permalink / raw)
  To: Saheed O. Bolarinwa, helgaas, Realtek linux nic maintainers,
	David S. Miller, Jakub Kicinski, Russell King
  Cc: linux-pci, linux-kernel, netdev, linux-kernel-mentees

On 13.07.2020 14:22, Saheed O. Bolarinwa wrote:
> Remove unnecessary check for 0.
> 
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
> ---
> This patch depends on PATCH 11/35
> 
>  drivers/net/ethernet/realtek/r8169_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 206dac958cb2..79edbc0c4476 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -2656,7 +2656,7 @@ static void rtl_csi_access_enable(struct rtl8169_private *tp, u8 val)
>  	 * first and if it fails fall back to CSI.
>  	 */
>  	if (pdev->cfg_size > 0x070f &&
> -	    pci_write_config_byte(pdev, 0x070f, val) == 0)
> +	    !pci_write_config_byte(pdev, 0x070f, val))
>  		return;
>  
>  	netdev_notice_once(tp->dev,
> 
Patches 11 and 12 are both trivial, wouldn't it make sense to merge them?
Apart from that: Acked-by: Heiner Kallweit <hkallweit1@gmail.com>
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 06/35] PCI: Tidy Success/Failure checks
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 06/35] PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 13:59   ` Gustavo Pimentel
  0 siblings, 0 replies; 72+ messages in thread
From: Gustavo Pimentel @ 2020-07-13 13:59 UTC (permalink / raw)
  To: Saheed O. Bolarinwa, helgaas, Lorenzo Pieralisi, Rob Herring,
	Ley Foon Tan, Marek Vasut, Yoshihiro Shimoda, Ray Jui,
	Scott Branden, bcm-kernel-feedback-list, Toan Le, Jingoo Han,
	Yue Wang, Kevin Hilman, Philipp Zabel
  Cc: linux-pci, linux-kernel, rfi, linux-renesas-soc, linux-amlogic,
	linux-kernel-mentees, linux-arm-kernel

On Mon, Jul 13, 2020 at 13:22:18, Saheed O. Bolarinwa 
<refactormyself@gmail.com> wrote:

> Remove unnecessary check for 0.
> 
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
> ---
> This patch depends on PATCH 05/35
> 
>  drivers/pci/controller/dwc/pci-meson.c            | 2 +-
>  drivers/pci/controller/dwc/pcie-designware-host.c | 2 +-
>  drivers/pci/controller/pci-xgene.c                | 3 +--
>  drivers/pci/controller/pcie-altera.c              | 4 ++--
>  drivers/pci/controller/pcie-iproc.c               | 2 +-
>  drivers/pci/controller/pcie-rcar-host.c           | 4 ++--
>  6 files changed, 8 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
> index 58142f03d300..8203d5f95d28 100644
> --- a/drivers/pci/controller/dwc/pci-meson.c
> +++ b/drivers/pci/controller/dwc/pci-meson.c
> @@ -390,7 +390,7 @@ static int meson_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
>  	int ret;
>  
>  	ret = dw_pcie_read(pci->dbi_base + where, size, val);
> -	if (ret != 0)
> +	if (ret)
>  		return ret;
>  
>  	/*
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 7c97c54f787c..2dd3965365f6 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -459,7 +459,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  	}
>  
>  	ret = dw_pcie_rd_own_conf(pp, PCI_HEADER_TYPE, 1, &hdr_type);
> -	if (ret != 0) {
> +	if (ret) {
>  		dev_err(pci->dev, "Failed reading PCI_HEADER_TYPE cfg space reg (ret: 0x%x)\n",
>  			ret);
>  		ret = pcibios_err_to_errno(ret);
> diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c
> index bf74f0a8b451..8d55cfc4ff8a 100644
> --- a/drivers/pci/controller/pci-xgene.c
> +++ b/drivers/pci/controller/pci-xgene.c
> @@ -167,8 +167,7 @@ static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
>  {
>  	struct xgene_pcie_port *port = pcie_bus_to_port(bus);
>  
> -	if (pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val) !=
> -	    0)
> +	if (pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val))
>  		return PCIBIOS_DEVICE_NOT_FOUND;
>  
>  	/*
> diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
> index 96f5bda32b58..9f7b12ad0c04 100644
> --- a/drivers/pci/controller/pcie-altera.c
> +++ b/drivers/pci/controller/pcie-altera.c
> @@ -367,7 +367,7 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
>  						    value, false);
>  
>  	ret = pcie->pcie_data->ops->tlp_read_pkt(pcie, NULL);
> -	if (ret != 0)
> +	if (ret)
>  		return ret;
>  
>  	/*
> @@ -453,7 +453,7 @@ static int _altera_pcie_cfg_read(struct altera_pcie *pcie, u8 busno,
>  
>  	ret = tlp_cfg_dword_read(pcie, busno, devfn,
>  				 (where & ~DWORD_MASK), byte_en, &data);
> -	if (ret != 0)
> +	if (ret)
>  		return ret;
>  
>  	switch (size) {
> diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
> index dac9352c0cb2..d34c9457fbe4 100644
> --- a/drivers/pci/controller/pcie-iproc.c
> +++ b/drivers/pci/controller/pcie-iproc.c
> @@ -584,7 +584,7 @@ static int iproc_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
>  	/* root complex access */
>  	if (busno == 0) {
>  		ret = pci_generic_config_read32(bus, devfn, where, size, val);
> -		if (ret == 0)
> +		if (!ret)
>  			iproc_pcie_fix_cap(pcie, where, val);
>  
>  		return ret;
> diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
> index 363a8630de28..2bb250c6f767 100644
> --- a/drivers/pci/controller/pcie-rcar-host.c
> +++ b/drivers/pci/controller/pcie-rcar-host.c
> @@ -157,7 +157,7 @@ static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
>  
>  	ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
>  				      bus, devfn, where, val);
> -	if (ret != 0) {
> +	if (ret) {
>  		*val = 0xffffffff;
>  		return ret;
>  	}
> @@ -184,7 +184,7 @@ static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
>  
>  	ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
>  				      bus, devfn, where, &data);
> -	if (ret != 0)
> +	if (ret)
>  		return ret;
>  
>  	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
> -- 
> 2.18.2

Seems harmless to me.



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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (34 preceding siblings ...)
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 35/35] alpha: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-13 15:08 ` Arnd Bergmann
  2020-07-14 18:45   ` Bjorn Helgaas
  2020-07-13 22:01 ` Bjorn Helgaas
  36 siblings, 1 reply; 72+ messages in thread
From: Arnd Bergmann @ 2020-07-13 15:08 UTC (permalink / raw)
  To: Saheed O. Bolarinwa
  Cc: Rich Felker, Martin K. Petersen, Linux-sh list, linux-pci,
	linux-nvme, Yicong Yang, sparclinux,
	Realtek linux nic maintainers, Paul Mackerras, Linux I2C,
	bcm-kernel-feedback-list, Bjorn Helgaas, rfi, Toan Le,
	Greg Ungerer, Marek Vasut, Rob Herring, Stefano Stabellini,
	Sagi Grimberg, Yoshinori Sato, linux-scsi, Michael Ellerman,
	linux-atm-general, Russell King, Ley Foon Tan, Christoph Hellwig,
	Geert Uytterhoeven, Rafał Miłecki, Chas Williams,
	Benjamin Herrenschmidt, xen-devel, Matt Turner,
	open list:BROADCOM NVRAM DRIVER, linux-kernel-mentees,
	Kevin Hilman, Guenter Roeck, linux-hwmon, Jean Delvare,
	Andrew Donnellan, Ray Jui, James E.J. Bottomley, Linux-Renesas,
	Yue Wang, Jens Axboe, Jakub Kicinski, linux-m68k,
	Lorenzo Pieralisi, Ivan Kokshaysky, Michael Buesch,
	open list:ARM/Amlogic Meson SoC support, Boris Ostrovsky,
	Guan Xuetao, Linux ARM, Richard Henderson, Juergen Gross,
	Michal Simek, Thomas Bogendoerfer, Scott Branden, Bjorn Helgaas,
	Jingoo Han, Networking, Yoshihiro Shimoda, linux-wireless,
	linux-kernel, Keith Busch, Brian King, Philipp Zabel, alpha,
	Frederic Barrat, Gustavo Pimentel, linuxppc-dev, David S. Miller,
	Heiner Kallweit

On Mon, Jul 13, 2020 at 3:22 PM Saheed O. Bolarinwa
<refactormyself@gmail.com> wrote:
> This goal of these series is to move the definition of *all* PCIBIOS* from
> include/linux/pci.h to arch/x86 and limit their use within there.
> All other tree specific definition will be left for intact. Maybe they can
> be renamed.
>
> PCIBIOS* is an x86 concept as defined by the PCI spec. The returned error
> codes of PCIBIOS* are positive values and this introduces some complexities
> which other archs need not incur.

I think the intention is good, but I find the series in its current
form very hard
to review, in particular the way you touch some functions three times with
trivial changes. Instead of

1) replace PCIBIOS_SUCCESSFUL with 0
2) drop pointless 0-comparison
3) reformat whitespace

I would suggest to combine the first two steps into one patch per
subsystem and drop the third step.

> PLAN:
>
> 1.   [PATCH v0 1-36] Replace all PCIBIOS_SUCCESSFUL with 0
>
> 2a.  Audit all functions returning PCIBIOS_* error values directly or
>      indirectly and prevent possible bug coming in (2b)
>
> 2b.  Make all functions returning PCIBIOS_* error values call
>      pcibios_err_to_errno(). *This will change their behaviour, for good.*
>
> 3.   Clone a pcibios_err_to_errno() into arch/x86/pci/pcbios.c as _v2.
>      This handles the positive error codes directly and will not use any
>      PCIBIOS* definitions. So calls to it have no outside dependence.
>
> 4.   Make all x86 codes that needs to convert to -E* values call the
>      cloned version - pcibios_err_to_errno_v2()
>
> 5.   Assign PCIBIOS_* errors values directly to generic -E* errors
>
> 6.   Refactor pcibios_err_to_errno() and mark it deprecated
>
> 7.   Replace all calls to pcibios_err_to_errno() with the proper -E* value
>      or 0.
>
> 8.   Remove all PCIBIOS* definitions in include/linux/pci.h and
>      pcibios_err_to_errno() too.
>
> 9.   Redefine all PCIBIOS* definitions with original values inside
>      arch/x86/pci/pcbios.c
>
> 10.  Redefine pcibios_err_to_errno() inside arch/x86/pci/pcbios.c
>
> 11.  Replace pcibios_err_to_errno_v2() calls with pcibios_err_to_errno()
>
> 12.  Remove pcibios_err_to_errno_v2()
>
> Suggested-by: Bjorn Helgaas <bjorn@helgaas.com>
> Suggested-by: Yicong Yang <yangyicong@hisilicon.com>
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>

I would hope that there is a simpler procedure to get to good
code than 12 steps that rename the same things multiple times.

Maybe the work can be split up differently, with a similar end result
but fewer and easier reviewed patches. The way I'd look at the
problem, there are three main areas that can be dealt with one at
a time:

a) callers of the high-level config space accessors
   pci_{write,read}_config_{byte,word,dword}, mostly in device
   drivers.
b) low-level implementation of the config space accessors
    through struct pci_ops
c) all other occurrences of these constants

Starting with a), my first question is whether any high-level drivers
even need to care about errors from these functions. I see 4913
callers that ignore the return code, and 576 that actually
check it, and almost none care about the specific error (as you
found as well). Unless we conclude that most PCI drivers are
wrong, could we just change the return type to 'void' and assume
they never fail for valid arguments on a valid pci_device* ?

For b), it might be nice to also change other aspects of the interface,
e.g. passing a pci_host_bridge pointer plus bus number instead of
a pci_bus pointer, or having the callback in the pci_host_bridge
structure.

> Bolarinwa Olayemi Saheed (35):
>   Change PCIBIOS_SUCCESSFUL to 0
>   Change PCIBIOS_SUCCESSFUL to 0
>   Change PCIBIOS_SUCCESSFUL to 0
>   Tidy Success/Failure checks
>   Change PCIBIOS_SUCCESSFUL to 0
>   Tidy Success/Failure checks
>   Change PCIBIOS_SUCCESSFUL to 0

Some patches have identical subject lines including the subsystem
prefix, which you should avoid. Try to also fix the git request-pull
output to not drop that prefix here so the list makes more sense.

        Arnd
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 09/35] nvme-pci: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 09/35] nvme-pci: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-13 16:42   ` Rajashekar, Revanth
  2020-07-13 18:24     ` Saheed Bolarinwa
  0 siblings, 1 reply; 72+ messages in thread
From: Rajashekar, Revanth @ 2020-07-13 16:42 UTC (permalink / raw)
  To: Saheed O. Bolarinwa, helgaas, Keith Busch, Jens Axboe,
	Christoph Hellwig, Sagi Grimberg
  Cc: linux-pci, linux-kernel, linux-nvme, linux-kernel-mentees

Hi,

On 7/13/2020 6:22 AM, Saheed O. Bolarinwa wrote:
> In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
> Their scope should be limited within arch/x86.
>
> Change all PCIBIOS_SUCCESSFUL to 0
>
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
> ---
>  drivers/nvme/host/pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index b1d18f0633c7..d426efb53f44 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -1185,7 +1185,7 @@ static void nvme_warn_reset(struct nvme_dev *dev, u32 csts)
>  
>  	result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS,
>  				      &pci_status);
> -	if (result == PCIBIOS_SUCCESSFUL)
> +	if (result == 0)
How about simplifying the check to if (!result)?
>  		dev_warn(dev->ctrl.device,
>  			 "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n",
>  			 csts, pci_status);
Thanks!
Revanth
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: " Saheed O. Bolarinwa
@ 2020-07-13 17:16   ` Larry Finger
  2020-07-13 19:13     ` Saheed Bolarinwa
  0 siblings, 1 reply; 72+ messages in thread
From: Larry Finger @ 2020-07-13 17:16 UTC (permalink / raw)
  To: Saheed O. Bolarinwa, helgaas, Michael Buesch
  Cc: linux-pci, linux-wireless, linux-kernel, linux-kernel-mentees

On 7/13/20 7:22 AM, Saheed O. Bolarinwa wrote:
> In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
> Their scope should be limited within arch/x86.
> 
> Change all PCIBIOS_SUCCESSFUL to 0
> 
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>

Could you please tell me what difference this makes? It looks like source churn 
rather than a substantive change. The symbol is defined in pci.h and is used in 
many architures. Certainly, PCIBIOS_SUCCESSFUL indicates success even more 
clearly than 0 does.

Why is your name inside quotes in your s-o-b?

Larry
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 09/35] nvme-pci: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 16:42   ` Rajashekar, Revanth
@ 2020-07-13 18:24     ` Saheed Bolarinwa
  0 siblings, 0 replies; 72+ messages in thread
From: Saheed Bolarinwa @ 2020-07-13 18:24 UTC (permalink / raw)
  To: Rajashekar, Revanth, helgaas, Keith Busch, Jens Axboe,
	Christoph Hellwig, Sagi Grimberg
  Cc: linux-pci, linux-kernel, linux-nvme, linux-kernel-mentees


On 7/13/20 6:42 PM, Rajashekar, Revanth wrote:
> Hi,
>
> On 7/13/2020 6:22 AM, Saheed O. Bolarinwa wrote:
>> In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
>> Their scope should be limited within arch/x86.
>>
>> Change all PCIBIOS_SUCCESSFUL to 0
>>
>> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
>> ---
>>   drivers/nvme/host/pci.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
>> index b1d18f0633c7..d426efb53f44 100644
>> --- a/drivers/nvme/host/pci.c
>> +++ b/drivers/nvme/host/pci.c
>> @@ -1185,7 +1185,7 @@ static void nvme_warn_reset(struct nvme_dev *dev, u32 csts)
>>   
>>   	result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS,
>>   				      &pci_status);
>> -	if (result == PCIBIOS_SUCCESSFUL)
>> +	if (result == 0)
> How about simplifying the check to if (!result)?

Thank you for the review.  I did in PATCH 10/35. I will merge both.

I wanted to separate the goal from the fix but I see it's confusing.

- Saheed

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 19:13     ` Saheed Bolarinwa
@ 2020-07-13 18:29       ` Arnd Bergmann
  2020-07-13 18:35       ` Larry Finger
  1 sibling, 0 replies; 72+ messages in thread
From: Arnd Bergmann @ 2020-07-13 18:29 UTC (permalink / raw)
  To: Saheed Bolarinwa
  Cc: linux-pci, linux-wireless, linux-kernel, Bjorn Helgaas,
	Michael Buesch, linux-kernel-mentees, Larry Finger

On Mon, Jul 13, 2020 at 8:13 PM Saheed Bolarinwa
<refactormyself@gmail.com> wrote:
> On 7/13/20 7:16 PM, Larry Finger wrote:
>
> > Why is your name inside quotes in your s-o-b?
> >
> To keep me company before I get to know my way within the kernel.
>
> I saw people with >2 names do it, so I did! Please let me know if it is odd.

It's required for a proper email header if you have a dor (.) in your cleartext
name, but it is not required in a Signed-off-by tag, though a number of people
still do it out of habit. I'm sure it's fine either way.

     Arnd
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 19:13     ` Saheed Bolarinwa
  2020-07-13 18:29       ` Arnd Bergmann
@ 2020-07-13 18:35       ` Larry Finger
  1 sibling, 0 replies; 72+ messages in thread
From: Larry Finger @ 2020-07-13 18:35 UTC (permalink / raw)
  To: Saheed Bolarinwa, helgaas, Michael Buesch
  Cc: linux-pci, linux-wireless, linux-kernel, linux-kernel-mentees

On 7/13/20 2:13 PM, Saheed Bolarinwa wrote:
> Hello Larry,
> 
> On 7/13/20 7:16 PM, Larry Finger wrote:
>> On 7/13/20 7:22 AM, Saheed O. Bolarinwa wrote:
>>> In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
>>> Their scope should be limited within arch/x86.
>>>
>>> Change all PCIBIOS_SUCCESSFUL to 0
>>>
>>> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
>>
>> Could you please tell me what difference this makes? It looks like source 
>> churn rather than a substantive change. The symbol is defined in pci.h and is 
>> used in many architures. Certainly, PCIBIOS_SUCCESSFUL indicates success even 
>> more clearly than 0 does.
>>
> It is a trivial first step towards a probably significant task. I explained in 
> the Cover Letter, I can see it didn't get through but I Cc linux-wireless 
> (properly this time). Probably, too many addresses.
> 
> I have resent it. It is here 
> https://lore.kernel.org/linux-wireless/20200713185559.31967-1-refactormyself@gmail.com/T/#u 
> 
> 
>> Why is your name inside quotes in your s-o-b?
>>
> To keep me company before I get to know my way within the kernel.
> 
> I saw people with >2 names do it, so I did! Please let me know if it is odd.
> 

Thank you for the explanations. The cover letter did help.

For both SSB and BMCA changes,

Acked-by: Larry Finger <Larry.Finger@lwfinger.net>

Larry

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 17:16   ` Larry Finger
@ 2020-07-13 19:13     ` Saheed Bolarinwa
  2020-07-13 18:29       ` Arnd Bergmann
  2020-07-13 18:35       ` Larry Finger
  0 siblings, 2 replies; 72+ messages in thread
From: Saheed Bolarinwa @ 2020-07-13 19:13 UTC (permalink / raw)
  To: Larry Finger, helgaas, Michael Buesch
  Cc: linux-pci, linux-wireless, linux-kernel, linux-kernel-mentees

Hello Larry,

On 7/13/20 7:16 PM, Larry Finger wrote:
> On 7/13/20 7:22 AM, Saheed O. Bolarinwa wrote:
>> In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
>> Their scope should be limited within arch/x86.
>>
>> Change all PCIBIOS_SUCCESSFUL to 0
>>
>> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
>
> Could you please tell me what difference this makes? It looks like 
> source churn rather than a substantive change. The symbol is defined 
> in pci.h and is used in many architures. Certainly, PCIBIOS_SUCCESSFUL 
> indicates success even more clearly than 0 does.
>
It is a trivial first step towards a probably significant task. I 
explained in the Cover Letter, I can see it didn't get through but I Cc 
linux-wireless (properly this time). Probably, too many addresses.

I have resent it. It is here 
https://lore.kernel.org/linux-wireless/20200713185559.31967-1-refactormyself@gmail.com/T/#u

> Why is your name inside quotes in your s-o-b?
>
To keep me company before I get to know my way within the kernel.

I saw people with >2 names do it, so I did! Please let me know if it is odd.

Thank you.

- Saheed

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
                   ` (35 preceding siblings ...)
  2020-07-13 15:08 ` [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Arnd Bergmann
@ 2020-07-13 22:01 ` Bjorn Helgaas
  36 siblings, 0 replies; 72+ messages in thread
From: Bjorn Helgaas @ 2020-07-13 22:01 UTC (permalink / raw)
  To: Saheed O. Bolarinwa
  Cc: Rich Felker, Martin K. Petersen, linux-sh, linux-pci, linux-nvme,
	Yicong Yang, Keith Busch, Realtek linux nic maintainers,
	Paul Mackerras, linux-i2c, bcm-kernel-feedback-list, sparclinux,
	rfi, Toan Le, Greg Ungerer, Marek Vasut, Rob Herring,
	Stefano Stabellini, Sagi Grimberg, Yoshinori Sato, linux-scsi,
	Michael Ellerman, linux-atm-general, Russell King, Ley Foon Tan,
	Christoph Hellwig, Geert Uytterhoeven, Rafał Miłecki,
	Chas Williams, Benjamin Herrenschmidt, xen-devel, Matt Turner,
	linux-mips, linux-kernel-mentees, Kevin Hilman, Guenter Roeck,
	linux-hwmon, Jean Delvare, Andrew Donnellan, Arnd Bergmann,
	Ray Jui, James E.J. Bottomley, Yue Wang, Jens Axboe,
	Jakub Kicinski, linux-m68k, Lorenzo Pieralisi, Ivan Kokshaysky,
	Michael Buesch, linux-amlogic, Boris Ostrovsky, Guan Xuetao,
	linux-arm-kernel, Richard Henderson, Juergen Gross, Michal Simek,
	Thomas Bogendoerfer, Scott Branden, Bjorn Helgaas, Jingoo Han,
	netdev, Yoshihiro Shimoda, linux-wireless, linux-kernel,
	linux-renesas-soc, Brian King, Philipp Zabel, linux-alpha,
	Frederic Barrat, Gustavo Pimentel, linuxppc-dev, David S. Miller,
	Heiner Kallweit

On Mon, Jul 13, 2020 at 02:22:12PM +0200, Saheed O. Bolarinwa wrote:
> This goal of these series is to move the definition of *all* PCIBIOS* from
> include/linux/pci.h to arch/x86 and limit their use within there.
> All other tree specific definition will be left for intact. Maybe they can
> be renamed.

More comments later, but a few trivial whitespace issues you can clean
up in the meantime.  Don't repost for at least a few days to avoid
spamming everybody.  I found these with:

  $ b4 am -om/ 20200713122247.10985-1-refactormyself@gmail.com
  $ git am m/20200713_refactormyself_move_all_pcibios_definitions_into_arch_x86.mbx

  Applying: atm: Change PCIBIOS_SUCCESSFUL to 0
  .git/rebase-apply/patch:11: trailing whitespace.
	  iadev = INPH_IA_DEV(dev);
  .git/rebase-apply/patch:12: trailing whitespace.
	  for(i=0; i<64; i++)
  .git/rebase-apply/patch:13: trailing whitespace.
	    if ((error = pci_read_config_dword(iadev->pci,
  .git/rebase-apply/patch:16: trailing whitespace, space before tab in indent.
		return error;
  .git/rebase-apply/patch:17: trailing whitespace.
	  writel(0, iadev->reg+IPHASE5575_EXT_RESET);
  warning: squelched 5 whitespace errors
  warning: 10 lines add whitespace errors.
  Applying: atm: Tidy Success/Failure checks
  .git/rebase-apply/patch:13: trailing whitespace.

  .git/rebase-apply/patch:14: trailing whitespace.
	  iadev = INPH_IA_DEV(dev);
  .git/rebase-apply/patch:15: trailing whitespace.
	  for(i=0; i<64; i++)
  .git/rebase-apply/patch:21: trailing whitespace.
	  writel(0, iadev->reg+IPHASE5575_EXT_RESET);
  .git/rebase-apply/patch:22: trailing whitespace.
	  for(i=0; i<64; i++)
  warning: squelched 3 whitespace errors
  warning: 8 lines add whitespace errors.
  Applying: atm: Fix Style ERROR- assignment in if condition
  .git/rebase-apply/patch:12: trailing whitespace.
	  unsigned int pci[64];
  .git/rebase-apply/patch:13: trailing whitespace.

  .git/rebase-apply/patch:14: trailing whitespace.
	  iadev = INPH_IA_DEV(dev);
  .git/rebase-apply/patch:23: trailing whitespace.
	  writel(0, iadev->reg+IPHASE5575_EXT_RESET);
  .git/rebase-apply/patch:32: trailing whitespace.
	  udelay(5);
  warning: squelched 2 whitespace errors
  warning: 7 lines add whitespace errors.
  Applying: PCI: Change PCIBIOS_SUCCESSFUL to 0
  .git/rebase-apply/patch:37: trailing whitespace.
  struct pci_ops apecs_pci_ops =
  .git/rebase-apply/patch:50: trailing whitespace.
  static int
  .git/rebase-apply/patch:59: trailing whitespace.
  struct pci_ops cia_pci_ops =
  .git/rebase-apply/patch:94: trailing whitespace.
  static int
  .git/rebase-apply/patch:103: trailing whitespace.
  struct pci_ops lca_pci_ops =
  warning: squelched 10 whitespace errors
  warning: 15 lines add whitespace errors.
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 16/35] hwmon: (sis5595) Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 16/35] hwmon: (sis5595) Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
@ 2020-07-14  5:02   ` Guenter Roeck
  0 siblings, 0 replies; 72+ messages in thread
From: Guenter Roeck @ 2020-07-14  5:02 UTC (permalink / raw)
  To: Saheed O. Bolarinwa, helgaas, Jean Delvare
  Cc: linux-hwmon, linux-pci, linux-kernel, linux-kernel-mentees

On 7/13/20 5:22 AM, Saheed O. Bolarinwa wrote:
> In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
> Their scope should be limited within arch/x86.
> 
> Change all PCIBIOS_SUCCESSFUL to 0
> 
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
> ---
>  drivers/hwmon/sis5595.c | 8 ++++----
>  drivers/hwmon/via686a.c | 8 ++++----
>  drivers/hwmon/vt8231.c  | 8 ++++----
>  3 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
> index 0c6741f949f5..0ea174fb3048 100644
> --- a/drivers/hwmon/sis5595.c
> +++ b/drivers/hwmon/sis5595.c
> @@ -825,7 +825,7 @@ static int sis5595_pci_probe(struct pci_dev *dev,
>  		pci_write_config_word(dev, SIS5595_BASE_REG, force_addr);
>  	}
>  
> -	if (PCIBIOS_SUCCESSFUL !=
> +	if (0 !=
>  	    pci_read_config_word(dev, SIS5595_BASE_REG, &address)) {

Yoda programming already terrible is, but "0 !=" is even worse than that
(and completely unnecessary). If you want to clean this up, do it right
and drop those unnecessary comparisons.

Guenter
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 17/35] hwmon: (sis5595) Tidy Success/Failure checks
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 17/35] hwmon: (sis5595) Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-14  5:04   ` Guenter Roeck
  0 siblings, 0 replies; 72+ messages in thread
From: Guenter Roeck @ 2020-07-14  5:04 UTC (permalink / raw)
  To: Saheed O. Bolarinwa, helgaas, Jean Delvare
  Cc: linux-hwmon, linux-pci, linux-kernel, linux-kernel-mentees

On 7/13/20 5:22 AM, Saheed O. Bolarinwa wrote:
> Remove unnecessary check for 0.
> 
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
> ---
> This patch depends on PATCH 16/35
> 
>  drivers/hwmon/sis5595.c | 13 ++++---------
>  drivers/hwmon/via686a.c | 13 ++++---------
>  drivers/hwmon/vt8231.c  | 13 ++++---------
>  3 files changed, 12 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
> index 0ea174fb3048..91fdddaa4136 100644
> --- a/drivers/hwmon/sis5595.c
> +++ b/drivers/hwmon/sis5595.c
> @@ -825,8 +825,7 @@ static int sis5595_pci_probe(struct pci_dev *dev,
>  		pci_write_config_word(dev, SIS5595_BASE_REG, force_addr);
>  	}
>  
> -	if (0 !=
> -	    pci_read_config_word(dev, SIS5595_BASE_REG, &address)) {
> +	if (pci_read_config_word(dev, SIS5595_BASE_REG, &address)) {

Ah, there is is, and I see that others commented on it.
Single patch, please.

Guenter
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-13 15:08 ` [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Arnd Bergmann
@ 2020-07-14 18:45   ` Bjorn Helgaas
  2020-07-14 21:02     ` Kjetil Oftedal
                       ` (3 more replies)
  0 siblings, 4 replies; 72+ messages in thread
From: Bjorn Helgaas @ 2020-07-14 18:45 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, linux-pci, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Ray Jui, Jens Axboe,
	Ivan Kokshaysky, Boris Ostrovsky, Richard Henderson,
	Juergen Gross, Bjorn Helgaas, Thomas Bogendoerfer, Scott Branden,
	Jingoo Han, Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

[trimmed the cc list; it's still too large but maybe arch folks care]

On Mon, Jul 13, 2020 at 05:08:10PM +0200, Arnd Bergmann wrote:
> On Mon, Jul 13, 2020 at 3:22 PM Saheed O. Bolarinwa
> <refactormyself@gmail.com> wrote:
> > This goal of these series is to move the definition of *all*
> > PCIBIOS* from include/linux/pci.h to arch/x86 and limit their use
> > within there.  All other tree specific definition will be left for
> > intact. Maybe they can be renamed.
> >
> > PCIBIOS* is an x86 concept as defined by the PCI spec. The
> > returned error codes of PCIBIOS* are positive values and this
> > introduces some complexities which other archs need not incur.
> 
> I think the intention is good, but I find the series in its current
> form very hard to review, in particular the way you touch some
> functions three times with trivial changes. Instead of
> 
> 1) replace PCIBIOS_SUCCESSFUL with 0
> 2) drop pointless 0-comparison
> 3) reformat whitespace
> 
> I would suggest to combine the first two steps into one patch per
> subsystem and drop the third step.

I agree.  BUT please don't just run out and post new patches to do
this.  Let's talk about Arnd's further ideas below first.

> ...
> Maybe the work can be split up differently, with a similar end
> result but fewer and easier reviewed patches. The way I'd look at
> the problem, there are three main areas that can be dealt with one
> at a time:
> 
> a) callers of the high-level config space accessors
>    pci_{write,read}_config_{byte,word,dword}, mostly in device
>    drivers.
> b) low-level implementation of the config space accessors
>     through struct pci_ops
> c) all other occurrences of these constants
> 
> Starting with a), my first question is whether any high-level
> drivers even need to care about errors from these functions. I see
> 4913 callers that ignore the return code, and 576 that actually
> check it, and almost none care about the specific error (as you
> found as well). Unless we conclude that most PCI drivers are wrong,
> could we just change the return type to 'void' and assume they never
> fail for valid arguments on a valid pci_device* ?

I really like this idea.

pci_write_config_*() has one return value, and only 100ish of 2500
callers check for errors.  It's sometimes possible for config
accessors to detect PCI errors and return failure, e.g., device was
removed or didn't respond, but most of them don't, and detecting these
errors is not really that valuable.

pci_read_config_*() is much more interesting because it returns two
things, the function return value and the value read from the PCI
device, and it's complicated to check both. 

Again it's sometimes possible for config read accessors to detect PCI
errors, but in most cases a PCI error means the accessor returns
success and the value from PCI is ~0.

Checking the function return value catches programming errors (bad
alignment, etc) but misses most of the interesting errors (device was
unplugged or reported a PCI error).

Checking the value returned from PCI is tricky because ~0 is a valid
value for some config registers, and only the driver knows for sure.
If the driver knows that ~0 is a possible value, it would have to do
something else, e.g., another config read of a register that *cannot*
be ~0, to see whether it's really an error.

I suspect that if we had a single value to look at it would be easier
to get right.  Error checking with current interface would look like
this:

  err = pci_read_config_word(dev, addr, &val);
  if (err)
    return -EINVAL;

  if (PCI_POSSIBLE_ERROR(val)) {
    /* if driver knows ~0 is invalid */
    return -EINVAL;

    /* if ~0 is potentially a valid value */
    err = pci_read_config_word(dev, PCI_VENDOR_ID, &val2);
    if (err)
      return -EINVAL;

    if (PCI_POSSIBLE_ERROR(val2))
      return -EINVAL;
  }

Error checking with a possible interface that returned only a single
value could look like this:

  val = pci_config_read_word(dev, addr);
  if (PCI_POSSIBLE_ERROR(val)) {
    /* if driver knows ~0 is invalid */
    return -EINVAL;

    /* if ~0 is potentially a valid value */
    val2 = pci_config_read_word(dev, PCI_VENDOR_ID);
    if (PCI_POSSIBLE_ERROR(val2))
      return -EINVAL;
  }

Am I understanding you correctly?

> For b), it might be nice to also change other aspects of the
> interface, e.g. passing a pci_host_bridge pointer plus bus number
> instead of a pci_bus pointer, or having the callback in the
> pci_host_bridge structure.

I like this idea a lot, too.  I think the fact that
pci_bus_read_config_word() requires a pci_bus * complicates things in
a few places.

I think it's completely separate, as you say, and we should defer it
for now because even part a) is a lot of work.  I added it to my list
of possible future projects.

Bjorn
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 18:45   ` Bjorn Helgaas
@ 2020-07-14 21:02     ` Kjetil Oftedal
  2020-07-15  2:14       ` Benjamin Herrenschmidt
  2020-07-14 22:01     ` Arnd Bergmann
                       ` (2 subsequent siblings)
  3 siblings, 1 reply; 72+ messages in thread
From: Kjetil Oftedal @ 2020-07-14 21:02 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, linux-pci, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Arnd Bergmann, Ray Jui,
	Jens Axboe, Ivan Kokshaysky, Boris Ostrovsky, Richard Henderson,
	Juergen Gross, Bjorn Helgaas, Thomas Bogendoerfer, Scott Branden,
	Jingoo Han, Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On 14/07/2020, Bjorn Helgaas <helgaas@kernel.org> wrote:

>>
>> a) callers of the high-level config space accessors
>>    pci_{write,read}_config_{byte,word,dword}, mostly in device
>>    drivers.
>> b) low-level implementation of the config space accessors
>>     through struct pci_ops
>> c) all other occurrences of these constants
>>
>> Starting with a), my first question is whether any high-level
>> drivers even need to care about errors from these functions. I see
>> 4913 callers that ignore the return code, and 576 that actually
>> check it, and almost none care about the specific error (as you
>> found as well). Unless we conclude that most PCI drivers are wrong,
>> could we just change the return type to 'void' and assume they never
>> fail for valid arguments on a valid pci_device* ?
>
> I really like this idea.
>
> pci_write_config_*() has one return value, and only 100ish of 2500
> callers check for errors.  It's sometimes possible for config
> accessors to detect PCI errors and return failure, e.g., device was
> removed or didn't respond, but most of them don't, and detecting these
> errors is not really that valuable.
>
> pci_read_config_*() is much more interesting because it returns two
> things, the function return value and the value read from the PCI
> device, and it's complicated to check both.
>
> Again it's sometimes possible for config read accessors to detect PCI
> errors, but in most cases a PCI error means the accessor returns
> success and the value from PCI is ~0.
>
> Checking the function return value catches programming errors (bad
> alignment, etc) but misses most of the interesting errors (device was
> unplugged or reported a PCI error).
>
> Checking the value returned from PCI is tricky because ~0 is a valid
> value for some config registers, and only the driver knows for sure.
> If the driver knows that ~0 is a possible value, it would have to do
> something else, e.g., another config read of a register that *cannot*
> be ~0, to see whether it's really an error.
>
> I suspect that if we had a single value to look at it would be easier
> to get right.  Error checking with current interface would look like
> this:
>
>   err = pci_read_config_word(dev, addr, &val);
>   if (err)
>     return -EINVAL;
>
>   if (PCI_POSSIBLE_ERROR(val)) {
>     /* if driver knows ~0 is invalid */
>     return -EINVAL;
>
>     /* if ~0 is potentially a valid value */
>     err = pci_read_config_word(dev, PCI_VENDOR_ID, &val2);
>     if (err)
>       return -EINVAL;
>
>     if (PCI_POSSIBLE_ERROR(val2))
>       return -EINVAL;
>   }
>
> Error checking with a possible interface that returned only a single
> value could look like this:
>
>   val = pci_config_read_word(dev, addr);
>   if (PCI_POSSIBLE_ERROR(val)) {
>     /* if driver knows ~0 is invalid */
>     return -EINVAL;
>
>     /* if ~0 is potentially a valid value */
>     val2 = pci_config_read_word(dev, PCI_VENDOR_ID);
>     if (PCI_POSSIBLE_ERROR(val2))
>       return -EINVAL;
>   }
>
> Am I understanding you correctly?

Let us not do this. Reading config space is really expensive on some
architectures. Requiring a driver to do it twice on some values does not
improve upon that situation. And is quite redundant if the Root Complex
driver already knows that the first access has failed.

Additionally since multiple config accesses to the same devices is not
allowed in the spec, the hardware must block and wait for a timeout if
a config access does not get a response.
(Can happen if a intermediate link between the RC and endpoint has to retrain)
Having to block twice is very much not ideal. And in the case with
retraining the secondary access might even succeed. As the link might
recover between reading the first config word and reading PCI_VENDOR_ID.
Thus allowing the driver to accept invalid data from the device.

>
>> For b), it might be nice to also change other aspects of the
>> interface, e.g. passing a pci_host_bridge pointer plus bus number
>> instead of a pci_bus pointer, or having the callback in the
>> pci_host_bridge structure.
>
> I like this idea a lot, too.  I think the fact that
> pci_bus_read_config_word() requires a pci_bus * complicates things in
> a few places.
>
> I think it's completely separate, as you say, and we should defer it
> for now because even part a) is a lot of work.  I added it to my list
> of possible future projects.
>

What about strange PCI devices such as Non-Transparent bridges?
They will require their own PCI Config space accessors that is not
connected to a host bridge if one wants to do some sort of
punch-through enumeration.
I guess the kernel doesn't care much about them?

Best regards,
Kjetil Oftedal
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 18:45   ` Bjorn Helgaas
  2020-07-14 21:02     ` Kjetil Oftedal
@ 2020-07-14 22:01     ` Arnd Bergmann
  2020-07-14 23:46       ` Bjorn Helgaas
  2020-07-15  4:18       ` Oliver O'Halloran
  2020-07-14 23:14     ` Rob Herring
  2020-07-15  2:12     ` Benjamin Herrenschmidt
  3 siblings, 2 replies; 72+ messages in thread
From: Arnd Bergmann @ 2020-07-14 22:01 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, linux-pci, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Ray Jui, Jens Axboe,
	Ivan Kokshaysky, Boris Ostrovsky, Richard Henderson,
	Juergen Gross, Bjorn Helgaas, Thomas Bogendoerfer, Scott Branden,
	Jingoo Han, Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On Tue, Jul 14, 2020 at 8:45 PM Bjorn Helgaas <helgaas@kernel.org> wrote:
> On Mon, Jul 13, 2020 at 05:08:10PM +0200, Arnd Bergmann wrote:
> > On Mon, Jul 13, 2020 at 3:22 PM Saheed O. Bolarinwa
> > Starting with a), my first question is whether any high-level
> > drivers even need to care about errors from these functions. I see
> > 4913 callers that ignore the return code, and 576 that actually
> > check it, and almost none care about the specific error (as you
> > found as well). Unless we conclude that most PCI drivers are wrong,
> > could we just change the return type to 'void' and assume they never
> > fail for valid arguments on a valid pci_device* ?
>
> I really like this idea.
>
> pci_write_config_*() has one return value, and only 100ish of 2500
> callers check for errors.  It's sometimes possible for config
> accessors to detect PCI errors and return failure, e.g., device was
> removed or didn't respond, but most of them don't, and detecting these
> errors is not really that valuable.
>
> pci_read_config_*() is much more interesting because it returns two
> things, the function return value and the value read from the PCI
> device, and it's complicated to check both.
>
> Again it's sometimes possible for config read accessors to detect PCI
> errors, but in most cases a PCI error means the accessor returns
> success and the value from PCI is ~0.
>
> Checking the function return value catches programming errors (bad
> alignment, etc) but misses most of the interesting errors (device was
> unplugged or reported a PCI error).

My thinking was more that most of the time the error checking may
be completely bogus to start with, and I would just not check for
errors at all.

> Checking the value returned from PCI is tricky because ~0 is a valid
> value for some config registers, and only the driver knows for sure.
> If the driver knows that ~0 is a possible value, it would have to do
> something else, e.g., another config read of a register that *cannot*
> be ~0, to see whether it's really an error.
>
> I suspect that if we had a single value to look at it would be easier
> to get right.  Error checking with current interface would look like
> this:
>
>   err = pci_read_config_word(dev, addr, &val);
>   if (err)
>     return -EINVAL;
>
>   if (PCI_POSSIBLE_ERROR(val)) {
>     /* if driver knows ~0 is invalid */
>     return -EINVAL;
>
>     /* if ~0 is potentially a valid value */
>     err = pci_read_config_word(dev, PCI_VENDOR_ID, &val2);
>     if (err)
>       return -EINVAL;
>
>     if (PCI_POSSIBLE_ERROR(val2))
>       return -EINVAL;
>   }
>
> Error checking with a possible interface that returned only a single
> value could look like this:
>
>   val = pci_config_read_word(dev, addr);
>   if (PCI_POSSIBLE_ERROR(val)) {
>     /* if driver knows ~0 is invalid */
>     return -EINVAL;
>
>     /* if ~0 is potentially a valid value */
>     val2 = pci_config_read_word(dev, PCI_VENDOR_ID);
>     if (PCI_POSSIBLE_ERROR(val2))
>       return -EINVAL;
>   }
>
> Am I understanding you correctly?

That would require changing all callers of the function, which
I think would involve changing some 700 files. What I was
suggesting was to only change the return type to void and
categorize all drivers that today check it as either

a) checking the return code is not helpful, or possibly even
    wrong, so we just stop doing it. I expect those to be the
    vast majority of callers, but that could be wrong.

b) Code that legitimately check the error code and need to
   take an appropriate action. These could be changed to
   calling a different interface such as 'pci_bus_read_config_word'
   or a new 'pci_device_last_error()' function.

The reasons I suspect that most callers don't actually need
to check for errors are:

- Most error checking is static: PCIBIOS_BAD_REGISTER_NUMBER
  only happens if you pass an invalid register number, but most
  callers pass a compile-time constant register number that is
  known to be correct, or the driver would never work. Similarly,
  PCIBIOS_DEVICE_NOT_FOUND wouldn't normally happen
  since you pass a valid pci_device pointer that was already
  probed.

- config space accesses are very rare compared to memory
  space access and on the hardware side the error handling
  would be similar, but readl/writel don't return errors, they just
  access wrong registers or return 0xffffffff.
  arch/powerpc/kernel/eeh.c has a ton extra code written to
  deal with it, but no other architectures do.

- If we add code to detect errors in pci_read_config_*
  and do some of the stuff from powerpc's
  eeh_dev_check_failure(), we are more likely to catch
  intermittent failures when drivers don't check, or bugs
  with invalid arguments in device drivers than relying on
  drivers to get their error handling right when those code
  paths don't ever get covered in normal testing.

Looking at a couple of random drivers that do check the
return codes, I find:

drivers/edac/amd8131_edac.c: prints the register number,
then keeps going. This is not useful

drivers/net/ethernet/mellanox/mlx4/reset.c: error handling
in mlx4_reset() seems reasonable, but it gets called
from mlx4_pci_resume(), which has a 'void' return code and
cannot propagate the error further. My guess is that it
would try to keep going after a failed resume and run into
random other problems then.

drivers/ata/pata_cs5536.c: error code gets passed to
caller and then always ignored. Can clearly be changed

drivers/net/wireless/intersil/prism54/islpci_hotplug.c:
Out of two calls, only one is checked, which seems bogus

drivers/usb/host/pci-quirks.c: only one of many instances
has a check, again this seems bogus.

drivers/leds/leds-ss4200.c: called from probe(), which
seems to correctly deal with errors by failing the probe.
Not sure this can ever fail though, since the driver only does
it after pci_enable_device() succeeds first. Note that
pci_enable_device() ignores pci_read_config_byte()
errors but sanity-checks the register contents/

        Arnd
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 18:45   ` Bjorn Helgaas
  2020-07-14 21:02     ` Kjetil Oftedal
  2020-07-14 22:01     ` Arnd Bergmann
@ 2020-07-14 23:14     ` Rob Herring
  2020-07-15  2:12     ` Benjamin Herrenschmidt
  3 siblings, 0 replies; 72+ messages in thread
From: Rob Herring @ 2020-07-14 23:14 UTC (permalink / raw)
  To: Bjorn Helgaas, Arnd Bergmann
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Greg Ungerer, Marek Vasut, Lorenzo Pieralisi,
	Sagi Grimberg, Michael Ellerman, Russell King, Ley Foon Tan,
	Christoph Hellwig, Geert Uytterhoeven, Kevin Hilman, linux-pci,
	Jakub Kicinski, Matt Turner, linux-kernel-mentees, Guenter Roeck,
	Ray Jui, Jens Axboe, Ivan Kokshaysky, Boris Ostrovsky,
	Richard Henderson, Juergen Gross, Bjorn Helgaas,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han,
	Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On Tue, Jul 14, 2020 at 12:45 PM Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> [trimmed the cc list; it's still too large but maybe arch folks care]
>
> On Mon, Jul 13, 2020 at 05:08:10PM +0200, Arnd Bergmann wrote:
> > On Mon, Jul 13, 2020 at 3:22 PM Saheed O. Bolarinwa
> > <refactormyself@gmail.com> wrote:
> > > This goal of these series is to move the definition of *all*
> > > PCIBIOS* from include/linux/pci.h to arch/x86 and limit their use
> > > within there.  All other tree specific definition will be left for
> > > intact. Maybe they can be renamed.
> > >
> > > PCIBIOS* is an x86 concept as defined by the PCI spec. The
> > > returned error codes of PCIBIOS* are positive values and this
> > > introduces some complexities which other archs need not incur.
> >
> > I think the intention is good, but I find the series in its current
> > form very hard to review, in particular the way you touch some
> > functions three times with trivial changes. Instead of
> >
> > 1) replace PCIBIOS_SUCCESSFUL with 0
> > 2) drop pointless 0-comparison
> > 3) reformat whitespace
> >
> > I would suggest to combine the first two steps into one patch per
> > subsystem and drop the third step.
>
> I agree.  BUT please don't just run out and post new patches to do
> this.  Let's talk about Arnd's further ideas below first.
>
> > ...
> > Maybe the work can be split up differently, with a similar end
> > result but fewer and easier reviewed patches. The way I'd look at
> > the problem, there are three main areas that can be dealt with one
> > at a time:
> >
> > a) callers of the high-level config space accessors
> >    pci_{write,read}_config_{byte,word,dword}, mostly in device
> >    drivers.
> > b) low-level implementation of the config space accessors
> >     through struct pci_ops
> > c) all other occurrences of these constants
> >
> > Starting with a), my first question is whether any high-level
> > drivers even need to care about errors from these functions. I see
> > 4913 callers that ignore the return code, and 576 that actually
> > check it, and almost none care about the specific error (as you
> > found as well). Unless we conclude that most PCI drivers are wrong,
> > could we just change the return type to 'void' and assume they never
> > fail for valid arguments on a valid pci_device* ?
>
> I really like this idea.
>
> pci_write_config_*() has one return value, and only 100ish of 2500
> callers check for errors.  It's sometimes possible for config
> accessors to detect PCI errors and return failure, e.g., device was
> removed or didn't respond, but most of them don't, and detecting these
> errors is not really that valuable.
>
> pci_read_config_*() is much more interesting because it returns two
> things, the function return value and the value read from the PCI
> device, and it's complicated to check both.
>
> Again it's sometimes possible for config read accessors to detect PCI
> errors, but in most cases a PCI error means the accessor returns
> success and the value from PCI is ~0.
>
> Checking the function return value catches programming errors (bad
> alignment, etc) but misses most of the interesting errors (device was
> unplugged or reported a PCI error).
>
> Checking the value returned from PCI is tricky because ~0 is a valid
> value for some config registers, and only the driver knows for sure.
> If the driver knows that ~0 is a possible value, it would have to do
> something else, e.g., another config read of a register that *cannot*
> be ~0, to see whether it's really an error.
>
> I suspect that if we had a single value to look at it would be easier
> to get right.  Error checking with current interface would look like
> this:
>
>   err = pci_read_config_word(dev, addr, &val);
>   if (err)
>     return -EINVAL;
>
>   if (PCI_POSSIBLE_ERROR(val)) {
>     /* if driver knows ~0 is invalid */
>     return -EINVAL;
>
>     /* if ~0 is potentially a valid value */
>     err = pci_read_config_word(dev, PCI_VENDOR_ID, &val2);
>     if (err)
>       return -EINVAL;
>
>     if (PCI_POSSIBLE_ERROR(val2))
>       return -EINVAL;
>   }
>
> Error checking with a possible interface that returned only a single
> value could look like this:
>
>   val = pci_config_read_word(dev, addr);
>   if (PCI_POSSIBLE_ERROR(val)) {
>     /* if driver knows ~0 is invalid */
>     return -EINVAL;
>
>     /* if ~0 is potentially a valid value */
>     val2 = pci_config_read_word(dev, PCI_VENDOR_ID);
>     if (PCI_POSSIBLE_ERROR(val2))
>       return -EINVAL;
>   }
>
> Am I understanding you correctly?
>
> > For b), it might be nice to also change other aspects of the
> > interface, e.g. passing a pci_host_bridge pointer plus bus number
> > instead of a pci_bus pointer, or having the callback in the
> > pci_host_bridge structure.
>
> I like this idea a lot, too.  I think the fact that
> pci_bus_read_config_word() requires a pci_bus * complicates things in
> a few places.

I've been looking at the various host implementations of config
accessors as well as probe functions. Needing the pci_bus pointer is a
big reason why host drivers will have 2 sets of config accessors or
don't use the generic ones. Often that's just for the root bus config
space init before pci_host_probe() is called. Perhaps that's better
addressed with a fixup hook for the host bridge? ftpci100i is a good
example of this.

The root bus accesses are often different from the rest of config
space. Determining if an access is for the root bus or not is all over
the map, but often involves a private bus number variable. I have a
series to use pci_is_root_bus() instead and eliminate a bunch of bus
number handling in the host drivers (I'm sure there's a bunch of hosts
that would be broken if the root bus is not 0). The majority of hosts
don't really need to know anything about the bus number. The more I've
thought about it, it would be better if the PCI core handled this and
picked the right ops to call. We already have several cases of host
drivers with their own ops for this and we could eliminate several
layers of indirection (looking at you, DWC). Any thoughts on direction
here would be helpful.

> I think it's completely separate, as you say, and we should defer it
> for now because even part a) is a lot of work.  I added it to my list
> of possible future projects.

Got that published somewhere? :)

Rob
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 22:01     ` Arnd Bergmann
@ 2020-07-14 23:46       ` Bjorn Helgaas
  2020-07-15  2:19         ` Benjamin Herrenschmidt
  2020-07-15  6:47         ` Arnd Bergmann
  2020-07-15  4:18       ` Oliver O'Halloran
  1 sibling, 2 replies; 72+ messages in thread
From: Bjorn Helgaas @ 2020-07-14 23:46 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Kjetil Oftedal, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, linux-pci, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Ray Jui, Jens Axboe,
	Ivan Kokshaysky, Boris Ostrovsky, Richard Henderson,
	Juergen Gross, Bjorn Helgaas, Thomas Bogendoerfer, Scott Branden,
	Jingoo Han, Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

[+cc Kjetil]

On Wed, Jul 15, 2020 at 12:01:56AM +0200, Arnd Bergmann wrote:
> On Tue, Jul 14, 2020 at 8:45 PM Bjorn Helgaas <helgaas@kernel.org> wrote:
> > On Mon, Jul 13, 2020 at 05:08:10PM +0200, Arnd Bergmann wrote:
> > > On Mon, Jul 13, 2020 at 3:22 PM Saheed O. Bolarinwa
> > > Starting with a), my first question is whether any high-level
> > > drivers even need to care about errors from these functions. I see
> > > 4913 callers that ignore the return code, and 576 that actually
> > > check it, and almost none care about the specific error (as you
> > > found as well). Unless we conclude that most PCI drivers are wrong,
> > > could we just change the return type to 'void' and assume they never
> > > fail for valid arguments on a valid pci_device* ?
> >
> > I really like this idea.
> >
> > pci_write_config_*() has one return value, and only 100ish of 2500
> > callers check for errors.  It's sometimes possible for config
> > accessors to detect PCI errors and return failure, e.g., device was
> > removed or didn't respond, but most of them don't, and detecting these
> > errors is not really that valuable.
> >
> > pci_read_config_*() is much more interesting because it returns two
> > things, the function return value and the value read from the PCI
> > device, and it's complicated to check both.
> >
> > Again it's sometimes possible for config read accessors to detect PCI
> > errors, but in most cases a PCI error means the accessor returns
> > success and the value from PCI is ~0.
> >
> > Checking the function return value catches programming errors (bad
> > alignment, etc) but misses most of the interesting errors (device was
> > unplugged or reported a PCI error).
> 
> My thinking was more that most of the time the error checking may
> be completely bogus to start with, and I would just not check for
> errors at all.

Yes.  I have no problem with that.  There are a few cases where it's
important to check for errors, e.g., we read a status register and do
something based on a bit being set.  A failure will return all bits
set, and we may do the wrong thing.  But most of the errors we care
about will be on MMIO reads, not config reads, so we can probably
ignore most config read errors.

> > Checking the value returned from PCI is tricky because ~0 is a valid
> > value for some config registers, and only the driver knows for sure.
> > If the driver knows that ~0 is a possible value, it would have to do
> > something else, e.g., another config read of a register that *cannot*
> > be ~0, to see whether it's really an error.
> >
> > I suspect that if we had a single value to look at it would be easier
> > to get right.  Error checking with current interface would look like
> > this:
> >
> >   err = pci_read_config_word(dev, addr, &val);
> >   if (err)
> >     return -EINVAL;
> >
> >   if (PCI_POSSIBLE_ERROR(val)) {
> >     /* if driver knows ~0 is invalid */
> >     return -EINVAL;
> >
> >     /* if ~0 is potentially a valid value */
> >     err = pci_read_config_word(dev, PCI_VENDOR_ID, &val2);
> >     if (err)
> >       return -EINVAL;
> >
> >     if (PCI_POSSIBLE_ERROR(val2))
> >       return -EINVAL;
> >   }
> >
> > Error checking with a possible interface that returned only a single
> > value could look like this:
> >
> >   val = pci_config_read_word(dev, addr);
> >   if (PCI_POSSIBLE_ERROR(val)) {
> >     /* if driver knows ~0 is invalid */
> >     return -EINVAL;
> >
> >     /* if ~0 is potentially a valid value */
> >     val2 = pci_config_read_word(dev, PCI_VENDOR_ID);
> >     if (PCI_POSSIBLE_ERROR(val2))
> >       return -EINVAL;
> >   }
> >
> > Am I understanding you correctly?
> 
> That would require changing all callers of the function, which
> I think would involve changing some 700 files. 

Yeah, that would be a disaster.  So something like:

  void pci_read_config_word(struct pci_dev *dev, int where, u16 *val)

and where we used to return anything non-zero, we just set *val = ~0
instead?  I think we do that already in most, maybe all, cases.

> What I was suggesting was to only change the return type to void and
> categorize all drivers that today check it as either
> 
> a) checking the return code is not helpful, or possibly even
>     wrong, so we just stop doing it. I expect those to be the
>     vast majority of callers, but that could be wrong.
> 
> b) Code that legitimately check the error code and need to
>    take an appropriate action. These could be changed to
>    calling a different interface such as 'pci_bus_read_config_word'
>    or a new 'pci_device_last_error()' function.

Yep, makes sense.

> The reasons I suspect that most callers don't actually need
> to check for errors are:
> 
> - Most error checking is static: PCIBIOS_BAD_REGISTER_NUMBER
>   only happens if you pass an invalid register number, but most
>   callers pass a compile-time constant register number that is
>   known to be correct, or the driver would never work. Similarly,
>   PCIBIOS_DEVICE_NOT_FOUND wouldn't normally happen
>   since you pass a valid pci_device pointer that was already
>   probed.

Yep, except for things like device removal or other PCI errors.

> - config space accesses are very rare compared to memory
>   space access and on the hardware side the error handling
>   would be similar, but readl/writel don't return errors, they just
>   access wrong registers or return 0xffffffff.
>   arch/powerpc/kernel/eeh.c has a ton extra code written to
>   deal with it, but no other architectures do.
> 
> - If we add code to detect errors in pci_read_config_*
>   and do some of the stuff from powerpc's
>   eeh_dev_check_failure(), we are more likely to catch
>   intermittent failures when drivers don't check, or bugs
>   with invalid arguments in device drivers than relying on
>   drivers to get their error handling right when those code
>   paths don't ever get covered in normal testing.

Yeah, this makes sense and sounds like a potential follow-on project.

> Looking at a couple of random drivers that do check the
> return codes, I find:
> 
> drivers/edac/amd8131_edac.c: prints the register number,
> then keeps going. This is not useful
> 
> drivers/net/ethernet/mellanox/mlx4/reset.c: error handling
> in mlx4_reset() seems reasonable, but it gets called
> from mlx4_pci_resume(), which has a 'void' return code and
> cannot propagate the error further. My guess is that it
> would try to keep going after a failed resume and run into
> random other problems then.
> 
> drivers/ata/pata_cs5536.c: error code gets passed to
> caller and then always ignored. Can clearly be changed
> 
> drivers/net/wireless/intersil/prism54/islpci_hotplug.c:
> Out of two calls, only one is checked, which seems bogus
> 
> drivers/usb/host/pci-quirks.c: only one of many instances
> has a check, again this seems bogus.
> 
> drivers/leds/leds-ss4200.c: called from probe(), which
> seems to correctly deal with errors by failing the probe.
> Not sure this can ever fail though, since the driver only does
> it after pci_enable_device() succeeds first. Note that
> pci_enable_device() ignores pci_read_config_byte()
> errors but sanity-checks the register contents/

So maybe a good place to start is by removing some of the useless
error checking for pci_read_config_*() and pci_write_config_*().
That's a decent-sized but not impractical project that could be done
per subsystem or something:

  git grep -E "(if|return|=).*\<pci_(read|write)_config" drivers

finds about 400 matches.

Some of those callers probably really *do* want to check for errors,
and I guess we'd have to identify them and do them separately as you
mentioned.

Bjorn
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 18:45   ` Bjorn Helgaas
                       ` (2 preceding siblings ...)
  2020-07-14 23:14     ` Rob Herring
@ 2020-07-15  2:12     ` Benjamin Herrenschmidt
  3 siblings, 0 replies; 72+ messages in thread
From: Benjamin Herrenschmidt @ 2020-07-15  2:12 UTC (permalink / raw)
  To: Bjorn Helgaas, Arnd Bergmann
  Cc: linux-pci, Keith Busch, Paul Mackerras, sparclinux, Toan Le,
	Greg Ungerer, Marek Vasut, Rob Herring, Lorenzo Pieralisi,
	Sagi Grimberg, Michael Ellerman, Russell King, Ley Foon Tan,
	Christoph Hellwig, Geert Uytterhoeven, Kevin Hilman,
	Jakub Kicinski, Matt Turner, linux-kernel-mentees, Guenter Roeck,
	Ray Jui, Jens Axboe, Ivan Kokshaysky, Boris Ostrovsky,
	Richard Henderson, Juergen Gross, Bjorn Helgaas,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han,
	Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On Tue, 2020-07-14 at 13:45 -0500, Bjorn Helgaas wrote:
> 
> > fail for valid arguments on a valid pci_device* ?
> 
> I really like this idea.
> 
> pci_write_config_*() has one return value, and only 100ish of 2500
> callers check for errors.  It's sometimes possible for config
> accessors to detect PCI errors and return failure, e.g., device was
> removed or didn't respond, but most of them don't, and detecting
> these
> errors is not really that valuable.
> 
> pci_read_config_*() is much more interesting because it returns two
> things, the function return value and the value read from the PCI
> device, and it's complicated to check both. 

  .../...

I agree. It's a mess at the moment.

We have separate mechanism to convey PCI errors (among other things the
channel state) which should apply to config space when detection is
possible.

I think returning all 1's is the right thing to do here and avoids odd
duplicate error detection logic which I bet you is never properly
tested.

> > For b), it might be nice to also change other aspects of the
> > interface, e.g. passing a pci_host_bridge pointer plus bus number
> > instead of a pci_bus pointer, or having the callback in the
> > pci_host_bridge structure.
> 
> I like this idea a lot, too.  I think the fact that
> pci_bus_read_config_word() requires a pci_bus * complicates things in
> a few places.
> 
> I think it's completely separate, as you say, and we should defer it
> for now because even part a) is a lot of work.  I added it to my list
> of possible future projects.

Agreed on both points.

Cheers,
Ben.


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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 21:02     ` Kjetil Oftedal
@ 2020-07-15  2:14       ` Benjamin Herrenschmidt
  0 siblings, 0 replies; 72+ messages in thread
From: Benjamin Herrenschmidt @ 2020-07-15  2:14 UTC (permalink / raw)
  To: Kjetil Oftedal, Bjorn Helgaas
  Cc: linux-pci, Keith Busch, Paul Mackerras, sparclinux, Toan Le,
	Greg Ungerer, Marek Vasut, Rob Herring, Lorenzo Pieralisi,
	Sagi Grimberg, Michael Ellerman, Russell King, Ley Foon Tan,
	Christoph Hellwig, Geert Uytterhoeven, Kevin Hilman,
	Jakub Kicinski, Matt Turner, linux-kernel-mentees, Guenter Roeck,
	Arnd Bergmann, Ray Jui, Jens Axboe, Ivan Kokshaysky,
	Boris Ostrovsky, Richard Henderson, Juergen Gross, Bjorn Helgaas,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han,
	Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On Tue, 2020-07-14 at 23:02 +0200, Kjetil Oftedal wrote:
> > 
> > > For b), it might be nice to also change other aspects of the
> > > interface, e.g. passing a pci_host_bridge pointer plus bus number
> > > instead of a pci_bus pointer, or having the callback in the
> > > pci_host_bridge structure.
> > 
> > I like this idea a lot, too.  I think the fact that
> > pci_bus_read_config_word() requires a pci_bus * complicates things in
> > a few places.
> > 
> > I think it's completely separate, as you say, and we should defer it
> > for now because even part a) is a lot of work.  I added it to my list
> > of possible future projects.
> > 
> 
> What about strange PCI devices such as Non-Transparent bridges?
> They will require their own PCI Config space accessors that is not
> connected to a host bridge if one wants to do some sort of
> punch-through enumeration.
> I guess the kernel doesn't care much about them?

Well, today they would require a pci_bus anyway.. . so if you want to do
that sort of funny trick you may as well create a "virtual" host bridge.

Cheers,
Ben.


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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 23:46       ` Bjorn Helgaas
@ 2020-07-15  2:19         ` Benjamin Herrenschmidt
  2020-07-15  6:47         ` Arnd Bergmann
  1 sibling, 0 replies; 72+ messages in thread
From: Benjamin Herrenschmidt @ 2020-07-15  2:19 UTC (permalink / raw)
  To: Bjorn Helgaas, Arnd Bergmann
  Cc: linux-pci, Keith Busch, Paul Mackerras, sparclinux, Toan Le,
	Kjetil Oftedal, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, Jakub Kicinski, Matt Turner, linux-kernel-mentees,
	Guenter Roeck, Ray Jui, Jens Axboe, Ivan Kokshaysky,
	Boris Ostrovsky, Richard Henderson, Juergen Gross, Bjorn Helgaas,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han,
	Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On Tue, 2020-07-14 at 18:46 -0500, Bjorn Helgaas wrote:
> Yes.  I have no problem with that.  There are a few cases where it's
> important to check for errors, e.g., we read a status register and do
> something based on a bit being set.  A failure will return all bits
> set, and we may do the wrong thing.  But most of the errors we care
> about will be on MMIO reads, not config reads, so we can probably
> ignore most config read errors.

And in both cases, we don't have the plumbing to provide accurate
and reliable error returns for all platforms anyways (esp. not for
MMIO).

I think it makes sense to stick to the good old "if all 1's, then go
out of line" including for config space.

 ../..

> Yep, except for things like device removal or other PCI errors.

A whole bunch of these are reported asynchronously, esp for writes (and
yes, including config writes, they are supposed to be non-posted but
more often than not, the path  from the CPU to the PCI bridge remains
posted for writes including config ones).

> So maybe a good place to start is by removing some of the useless
> error checking for pci_read_config_*() and pci_write_config_*().
> That's a decent-sized but not impractical project that could be done
> per subsystem or something:
> 
>   git grep -E "(if|return|=).*\<pci_(read|write)_config" drivers
> 
> finds about 400 matches.
> 
> Some of those callers probably really *do* want to check for errors,
> and I guess we'd have to identify them and do them separately as you
> mentioned.

I'd be curious about these considering how unreliable our error return
is accross the board.

Cheers,
Ben.


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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 22:01     ` Arnd Bergmann
  2020-07-14 23:46       ` Bjorn Helgaas
@ 2020-07-15  4:18       ` Oliver O'Halloran
  2020-07-15 14:38         ` David Laight
  1 sibling, 1 reply; 72+ messages in thread
From: Oliver O'Halloran @ 2020-07-15  4:18 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: linux-pci, Paul Mackerras, sparclinux, Toan Le,
	Christoph Hellwig, Marek Vasut, Rob Herring, Lorenzo Pieralisi,
	Sagi Grimberg, Kevin Hilman, Russell King, Ley Foon Tan,
	Greg Ungerer, Geert Uytterhoeven, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Bjorn Helgaas, Ray Jui,
	linuxppc-dev, Jens Axboe, Ivan Kokshaysky, Keith Busch,
	Boris Ostrovsky, Richard Henderson, Juergen Gross,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han, linux-kernel,
	Philipp Zabel, Saheed O. Bolarinwa, Gustavo Pimentel,
	Bjorn Helgaas, David S. Miller, Heiner Kallweit

On Wed, Jul 15, 2020 at 8:03 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> - Most error checking is static: PCIBIOS_BAD_REGISTER_NUMBER
>   only happens if you pass an invalid register number, but most
>   callers pass a compile-time constant register number that is
>   known to be correct, or the driver would never work. Similarly,
>   PCIBIOS_DEVICE_NOT_FOUND wouldn't normally happen
>   since you pass a valid pci_device pointer that was already
>   probed.

Having some feedback about obvious programming errors is still useful
when doing driver development. Reporting those via printk() would
probably be more useful to those who care though.

> - config space accesses are very rare compared to memory
>   space access and on the hardware side the error handling
>   would be similar, but readl/writel don't return errors, they just
>   access wrong registers or return 0xffffffff.
>   arch/powerpc/kernel/eeh.c has a ton extra code written to
>   deal with it, but no other architectures do.

TBH the EEH MMIO hooks were probably a mistake to begin with. Errors
detected via MMIO are almost always asynchronous to the error itself
so you usually just wind up with a misleading stack trace rather than
any kind of useful synchronous error reporting. It seems like most
drivers don't bother checking for 0xFFs either and rely on the
asynchronous reporting via .error_detected() instead, so I have to
wonder what the point is. I've been thinking of removing the MMIO
hooks and using a background poller to check for errors on each PHB
periodically (assuming we don't have an EEH interrupt) instead. That
would remove the requirement for eeh_dev_check_failure() to be
interrupt safe too, so it might even let us fix all the godawful races
in EEH.

> - If we add code to detect errors in pci_read_config_*
>   and do some of the stuff from powerpc's
>   eeh_dev_check_failure(), we are more likely to catch
>   intermittent failures when drivers don't check, or bugs
>   with invalid arguments in device drivers than relying on
>   drivers to get their error handling right when those code
>   paths don't ever get covered in normal testing.

Adding some kind of error detection to the generic config accessors
wouldn't hurt, but detection is only half the problem. The main job of
eeh_dev_check_failure() is waking up the EEH recovery thread which
actually handles notifying drivers, device resets, etc and you'd want
something in the PCI core. Right now there's two implementations of
that reporting logic: one for EEH in arch/powerpc/eeh_driver.c and one
for AER/DPC in drivers/pci/pcie/err.c. I think the latter could be
moved into the PCI core easily enough since there's not much about it
that's really specific to PCIe. Ideally we could drop the EEH specific
one too, but I'm not sure how to implement that without it devolving
into callback spaghetti.

Oliver
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-14 23:46       ` Bjorn Helgaas
  2020-07-15  2:19         ` Benjamin Herrenschmidt
@ 2020-07-15  6:47         ` Arnd Bergmann
  2020-07-15 14:24           ` David Laight
  2020-07-15 22:26           ` Benjamin Herrenschmidt
  1 sibling, 2 replies; 72+ messages in thread
From: Arnd Bergmann @ 2020-07-15  6:47 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Kjetil Oftedal, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, linux-pci, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Ray Jui, Jens Axboe,
	Ivan Kokshaysky, Boris Ostrovsky, Richard Henderson,
	Juergen Gross, Bjorn Helgaas, Thomas Bogendoerfer, Scott Branden,
	Jingoo Han, Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On Wed, Jul 15, 2020 at 1:46 AM Bjorn Helgaas <helgaas@kernel.org> wrote:

 So something like:
>
>   void pci_read_config_word(struct pci_dev *dev, int where, u16 *val)
>
> and where we used to return anything non-zero, we just set *val = ~0
> instead?  I think we do that already in most, maybe all, cases.

Right, this is what I had in mind. If we start by removing the handling
of the return code in all files that clearly don't need it, looking at
whatever remains will give a much better idea of what a good interface
should be.

>  git grep -E "(if|return|=).*\<pci_(read|write)_config" drivers
> finds about 400 matches.

Right, and this is some 112 files to look at.

I had a slightly different regex, which found more false-positives, but
also these:

arch/x86/kernel/amd_nb.c:      : pci_read_config_dword(root, 0x64, value));
drivers/i2c/busses/i2c-sis630.c:     pci_write_config_byte(sis630_dev,
SIS630_BIOS_CTL_REG, b | 0x80)) {
drivers/i2c/busses/i2c-viapro.c:     !pci_read_config_word(pdev,
SMBBA2, &vt596_smba) &&
drivers/ide/rz1000.c:     !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
drivers/net/ethernet/realtek/r8169_main.c:
pci_write_config_byte(pdev, 0x070f, val) == PCIBIOS_SUCCESSFUL)
include/linux/rtsx_pci.h:#define rtsx_pci_read_config_dword(pcr,
where, val) pci_read_config_dword((pcr)->pci, where, val)
include/linux/rtsx_pci.h:#define rtsx_pci_write_config_dword(pcr,
where, val) pci_write_config_dword((pcr)->pci, where, val)
drivers/misc/cardreader/rts5261.c:              retval =
rtsx_pci_read_config_dword(pcr,
drivers/misc/cardreader/rts5261.c:      retval =
rtsx_pci_write_config_dword(pcr, PCR_SETTING_REG2, lval);

That last one is interesting because I think this is a case in which we
actually want to check for errors, as the driver seems to use it
to ensure that accessing extended config space at offset 0x814
works before relying on the value. Unfortunately the implementation
seems buggy as it a) keeps using the possibly uninitialized value after
printing a warning and b) returns the PCIBIOS_* value in place of a
negative errno and then ignores it in the caller.

      Arnd
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-15  6:47         ` Arnd Bergmann
@ 2020-07-15 14:24           ` David Laight
  2020-07-15 22:01             ` Bjorn Helgaas
  2020-07-15 22:26           ` Benjamin Herrenschmidt
  1 sibling, 1 reply; 72+ messages in thread
From: David Laight @ 2020-07-15 14:24 UTC (permalink / raw)
  To: 'Arnd Bergmann', Bjorn Helgaas
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Kjetil Oftedal, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, linux-pci, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Ray Jui, Jens Axboe,
	Ivan Kokshaysky, Boris Ostrovsky, Richard Henderson,
	Juergen Gross, Bjorn Helgaas, Thomas Bogendoerfer, Scott Branden,
	Jingoo Han, Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

From: Arnd Bergmann
> Sent: 15 July 2020 07:47
> On Wed, Jul 15, 2020 at 1:46 AM Bjorn Helgaas <helgaas@kernel.org> wrote:
> 
>  So something like:
> >
> >   void pci_read_config_word(struct pci_dev *dev, int where, u16 *val)
> >
> > and where we used to return anything non-zero, we just set *val = ~0
> > instead?  I think we do that already in most, maybe all, cases.
> 
> Right, this is what I had in mind. If we start by removing the handling
> of the return code in all files that clearly don't need it, looking at
> whatever remains will give a much better idea of what a good interface
> should be.

It would be best to get rid of that nasty 'u16 *' parameter.
Make the return int and return the read value or -1 on error.
(Or maybe 0xffff0000 on error??)

For a 32bit read (there must be one for the BARs) returning
a 64bit signed integer would work even for 32bit systems.

If code cares about the error, and it can be detected then
it can check. Otherwise the it all 'just works'.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-15  4:18       ` Oliver O'Halloran
@ 2020-07-15 14:38         ` David Laight
  2020-07-15 22:12           ` Bjorn Helgaas
  0 siblings, 1 reply; 72+ messages in thread
From: David Laight @ 2020-07-15 14:38 UTC (permalink / raw)
  To: 'Oliver O'Halloran', Arnd Bergmann
  Cc: linux-pci, Paul Mackerras, sparclinux, Toan Le,
	Christoph Hellwig, Marek Vasut, Rob Herring, Lorenzo Pieralisi,
	Sagi Grimberg, Kevin Hilman, Russell King, Ley Foon Tan,
	Greg Ungerer, Geert Uytterhoeven, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Bjorn Helgaas, Ray Jui,
	linuxppc-dev, Jens Axboe, Ivan Kokshaysky, Keith Busch,
	Boris Ostrovsky, Richard Henderson, Juergen Gross,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han, linux-kernel,
	Philipp Zabel, Saheed O. Bolarinwa, Gustavo Pimentel,
	Bjorn Helgaas, David S. Miller, Heiner Kallweit

From: Oliver O'Halloran
> Sent: 15 July 2020 05:19
> 
> On Wed, Jul 15, 2020 at 8:03 AM Arnd Bergmann <arnd@arndb.de> wrote:
...
> > - config space accesses are very rare compared to memory
> >   space access and on the hardware side the error handling
> >   would be similar, but readl/writel don't return errors, they just
> >   access wrong registers or return 0xffffffff.
> >   arch/powerpc/kernel/eeh.c has a ton extra code written to
> >   deal with it, but no other architectures do.
> 
> TBH the EEH MMIO hooks were probably a mistake to begin with. Errors
> detected via MMIO are almost always asynchronous to the error itself
> so you usually just wind up with a misleading stack trace rather than
> any kind of useful synchronous error reporting. It seems like most
> drivers don't bother checking for 0xFFs either and rely on the
> asynchronous reporting via .error_detected() instead, so I have to
> wonder what the point is. I've been thinking of removing the MMIO
> hooks and using a background poller to check for errors on each PHB
> periodically (assuming we don't have an EEH interrupt) instead. That
> would remove the requirement for eeh_dev_check_failure() to be
> interrupt safe too, so it might even let us fix all the godawful races
> in EEH.

I've 'played' with PCIe error handling - without much success.
What might be useful is for a driver that has just read ~0u to
be able to ask 'has there been an error signalled for this device?'.

I got an error generated by doing an MMIO access that was inside
the address range forwarded to the slave, but outside any of its BARs.
(Two BARs of different sizes leaves a nice gap.)
This got reported up to the bridge nearest the slave (which supported
error handling), but not to the root bridge (which I don't think does).
ISTR a message about EEH being handled by the hardware (the machine
is up but dmesg is full of messages from a bouncing USB mouse).

With such partial error reporting useful info can still be extracted.

Of course, what actually happens on a PCIe error is that the signal
gets routed to some 'board support logic' and then passed back into
the kernel as an NMI - which then crashes the kernel!
This even happens when the PCIe link goes down after we've done a
soft-remove of the device itself!
Rather makes updating the board's FPGA without a reboot tricky.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-15 14:24           ` David Laight
@ 2020-07-15 22:01             ` Bjorn Helgaas
  2020-07-16  8:18               ` David Laight
  0 siblings, 1 reply; 72+ messages in thread
From: Bjorn Helgaas @ 2020-07-15 22:01 UTC (permalink / raw)
  To: David Laight
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Kjetil Oftedal, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, linux-pci, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, 'Arnd Bergmann',
	Ray Jui, Jens Axboe, Ivan Kokshaysky, Boris Ostrovsky,
	Richard Henderson, Juergen Gross, Bjorn Helgaas,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han,
	Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On Wed, Jul 15, 2020 at 02:24:21PM +0000, David Laight wrote:
> From: Arnd Bergmann
> > Sent: 15 July 2020 07:47
> > On Wed, Jul 15, 2020 at 1:46 AM Bjorn Helgaas <helgaas@kernel.org> wrote:
> > 
> >  So something like:
> > >
> > >   void pci_read_config_word(struct pci_dev *dev, int where, u16 *val)
> > >
> > > and where we used to return anything non-zero, we just set *val = ~0
> > > instead?  I think we do that already in most, maybe all, cases.
> > 
> > Right, this is what I had in mind. If we start by removing the handling
> > of the return code in all files that clearly don't need it, looking at
> > whatever remains will give a much better idea of what a good interface
> > should be.
> 
> It would be best to get rid of that nasty 'u16 *' parameter.

Do you mean nasty because it's basically a return value, but not
returned as the *function's* return value?  I agree that if we were
starting from scratch it would nicer to have:

  u16 pci_read_config_word(struct pci_dev *dev, int where)

but I don't think it's worth changing the thousands of callers just
for that.

> Make the return int and return the read value or -1 on error.
> (Or maybe 0xffff0000 on error??)
> 
> For a 32bit read (there must be one for the BARs) returning
> a 64bit signed integer would work even for 32bit systems.
> 
> If code cares about the error, and it can be detected then
> it can check. Otherwise the it all 'just works'.

There are u8 (byte), u16 (word), and u32 (dword) config reads &
writes.  But I don't think it really helps to return something wider
than the access.  For programmatic errors like invalid alignment, we
could indeed use the extra bits to return an unambiguous error.  But
we still have the "device was unplugged" sort of errors where the
*hardware* typically returns ~0 and the config accessor doesn't know
whether that's valid data or an error.

Bjorn
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-15 14:38         ` David Laight
@ 2020-07-15 22:12           ` Bjorn Helgaas
  2020-07-15 22:49             ` Benjamin Herrenschmidt
  0 siblings, 1 reply; 72+ messages in thread
From: Bjorn Helgaas @ 2020-07-15 22:12 UTC (permalink / raw)
  To: David Laight
  Cc: linux-pci, Paul Mackerras, sparclinux, Toan Le,
	Christoph Hellwig, Marek Vasut, Rob Herring, Lorenzo Pieralisi,
	Sagi Grimberg, Kevin Hilman, Russell King, Ley Foon Tan,
	Greg Ungerer, Geert Uytterhoeven, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Arnd Bergmann, Ray Jui,
	linuxppc-dev, Jens Axboe, Ivan Kokshaysky, Keith Busch,
	Boris Ostrovsky, Richard Henderson, Juergen Gross,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han, linux-kernel,
	Philipp Zabel, Saheed O. Bolarinwa,
	'Oliver O'Halloran',
	Gustavo Pimentel, Bjorn Helgaas, David S. Miller,
	Heiner Kallweit

On Wed, Jul 15, 2020 at 02:38:29PM +0000, David Laight wrote:
> From: Oliver O'Halloran
> > Sent: 15 July 2020 05:19
> > 
> > On Wed, Jul 15, 2020 at 8:03 AM Arnd Bergmann <arnd@arndb.de> wrote:
> ...
> > > - config space accesses are very rare compared to memory
> > >   space access and on the hardware side the error handling
> > >   would be similar, but readl/writel don't return errors, they just
> > >   access wrong registers or return 0xffffffff.
> > >   arch/powerpc/kernel/eeh.c has a ton extra code written to
> > >   deal with it, but no other architectures do.
> > 
> > TBH the EEH MMIO hooks were probably a mistake to begin with. Errors
> > detected via MMIO are almost always asynchronous to the error itself
> > so you usually just wind up with a misleading stack trace rather than
> > any kind of useful synchronous error reporting. It seems like most
> > drivers don't bother checking for 0xFFs either and rely on the
> > asynchronous reporting via .error_detected() instead, so I have to
> > wonder what the point is. I've been thinking of removing the MMIO
> > hooks and using a background poller to check for errors on each PHB
> > periodically (assuming we don't have an EEH interrupt) instead. That
> > would remove the requirement for eeh_dev_check_failure() to be
> > interrupt safe too, so it might even let us fix all the godawful races
> > in EEH.
> 
> I've 'played' with PCIe error handling - without much success.
> What might be useful is for a driver that has just read ~0u to
> be able to ask 'has there been an error signalled for this device?'.

In many cases a driver will know that ~0 is not a valid value for the
register it's reading.  But if ~0 *could* be valid, an interface like
you suggest could be useful.  I don't think we have anything like that
today, but maybe we could.  It would certainly be nice if the PCI core
noticed, logged, and cleared errors.  We have some of that for AER,
but that's an optional feature, and support for the error bits in the
garden-variety PCI_STATUS register is pretty haphazard.  As you note
below, this sort of SERR/PERR reporting is frequently hard-wired in
ways that takes it out of our purview.

Bjorn
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-15  6:47         ` Arnd Bergmann
  2020-07-15 14:24           ` David Laight
@ 2020-07-15 22:26           ` Benjamin Herrenschmidt
  1 sibling, 0 replies; 72+ messages in thread
From: Benjamin Herrenschmidt @ 2020-07-15 22:26 UTC (permalink / raw)
  To: Arnd Bergmann, Bjorn Helgaas
  Cc: linux-pci, Keith Busch, Paul Mackerras, sparclinux, Toan Le,
	Kjetil Oftedal, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, Jakub Kicinski, Matt Turner, linux-kernel-mentees,
	Guenter Roeck, Ray Jui, Jens Axboe, Ivan Kokshaysky,
	Boris Ostrovsky, Richard Henderson, Juergen Gross, Bjorn Helgaas,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han,
	Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

On Wed, 2020-07-15 at 08:47 +0200, Arnd Bergmann wrote:
> drivers/misc/cardreader/rts5261.c:      retval =
> rtsx_pci_write_config_dword(pcr, PCR_SETTING_REG2, lval);
> 
> That last one is interesting because I think this is a case in which
> we
> actually want to check for errors, as the driver seems to use it
> to ensure that accessing extended config space at offset 0x814
> works before relying on the value. Unfortunately the implementation
> seems buggy as it a) keeps using the possibly uninitialized value
> after
> printing a warning and b) returns the PCIBIOS_* value in place of a
> negative errno and then ignores it in the caller.

In cases like this, usually checking against ~0 is sufficient

Cheers,
Ben.


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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-15 22:12           ` Bjorn Helgaas
@ 2020-07-15 22:49             ` Benjamin Herrenschmidt
  2020-07-16  8:07               ` David Laight
  0 siblings, 1 reply; 72+ messages in thread
From: Benjamin Herrenschmidt @ 2020-07-15 22:49 UTC (permalink / raw)
  To: Bjorn Helgaas, David Laight
  Cc: linux-pci, Paul Mackerras, sparclinux, Toan Le,
	Christoph Hellwig, Marek Vasut, Rob Herring, Lorenzo Pieralisi,
	Sagi Grimberg, Kevin Hilman, Russell King, Ley Foon Tan,
	Greg Ungerer, Geert Uytterhoeven, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Arnd Bergmann, Ray Jui,
	linuxppc-dev, Jens Axboe, Ivan Kokshaysky, Keith Busch,
	Boris Ostrovsky, Richard Henderson, Juergen Gross,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han, linux-kernel,
	Philipp Zabel, Saheed O. Bolarinwa,
	'Oliver O'Halloran',
	Gustavo Pimentel, Bjorn Helgaas, David S. Miller,
	Heiner Kallweit

On Wed, 2020-07-15 at 17:12 -0500, Bjorn Helgaas wrote:
> > I've 'played' with PCIe error handling - without much success.
> > What might be useful is for a driver that has just read ~0u to
> > be able to ask 'has there been an error signalled for this device?'.
> 
> In many cases a driver will know that ~0 is not a valid value for the
> register it's reading.  But if ~0 *could* be valid, an interface like
> you suggest could be useful.  I don't think we have anything like that
> today, but maybe we could.  It would certainly be nice if the PCI core
> noticed, logged, and cleared errors.  We have some of that for AER,
> but that's an optional feature, and support for the error bits in the
> garden-variety PCI_STATUS register is pretty haphazard.  As you note
> below, this sort of SERR/PERR reporting is frequently hard-wired in
> ways that takes it out of our purview.

We do have pci_channel_state (via pci_channel_offline()) which covers
the cases where the underlying error handling (such as EEH or unplug)
results in the device being offlined though this tend to be
asynchronous so it might take a few ~0's before you get it.

It's typically used to break potentially infinite loops in some
drivers.

There is no interface to check whether *an* error happened though for
the most cases it will be captured in the status register, which is
harvested (and cleared ?) by some EDAC drivers iirc... 

All this lacks coordination, I agree.

Cheers,
Ben.


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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-15 22:49             ` Benjamin Herrenschmidt
@ 2020-07-16  8:07               ` David Laight
  0 siblings, 0 replies; 72+ messages in thread
From: David Laight @ 2020-07-16  8:07 UTC (permalink / raw)
  To: 'Benjamin Herrenschmidt', Bjorn Helgaas
  Cc: linux-pci, Paul Mackerras, sparclinux, Toan Le,
	Christoph Hellwig, Marek Vasut, Rob Herring, Lorenzo Pieralisi,
	Sagi Grimberg, Kevin Hilman, Russell King, Ley Foon Tan,
	Greg Ungerer, Geert Uytterhoeven, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, Arnd Bergmann, Ray Jui,
	linuxppc-dev, Jens Axboe, Ivan Kokshaysky, Keith Busch,
	Boris Ostrovsky, Richard Henderson, Juergen Gross,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han, linux-kernel,
	Philipp Zabel, Saheed O. Bolarinwa,
	'Oliver O'Halloran',
	Gustavo Pimentel, Bjorn Helgaas, David S. Miller,
	Heiner Kallweit

From: Benjamin Herrenschmidt
> Sent: 15 July 2020 23:49
> On Wed, 2020-07-15 at 17:12 -0500, Bjorn Helgaas wrote:
> > > I've 'played' with PCIe error handling - without much success.
> > > What might be useful is for a driver that has just read ~0u to
> > > be able to ask 'has there been an error signalled for this device?'.
> >
> > In many cases a driver will know that ~0 is not a valid value for the
> > register it's reading.  But if ~0 *could* be valid, an interface like
> > you suggest could be useful.  I don't think we have anything like that
> > today, but maybe we could.  It would certainly be nice if the PCI core
> > noticed, logged, and cleared errors.  We have some of that for AER,
> > but that's an optional feature, and support for the error bits in the
> > garden-variety PCI_STATUS register is pretty haphazard.  As you note
> > below, this sort of SERR/PERR reporting is frequently hard-wired in
> > ways that takes it out of our purview.
> 
> We do have pci_channel_state (via pci_channel_offline()) which covers
> the cases where the underlying error handling (such as EEH or unplug)
> results in the device being offlined though this tend to be
> asynchronous so it might take a few ~0's before you get it.

On one of my systems I don't think the error TLP from the target
made its way past the first bridge - I could see the error in it's
status registers.
But I couldn't find any of the AER status registers in the root bridge.
So I think you'd need a software poll of the bridge registers to
find out (and clear) the error.

The NMI on the dell system (which is supposed to meet some special
NEBS? server requirements) is just stupid.
Too late to be synchronous and impossible for the OS to handle.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86
  2020-07-15 22:01             ` Bjorn Helgaas
@ 2020-07-16  8:18               ` David Laight
  0 siblings, 0 replies; 72+ messages in thread
From: David Laight @ 2020-07-16  8:18 UTC (permalink / raw)
  To: 'Bjorn Helgaas'
  Cc: Benjamin Herrenschmidt, Keith Busch, Paul Mackerras, sparclinux,
	Toan Le, Kjetil Oftedal, Greg Ungerer, Marek Vasut, Rob Herring,
	Lorenzo Pieralisi, Sagi Grimberg, Michael Ellerman, Russell King,
	Ley Foon Tan, Christoph Hellwig, Geert Uytterhoeven,
	Kevin Hilman, linux-pci, Jakub Kicinski, Matt Turner,
	linux-kernel-mentees, Guenter Roeck, 'Arnd Bergmann',
	Ray Jui, Jens Axboe, Ivan Kokshaysky, Boris Ostrovsky,
	Richard Henderson, Juergen Gross, Bjorn Helgaas,
	Thomas Bogendoerfer, Scott Branden, Jingoo Han,
	Saheed O. Bolarinwa, linux-kernel, Philipp Zabel,
	Gustavo Pimentel, linuxppc-dev, David S. Miller, Heiner Kallweit

From: Bjorn Helgaas
> Sent: 15 July 2020 23:02
> 
> On Wed, Jul 15, 2020 at 02:24:21PM +0000, David Laight wrote:
> > From: Arnd Bergmann
> > > Sent: 15 July 2020 07:47
> > > On Wed, Jul 15, 2020 at 1:46 AM Bjorn Helgaas <helgaas@kernel.org> wrote:
> > >
> > >  So something like:
> > > >
> > > >   void pci_read_config_word(struct pci_dev *dev, int where, u16 *val)
> > > >
> > > > and where we used to return anything non-zero, we just set *val = ~0
> > > > instead?  I think we do that already in most, maybe all, cases.
> > >
> > > Right, this is what I had in mind. If we start by removing the handling
> > > of the return code in all files that clearly don't need it, looking at
> > > whatever remains will give a much better idea of what a good interface
> > > should be.
> >
> > It would be best to get rid of that nasty 'u16 *' parameter.
> 
> Do you mean nasty because it's basically a return value, but not
> returned as the *function's* return value?  I agree that if we were
> starting from scratch it would nicer to have:
> 
>   u16 pci_read_config_word(struct pci_dev *dev, int where)
> 
> but I don't think it's worth changing the thousands of callers just
> for that.

It'll shrink the kernel text size somewhat.
It could also be 'fixed' with a static inline.

Actually you don't even want the result to be u16.
Even though the domain of the value is 0..65535 keeping
the type as int (or unsigned int) will save the compiler
having to generate lots of masking instructions.

Code performance here will be overwhelmed by the time taken
for the config space access.
But more generally all local variables should really be
the size of cpu registers.

On x86-64 you need to use 'unsigned int' for anything used
as array subscripts to avoid the 'sign extend' instructions.
In some code paths it may matter...

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 14/35] i2c/busses: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 14/35] i2c/busses: " Saheed O. Bolarinwa
@ 2020-07-17 14:58   ` Jean Delvare
  2020-07-18 19:05     ` Saheed Bolarinwa
  0 siblings, 1 reply; 72+ messages in thread
From: Jean Delvare @ 2020-07-17 14:58 UTC (permalink / raw)
  To: Saheed O. Bolarinwa
  Cc: linux-pci, linux-kernel, helgaas, linux-i2c, linux-kernel-mentees

Hi Saheed,

On Mon, 13 Jul 2020 14:22:26 +0200, Saheed O. Bolarinwa wrote:
> In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
> Their scope should be limited within arch/x86.

Which PCI specification are you talking about here. In my "PCI Local
Bus Revision 2.3" specification (March 29, 2002), chapter 2 is about
Signal Definition and has nothing to do with the BIOS.

> 
> Change all PCIBIOS_SUCCESSFUL to 0
> 
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
> ---
>  drivers/i2c/busses/i2c-ali15x3.c |  4 ++--
>  drivers/i2c/busses/i2c-nforce2.c |  2 +-
>  drivers/i2c/busses/i2c-sis5595.c | 10 +++++-----
>  3 files changed, 8 insertions(+), 8 deletions(-)

Hmmm. That seems to be a lot of changes to solve an essentially
theoretical problem (if a problem at all). I am not familiar enough
with the PCI subsystem to claim that it is fundamentally wrong, but
enough to say I'm skeptical.

PCI is a cross-architecture standard, and we can't possibly have the
return value of core functions such as pci_write_config_word follow
different conventions depending on the architecture, can we? Does
pci_write_config_word() currently return PCIBIOS_SUCCESSFUL on success
on x86 and 0 on success on other architectures? What about errors, do
we return positive, "PCIBIOS-specific" error codes on x86 and negative,
unix-like error codes on other architectures?

> diff --git a/drivers/i2c/busses/i2c-ali15x3.c b/drivers/i2c/busses/i2c-ali15x3.c
> index 02185a1cfa77..359ee3e0864a 100644
> --- a/drivers/i2c/busses/i2c-ali15x3.c
> +++ b/drivers/i2c/busses/i2c-ali15x3.c
> @@ -167,11 +167,11 @@ static int ali15x3_setup(struct pci_dev *ALI15X3_dev)
>  	if(force_addr) {
>  		dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n",
>  			ali15x3_smba);
> -		if (PCIBIOS_SUCCESSFUL != pci_write_config_word(ALI15X3_dev,
> +		if (0 != pci_write_config_word(ALI15X3_dev,
>  								SMBBA,
>  								ali15x3_smba))
>  			goto error;

This leaves the code horribly aligned.

> -		if (PCIBIOS_SUCCESSFUL != pci_read_config_word(ALI15X3_dev,
> +		if (0 != pci_read_config_word(ALI15X3_dev,
>  								SMBBA, &a))
>  			goto error;
>  		if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) {
> diff --git a/drivers/i2c/busses/i2c-nforce2.c b/drivers/i2c/busses/i2c-nforce2.c
> index 777278386f58..385f4f446f36 100644
> --- a/drivers/i2c/busses/i2c-nforce2.c
> +++ b/drivers/i2c/busses/i2c-nforce2.c
> @@ -328,7 +328,7 @@ static int nforce2_probe_smb(struct pci_dev *dev, int bar, int alt_reg,
>  		u16 iobase;
>  
>  		if (pci_read_config_word(dev, alt_reg, &iobase)
> -		    != PCIBIOS_SUCCESSFUL) {
> +		    != 0) {
>  			dev_err(&dev->dev, "Error reading PCI config for %s\n",
>  				name);
>  			return -EIO;
> diff --git a/drivers/i2c/busses/i2c-sis5595.c b/drivers/i2c/busses/i2c-sis5595.c
> index c793a5c14cda..fbe3ee31eae3 100644
> --- a/drivers/i2c/busses/i2c-sis5595.c
> +++ b/drivers/i2c/busses/i2c-sis5595.c
> @@ -176,10 +176,10 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
>  	if (force_addr) {
>  		dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
>  		if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
> -		    != PCIBIOS_SUCCESSFUL)
> +		    != 0)
>  			goto error;
>  		if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
> -		    != PCIBIOS_SUCCESSFUL)
> +		    != 0)
>  			goto error;
>  		if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
>  			/* doesn't work for some chips! */
> @@ -189,15 +189,15 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
>  	}
>  
>  	if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
> -	    != PCIBIOS_SUCCESSFUL)
> +	    != 0)
>  		goto error;
>  	if ((val & 0x80) == 0) {
>  		dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
>  		if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
> -		    != PCIBIOS_SUCCESSFUL)
> +		    != 0)
>  			goto error;
>  		if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
> -		    != PCIBIOS_SUCCESSFUL)
> +		    != 0)
>  			goto error;
>  		if ((val & 0x80) == 0) {
>  			/* doesn't work for some chips? */


-- 
Jean Delvare
SUSE L3 Support
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 15/35] i2c/busses: Tidy Success/Failure checks
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 15/35] i2c/busses: Tidy Success/Failure checks Saheed O. Bolarinwa
@ 2020-07-17 15:11   ` Jean Delvare
  0 siblings, 0 replies; 72+ messages in thread
From: Jean Delvare @ 2020-07-17 15:11 UTC (permalink / raw)
  To: Saheed O. Bolarinwa
  Cc: linux-pci, linux-kernel, helgaas, linux-i2c, linux-kernel-mentees

On Mon, 13 Jul 2020 14:22:27 +0200, Saheed O. Bolarinwa wrote:
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
> ---
> This patch depends on PATCH 15/35

Not possible, as this *is* patch 15/35. Not really worth mentioning
anyway, as it is expected that patches in a given series may depend on
any earlier patch in the same series.

> 
>  drivers/i2c/busses/i2c-ali15x3.c |  5 ++---
>  drivers/i2c/busses/i2c-nforce2.c |  3 +--
>  drivers/i2c/busses/i2c-sis5595.c | 15 +++++----------
>  3 files changed, 8 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-ali15x3.c b/drivers/i2c/busses/i2c-ali15x3.c
> index 359ee3e0864a..c9e779cc184e 100644
> --- a/drivers/i2c/busses/i2c-ali15x3.c
> +++ b/drivers/i2c/busses/i2c-ali15x3.c
> @@ -167,11 +167,10 @@ static int ali15x3_setup(struct pci_dev *ALI15X3_dev)
>  	if(force_addr) {
>  		dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n",
>  			ali15x3_smba);
> -		if (0 != pci_write_config_word(ALI15X3_dev,
> -								SMBBA,
> +		if (pci_write_config_word(ALI15X3_dev, SMBBA,
>  								ali15x3_smba))
>  			goto error;

You can't possibly leave the code with such a ugly alignment and run
away. The whole point of tidying patches it to have more readable code
in the end, right?

> -		if (0 != pci_read_config_word(ALI15X3_dev,
> +		if (pci_read_config_word(ALI15X3_dev,
>  								SMBBA, &a))
>  			goto error;
>  		if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) {
> diff --git a/drivers/i2c/busses/i2c-nforce2.c b/drivers/i2c/busses/i2c-nforce2.c
> index 385f4f446f36..54d2985b7aaf 100644
> --- a/drivers/i2c/busses/i2c-nforce2.c
> +++ b/drivers/i2c/busses/i2c-nforce2.c
> @@ -327,8 +327,7 @@ static int nforce2_probe_smb(struct pci_dev *dev, int bar, int alt_reg,
>  		/* Older incarnations of the device used non-standard BARs */
>  		u16 iobase;
>  
> -		if (pci_read_config_word(dev, alt_reg, &iobase)
> -		    != 0) {
> +		if (pci_read_config_word(dev, alt_reg, &iobase)) {
>  			dev_err(&dev->dev, "Error reading PCI config for %s\n",
>  				name);
>  			return -EIO;
> diff --git a/drivers/i2c/busses/i2c-sis5595.c b/drivers/i2c/busses/i2c-sis5595.c
> index fbe3ee31eae3..b016f48519d3 100644
> --- a/drivers/i2c/busses/i2c-sis5595.c
> +++ b/drivers/i2c/busses/i2c-sis5595.c
> @@ -175,11 +175,9 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
>  
>  	if (force_addr) {
>  		dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
> -		if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
> -		    != 0)
> +		if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base))
>  			goto error;
> -		if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
> -		    != 0)
> +		if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a))
>  			goto error;
>  		if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
>  			/* doesn't work for some chips! */
> @@ -188,16 +186,13 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
>  		}
>  	}
>  
> -	if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
> -	    != 0)
> +	if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val))
>  		goto error;
>  	if ((val & 0x80) == 0) {
>  		dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
> -		if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
> -		    != 0)
> +		if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80))
>  			goto error;
> -		if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
> -		    != 0)
> +		if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val))
>  			goto error;
>  		if ((val & 0x80) == 0) {
>  			/* doesn't work for some chips? */

Overall I'd be happy to have a more consistent style for checking
errors on PCI config registers access, so this seems to be going into
the right direction.

-- 
Jean Delvare
SUSE L3 Support
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 14/35] i2c/busses: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-17 14:58   ` Jean Delvare
@ 2020-07-18 19:05     ` Saheed Bolarinwa
  2020-07-22 11:06       ` Wolfram Sang
  0 siblings, 1 reply; 72+ messages in thread
From: Saheed Bolarinwa @ 2020-07-18 19:05 UTC (permalink / raw)
  To: Jean Delvare
  Cc: linux-pci, linux-kernel, helgaas, linux-i2c, linux-kernel-mentees


On 7/17/20 4:58 PM, Jean Delvare wrote:

> Which PCI specification are you talking about here. In my "PCI Local
> Bus Revision 2.3" specification (March 29, 2002), chapter 2 is about
> Signal Definition and has nothing to do with the BIOS.
http://read.pudn.com/downloads211/doc/comm/994029/pcifw_r3_0_updated.pdf
>> Change all PCIBIOS_SUCCESSFUL to 0
>>
>> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
>> ---
>>   drivers/i2c/busses/i2c-ali15x3.c |  4 ++--
>>   drivers/i2c/busses/i2c-nforce2.c |  2 +-
>>   drivers/i2c/busses/i2c-sis5595.c | 10 +++++-----
>>   3 files changed, 8 insertions(+), 8 deletions(-)
> Hmmm. That seems to be a lot of changes to solve an essentially
> theoretical problem (if a problem at all). I am not familiar enough
> with the PCI subsystem to claim that it is fundamentally wrong, but
> enough to say I'm skeptical.
>
> PCI is a cross-architecture standard, and we can't possibly have the
> return value of core functions such as pci_write_config_word follow
> different conventions depending on the architecture, can we? Does
> pci_write_config_word() currently return PCIBIOS_SUCCESSFUL on success
> on x86 and 0 on success on other architectures? What about errors, do
> we return positive, "PCIBIOS-specific" error codes on x86 and negative,
> unix-like error codes on other architectures?

Unfortunately, the cover letter did not go through. I have resent it now:

https://lore.kernel.org/linux-i2c/20200718184558.110942-1-refactormyself@gmail.com/T/#u

Here is a discussion thread on it:

https://lore.kernel.org/linux-pci/fb40545a8de8df8914df40d7d6167752c5244ce6.camel@kernel.crashing.org/T/#t

>> diff --git a/drivers/i2c/busses/i2c-ali15x3.c b/drivers/i2c/busses/i2c-ali15x3.c
>> index 02185a1cfa77..359ee3e0864a 100644
>> --- a/drivers/i2c/busses/i2c-ali15x3.c
>> +++ b/drivers/i2c/busses/i2c-ali15x3.c
>> @@ -167,11 +167,11 @@ static int ali15x3_setup(struct pci_dev *ALI15X3_dev)
>>   	if(force_addr) {
>>   		dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n",
>>   			ali15x3_smba);
>> -		if (PCIBIOS_SUCCESSFUL != pci_write_config_word(ALI15X3_dev,
>> +		if (0 != pci_write_config_word(ALI15X3_dev,
>>   								SMBBA,
>>   								ali15x3_smba))
>>   			goto error;
> This leaves the code horribly aligned.

Sorry about that, lessons learnt.

Thank you for the review.

- Saheed

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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 24/35] sh: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 24/35] sh: " Saheed O. Bolarinwa
@ 2020-07-20 21:41   ` Rich Felker
  0 siblings, 0 replies; 72+ messages in thread
From: Rich Felker @ 2020-07-20 21:41 UTC (permalink / raw)
  To: Saheed O. Bolarinwa
  Cc: Yoshinori Sato, linux-sh, linux-pci, linux-kernel, helgaas,
	linux-kernel-mentees

On Mon, Jul 13, 2020 at 02:22:36PM +0200, Saheed O. Bolarinwa wrote:
> In reference to the PCI spec (Chapter 2), PCIBIOS* is an x86 concept.
> Their scope should be limited within arch/x86.
> 
> Change all PCIBIOS_SUCCESSFUL to 0
> 
> Signed-off-by: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
> ---
>  arch/sh/drivers/pci/common.c        | 2 +-
>  arch/sh/drivers/pci/ops-dreamcast.c | 4 ++--
>  arch/sh/drivers/pci/ops-sh4.c       | 4 ++--
>  arch/sh/drivers/pci/ops-sh7786.c    | 8 ++++----
>  arch/sh/drivers/pci/pci.c           | 2 +-
>  5 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/sh/drivers/pci/common.c b/arch/sh/drivers/pci/common.c
> index fe163ecd0719..ee27cdfd3e68 100644
> --- a/arch/sh/drivers/pci/common.c
> +++ b/arch/sh/drivers/pci/common.c
> @@ -61,7 +61,7 @@ int __init pci_is_66mhz_capable(struct pci_channel *hose,
>  			continue;
>  		if (early_read_config_word(hose, top_bus, current_bus,
>  					   pci_devfn, PCI_VENDOR_ID, &vid) !=
> -		    PCIBIOS_SUCCESSFUL)
> +		    0)
>  			continue;
>  		if (vid == 0xffff)
>  			continue;
> diff --git a/arch/sh/drivers/pci/ops-dreamcast.c b/arch/sh/drivers/pci/ops-dreamcast.c
> index 517a8a9702f6..431cd006951f 100644
> --- a/arch/sh/drivers/pci/ops-dreamcast.c
> +++ b/arch/sh/drivers/pci/ops-dreamcast.c
> @@ -56,7 +56,7 @@ static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int
>  	case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break;
>  	}
>  
> -        return PCIBIOS_SUCCESSFUL;
> +	return 0;
>  }
>  
>  static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
> @@ -70,7 +70,7 @@ static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int
>  	case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break;
>  	}
>  
> -        return PCIBIOS_SUCCESSFUL;
> +	return 0;
>  }
>  
>  struct pci_ops gapspci_pci_ops = {
> diff --git a/arch/sh/drivers/pci/ops-sh4.c b/arch/sh/drivers/pci/ops-sh4.c
> index a205be3bfc4a..4d757e5f38c6 100644
> --- a/arch/sh/drivers/pci/ops-sh4.c
> +++ b/arch/sh/drivers/pci/ops-sh4.c
> @@ -49,7 +49,7 @@ static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
>  		return PCIBIOS_FUNC_NOT_SUPPORTED;
>  	}
>  
> -	return PCIBIOS_SUCCESSFUL;
> +	return 0;
>  }
>  
>  /*
> @@ -90,7 +90,7 @@ static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
>  
>  	pci_write_reg(chan, data, SH4_PCIPDR);
>  
> -	return PCIBIOS_SUCCESSFUL;
> +	return 0;
>  }
>  
>  struct pci_ops sh4_pci_ops = {
> diff --git a/arch/sh/drivers/pci/ops-sh7786.c b/arch/sh/drivers/pci/ops-sh7786.c
> index a10f9f4ebd7f..7c329e467360 100644
> --- a/arch/sh/drivers/pci/ops-sh7786.c
> +++ b/arch/sh/drivers/pci/ops-sh7786.c
> @@ -52,7 +52,7 @@ static int sh7786_pcie_config_access(unsigned char access_type,
>  			else
>  				pci_write_reg(chan, *data, PCI_REG(reg));
>  
> -			return PCIBIOS_SUCCESSFUL;
> +			return 0;
>  		} else if (dev > 1)
>  			return PCIBIOS_DEVICE_NOT_FOUND;
>  	}
> @@ -83,7 +83,7 @@ static int sh7786_pcie_config_access(unsigned char access_type,
>  	/* Disable the configuration access */
>  	pci_write_reg(chan, 0, SH4A_PCIEPCTLR);
>  
> -	return PCIBIOS_SUCCESSFUL;
> +	return 0;
>  }
>  
>  static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,
> @@ -101,7 +101,7 @@ static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,
>  	raw_spin_lock_irqsave(&pci_config_lock, flags);
>  	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
>  					devfn, where, &data);
> -	if (ret != PCIBIOS_SUCCESSFUL) {
> +	if (ret != 0) {
>  		*val = 0xffffffff;
>  		goto out;
>  	}
> @@ -137,7 +137,7 @@ static int sh7786_pcie_write(struct pci_bus *bus, unsigned int devfn,
>  	raw_spin_lock_irqsave(&pci_config_lock, flags);
>  	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
>  					devfn, where, &data);
> -	if (ret != PCIBIOS_SUCCESSFUL)
> +	if (ret != 0)
>  		goto out;
>  
>  	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x "
> diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
> index c7784e156964..77130f035fdd 100644
> --- a/arch/sh/drivers/pci/pci.c
> +++ b/arch/sh/drivers/pci/pci.c
> @@ -204,7 +204,7 @@ pcibios_bus_report_status_early(struct pci_channel *hose,
>  			continue;
>  		ret = early_read_config_word(hose, top_bus, current_bus,
>  					     pci_devfn, PCI_STATUS, &status);
> -		if (ret != PCIBIOS_SUCCESSFUL)
> +		if (ret != 0)
>  			continue;
>  		if (status == 0xffff)
>  			continue;
> -- 
> 2.18.2

Acked-by: Rich Felker <dalias@libc.org>

(for both this and the following one in the series)
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^ permalink raw reply	[flat|nested] 72+ messages in thread

* Re: [Linux-kernel-mentees] [RFC PATCH 14/35] i2c/busses: Change PCIBIOS_SUCCESSFUL to 0
  2020-07-18 19:05     ` Saheed Bolarinwa
@ 2020-07-22 11:06       ` Wolfram Sang
  0 siblings, 0 replies; 72+ messages in thread
From: Wolfram Sang @ 2020-07-22 11:06 UTC (permalink / raw)
  To: Saheed Bolarinwa
  Cc: linux-pci, linux-kernel, helgaas, linux-i2c,
	linux-kernel-mentees, Jean Delvare


[-- Attachment #1.1: Type: text/plain, Size: 187 bytes --]


> Sorry about that, lessons learnt.

I'll mark the I2C patches as RFC for me. If you resend them, please
mention if I should pick them or if the series shall go in via some
other tree.


[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

[-- Attachment #2: Type: text/plain, Size: 201 bytes --]

_______________________________________________
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^ permalink raw reply	[flat|nested] 72+ messages in thread

end of thread, other threads:[~2020-07-22 11:06 UTC | newest]

Thread overview: 72+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-13 12:22 [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 01/35] xen-pciback: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 02/35] ssb: " Saheed O. Bolarinwa
2020-07-13 17:16   ` Larry Finger
2020-07-13 19:13     ` Saheed Bolarinwa
2020-07-13 18:29       ` Arnd Bergmann
2020-07-13 18:35       ` Larry Finger
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 03/35] scsi: ipr: " Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 04/35] scsi: ipr: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 05/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 06/35] PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 13:59   ` Gustavo Pimentel
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 07/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 08/35] PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 09/35] nvme-pci: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 16:42   ` Rajashekar, Revanth
2020-07-13 18:24     ` Saheed Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 10/35] nvme-pci: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 11/35] r8169: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 12/35] r8169: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 13:45   ` Heiner Kallweit
2020-07-13 13:09     ` Saheed Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 13/35] cxl: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 14/35] i2c/busses: " Saheed O. Bolarinwa
2020-07-17 14:58   ` Jean Delvare
2020-07-18 19:05     ` Saheed Bolarinwa
2020-07-22 11:06       ` Wolfram Sang
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 15/35] i2c/busses: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-17 15:11   ` Jean Delvare
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 16/35] hwmon: (sis5595) Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-14  5:02   ` Guenter Roeck
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 17/35] hwmon: (sis5595) Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-14  5:04   ` Guenter Roeck
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 18/35] bcma: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 19/35] atm: " Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 20/35] atm: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 21/35] atm: Fix Style ERROR- assignment in if condition Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 22/35] unicore32: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 23/35] sparc/PCI: " Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 24/35] sh: " Saheed O. Bolarinwa
2020-07-20 21:41   ` Rich Felker
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 25/35] sh: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 26/35] powerpc: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 27/35] powerpc: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 28/35] mips: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 29/35] mips: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 30/35] microblaze: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 31/35] m68k: " Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 32/35] arm/PCI: " Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 33/35] arm/PCI: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 34/35] PCI: Change PCIBIOS_SUCCESSFUL to 0 Saheed O. Bolarinwa
2020-07-13 12:22 ` [Linux-kernel-mentees] [RFC PATCH 35/35] alpha: Tidy Success/Failure checks Saheed O. Bolarinwa
2020-07-13 15:08 ` [Linux-kernel-mentees] [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86 Arnd Bergmann
2020-07-14 18:45   ` Bjorn Helgaas
2020-07-14 21:02     ` Kjetil Oftedal
2020-07-15  2:14       ` Benjamin Herrenschmidt
2020-07-14 22:01     ` Arnd Bergmann
2020-07-14 23:46       ` Bjorn Helgaas
2020-07-15  2:19         ` Benjamin Herrenschmidt
2020-07-15  6:47         ` Arnd Bergmann
2020-07-15 14:24           ` David Laight
2020-07-15 22:01             ` Bjorn Helgaas
2020-07-16  8:18               ` David Laight
2020-07-15 22:26           ` Benjamin Herrenschmidt
2020-07-15  4:18       ` Oliver O'Halloran
2020-07-15 14:38         ` David Laight
2020-07-15 22:12           ` Bjorn Helgaas
2020-07-15 22:49             ` Benjamin Herrenschmidt
2020-07-16  8:07               ` David Laight
2020-07-14 23:14     ` Rob Herring
2020-07-15  2:12     ` Benjamin Herrenschmidt
2020-07-13 22:01 ` Bjorn Helgaas

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