[PATCH] PCI: Remove pci_try_set_mwi

[Heiner Kallweit <hkallweit1@gmail.com>]

pci_set_mwi() and pci_try_set_mwi() do exactly the same, just that the
former one is declared as __must_check. However also some callers of
pci_set_mwi() have a comment that it's an optional feature. I don't
think there's much sense in this separation and the use of
__must_check. Therefore remove pci_try_set_mwi() and remove the
__must_check attribute from pci_set_mwi().
I don't expect either function to be used in new code anyway.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
patch applies on top of pci/misc for v5.11
---
 Documentation/PCI/pci.rst                     |  5 +----
 drivers/ata/pata_cs5530.c                     |  2 +-
 drivers/ata/sata_mv.c                         |  2 +-
 drivers/dma/dw/pci.c                          |  2 +-
 drivers/dma/hsu/pci.c                         |  2 +-
 drivers/ide/cs5530.c                          |  2 +-
 drivers/mfd/intel-lpss-pci.c                  |  2 +-
 drivers/net/ethernet/adaptec/starfire.c       |  2 +-
 drivers/net/ethernet/alacritech/slicoss.c     |  2 +-
 drivers/net/ethernet/dec/tulip/tulip_core.c   |  5 +----
 drivers/net/ethernet/sun/cassini.c            |  4 ++--
 drivers/net/wireless/intersil/p54/p54pci.c    |  2 +-
 .../intersil/prism54/islpci_hotplug.c         |  3 +--
 .../wireless/realtek/rtl818x/rtl8180/dev.c    |  2 +-
 drivers/pci/pci.c                             | 19 -------------------
 drivers/scsi/3w-9xxx.c                        |  4 ++--
 drivers/scsi/3w-sas.c                         |  4 ++--
 drivers/scsi/csiostor/csio_init.c             |  2 +-
 drivers/scsi/lpfc/lpfc_init.c                 |  2 +-
 drivers/scsi/qla2xxx/qla_init.c               |  8 ++++----
 drivers/scsi/qla2xxx/qla_mr.c                 |  2 +-
 drivers/tty/serial/8250/8250_lpss.c           |  2 +-
 drivers/usb/chipidea/ci_hdrc_pci.c            |  2 +-
 drivers/usb/gadget/udc/amd5536udc_pci.c       |  2 +-
 drivers/usb/gadget/udc/net2280.c              |  2 +-
 drivers/usb/gadget/udc/pch_udc.c              |  2 +-
 include/linux/pci.h                           |  5 ++---
 27 files changed, 33 insertions(+), 60 deletions(-)

diff --git a/Documentation/PCI/pci.rst b/Documentation/PCI/pci.rst
index 814b40f83..120362cc9 100644
--- a/Documentation/PCI/pci.rst
+++ b/Documentation/PCI/pci.rst
@@ -226,10 +226,7 @@ If the PCI device can use the PCI Memory-Write-Invalidate transaction,
 call pci_set_mwi().  This enables the PCI_COMMAND bit for Mem-Wr-Inval
 and also ensures that the cache line size register is set correctly.
 Check the return value of pci_set_mwi() as not all architectures
-or chip-sets may support Memory-Write-Invalidate.  Alternatively,
-if Mem-Wr-Inval would be nice to have but is not required, call
-pci_try_set_mwi() to have the system do its best effort at enabling
-Mem-Wr-Inval.
+or chip-sets may support Memory-Write-Invalidate.
 
 
 Request MMIO/IOP resources
diff --git a/drivers/ata/pata_cs5530.c b/drivers/ata/pata_cs5530.c
index ad75d02b6..8654b3ae1 100644
--- a/drivers/ata/pata_cs5530.c
+++ b/drivers/ata/pata_cs5530.c
@@ -214,7 +214,7 @@ static int cs5530_init_chip(void)
 	}
 
 	pci_set_master(cs5530_0);
-	pci_try_set_mwi(cs5530_0);
+	pci_set_mwi(cs5530_0);
 
 	/*
 	 * Set PCI CacheLineSize to 16-bytes:
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 664ef658a..ee37755ea 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -4432,7 +4432,7 @@ static int mv_pci_init_one(struct pci_dev *pdev,
 	mv_print_info(host);
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 	return ata_host_activate(host, pdev->irq, mv_interrupt, IRQF_SHARED,
 				 IS_GEN_I(hpriv) ? &mv5_sht : &mv6_sht);
 }
diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c
index 1142aa6f8..1c20b7485 100644
--- a/drivers/dma/dw/pci.c
+++ b/drivers/dma/dw/pci.c
@@ -30,7 +30,7 @@ static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
 	}
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 	if (ret)
diff --git a/drivers/dma/hsu/pci.c b/drivers/dma/hsu/pci.c
index 07cc7320a..420dd3706 100644
--- a/drivers/dma/hsu/pci.c
+++ b/drivers/dma/hsu/pci.c
@@ -73,7 +73,7 @@ static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	}
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 	if (ret)
diff --git a/drivers/ide/cs5530.c b/drivers/ide/cs5530.c
index 5bb46e713..5d2c421ab 100644
--- a/drivers/ide/cs5530.c
+++ b/drivers/ide/cs5530.c
@@ -168,7 +168,7 @@ static int init_chipset_cs5530(struct pci_dev *dev)
 	 */
 
 	pci_set_master(cs5530_0);
-	pci_try_set_mwi(cs5530_0);
+	pci_set_mwi(cs5530_0);
 
 	/*
 	 * Set PCI CacheLineSize to 16-bytes:
diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c
index 2d7c588ef..a0c3be750 100644
--- a/drivers/mfd/intel-lpss-pci.c
+++ b/drivers/mfd/intel-lpss-pci.c
@@ -39,7 +39,7 @@ static int intel_lpss_pci_probe(struct pci_dev *pdev,
 
 	/* Probably it is enough to set this for iDMA capable devices only */
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	ret = intel_lpss_probe(&pdev->dev, info);
 	if (ret)
diff --git a/drivers/net/ethernet/adaptec/starfire.c b/drivers/net/ethernet/adaptec/starfire.c
index 555299737..1dbff34c4 100644
--- a/drivers/net/ethernet/adaptec/starfire.c
+++ b/drivers/net/ethernet/adaptec/starfire.c
@@ -679,7 +679,7 @@ static int starfire_init_one(struct pci_dev *pdev,
 	pci_set_master(pdev);
 
 	/* enable MWI -- it vastly improves Rx performance on sparc64 */
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 #ifdef ZEROCOPY
 	/* Starfire can do TCP/UDP checksumming */
diff --git a/drivers/net/ethernet/alacritech/slicoss.c b/drivers/net/ethernet/alacritech/slicoss.c
index 696517eae..544510f57 100644
--- a/drivers/net/ethernet/alacritech/slicoss.c
+++ b/drivers/net/ethernet/alacritech/slicoss.c
@@ -1749,7 +1749,7 @@ static int slic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	slic_configure_pci(pdev);
 
diff --git a/drivers/net/ethernet/dec/tulip/tulip_core.c b/drivers/net/ethernet/dec/tulip/tulip_core.c
index c1dcd6ca1..4f6debb24 100644
--- a/drivers/net/ethernet/dec/tulip/tulip_core.c
+++ b/drivers/net/ethernet/dec/tulip/tulip_core.c
@@ -1193,10 +1193,7 @@ static void tulip_mwi_config(struct pci_dev *pdev, struct net_device *dev)
 	/* if we have any cache line size at all, we can do MRM and MWI */
 	csr0 |= MRM | MWI;
 
-	/* Enable MWI in the standard PCI command bit.
-	 * Check for the case where MWI is desired but not available
-	 */
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	/* read result from hardware (in case bit refused to enable) */
 	pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
diff --git a/drivers/net/ethernet/sun/cassini.c b/drivers/net/ethernet/sun/cassini.c
index 9ff894ba8..9a95ec989 100644
--- a/drivers/net/ethernet/sun/cassini.c
+++ b/drivers/net/ethernet/sun/cassini.c
@@ -4933,14 +4933,14 @@ static int cas_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	pci_cmd &= ~PCI_COMMAND_SERR;
 	pci_cmd |= PCI_COMMAND_PARITY;
 	pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
-	if (pci_try_set_mwi(pdev))
+	if (pci_set_mwi(pdev))
 		pr_warn("Could not enable MWI for %s\n", pci_name(pdev));
 
 	cas_program_bridge(pdev);
 
 	/*
 	 * On some architectures, the default cache line size set
-	 * by pci_try_set_mwi reduces perforamnce.  We have to increase
+	 * by pci_set_mwi reduces performance.  We have to increase
 	 * it for this case.  To start, we'll print some configuration
 	 * data.
 	 */
diff --git a/drivers/net/wireless/intersil/p54/p54pci.c b/drivers/net/wireless/intersil/p54/p54pci.c
index e97ee547b..c76326d1e 100644
--- a/drivers/net/wireless/intersil/p54/p54pci.c
+++ b/drivers/net/wireless/intersil/p54/p54pci.c
@@ -583,7 +583,7 @@ static int p54p_probe(struct pci_dev *pdev,
 	}
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	pci_write_config_byte(pdev, 0x40, 0);
 	pci_write_config_byte(pdev, 0x41, 0);
diff --git a/drivers/net/wireless/intersil/prism54/islpci_hotplug.c b/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
index 31a1e6132..e8087d9a5 100644
--- a/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
+++ b/drivers/net/wireless/intersil/prism54/islpci_hotplug.c
@@ -153,8 +153,7 @@ prism54_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	DEBUG(SHOW_TRACING, "%s: pci_set_master(pdev)\n", DRV_NAME);
 	pci_set_master(pdev);
 
-	/* enable MWI */
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	/* setup the network device interface and its structure */
 	if (!(ndev = islpci_setup(pdev))) {
diff --git a/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c b/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
index 2477e18c7..b259b0b58 100644
--- a/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
+++ b/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
@@ -1871,7 +1871,7 @@ static int rtl8180_probe(struct pci_dev *pdev,
 
 	if (priv->chip_family != RTL818X_CHIP_FAMILY_RTL8180) {
 		priv->band.n_bitrates = ARRAY_SIZE(rtl818x_rates);
-		pci_try_set_mwi(pdev);
+		pci_set_mwi(pdev);
 	}
 
 	if (priv->chip_family != RTL818X_CHIP_FAMILY_RTL8180)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9a5500287..f0ab432d2 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4389,25 +4389,6 @@ int pcim_set_mwi(struct pci_dev *dev)
 }
 EXPORT_SYMBOL(pcim_set_mwi);
 
-/**
- * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
- * @dev: the PCI device for which MWI is enabled
- *
- * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
- * Callers are not required to check the return value.
- *
- * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
- */
-int pci_try_set_mwi(struct pci_dev *dev)
-{
-#ifdef PCI_DISABLE_MWI
-	return 0;
-#else
-	return pci_set_mwi(dev);
-#endif
-}
-EXPORT_SYMBOL(pci_try_set_mwi);
-
 /**
  * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
  * @dev: the PCI device to disable
diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index b4718a1b2..d869485e2 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -2018,7 +2018,7 @@ static int twa_probe(struct pci_dev *pdev, const struct pci_device_id *dev_id)
 	}
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (retval)
@@ -2227,7 +2227,7 @@ static int __maybe_unused twa_resume(struct device *dev)
 
 	printk(KERN_WARNING "3w-9xxx: Resuming host %d.\n", tw_dev->host->host_no);
 
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (retval)
diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
index b8f1848ec..49ca153b8 100644
--- a/drivers/scsi/3w-sas.c
+++ b/drivers/scsi/3w-sas.c
@@ -1571,7 +1571,7 @@ static int twl_probe(struct pci_dev *pdev, const struct pci_device_id *dev_id)
 	}
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (retval)
@@ -1790,7 +1790,7 @@ static int __maybe_unused twl_resume(struct device *dev)
 	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
 
 	printk(KERN_WARNING "3w-sas: Resuming host %d.\n", tw_dev->host->host_no);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (retval)
diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
index 390b07bf9..c20bf44c6 100644
--- a/drivers/scsi/csiostor/csio_init.c
+++ b/drivers/scsi/csiostor/csio_init.c
@@ -201,7 +201,7 @@ csio_pci_init(struct pci_dev *pdev, int *bars)
 		goto err_disable_device;
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (rv)
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index ac67f420e..b4833c0f8 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -6119,7 +6119,7 @@ lpfc_enable_pci_dev(struct lpfc_hba *phba)
 		goto out_disable_device;
 	/* Set up device as PCI master and save state for EEH */
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 	pci_save_state(pdev);
 
 	/* PCIe EEH recovery on powerpc platforms needs fundamental reset */
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 5626e9b69..76019dc2e 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -2356,7 +2356,7 @@ qla2100_pci_config(scsi_qla_host_t *vha)
 	struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;
 
 	pci_set_master(ha->pdev);
-	pci_try_set_mwi(ha->pdev);
+	pci_set_mwi(ha->pdev);
 
 	pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
 	w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
@@ -2388,7 +2388,7 @@ qla2300_pci_config(scsi_qla_host_t *vha)
 	struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;
 
 	pci_set_master(ha->pdev);
-	pci_try_set_mwi(ha->pdev);
+	pci_set_mwi(ha->pdev);
 
 	pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
 	w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
@@ -2469,7 +2469,7 @@ qla24xx_pci_config(scsi_qla_host_t *vha)
 	struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;
 
 	pci_set_master(ha->pdev);
-	pci_try_set_mwi(ha->pdev);
+	pci_set_mwi(ha->pdev);
 
 	pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
 	w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
@@ -2511,7 +2511,7 @@ qla25xx_pci_config(scsi_qla_host_t *vha)
 	struct qla_hw_data *ha = vha->hw;
 
 	pci_set_master(ha->pdev);
-	pci_try_set_mwi(ha->pdev);
+	pci_set_mwi(ha->pdev);
 
 	pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
 	w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
diff --git a/drivers/scsi/qla2xxx/qla_mr.c b/drivers/scsi/qla2xxx/qla_mr.c
index ca7306685..e9763d8e3 100644
--- a/drivers/scsi/qla2xxx/qla_mr.c
+++ b/drivers/scsi/qla2xxx/qla_mr.c
@@ -499,7 +499,7 @@ qlafx00_pci_config(scsi_qla_host_t *vha)
 	struct qla_hw_data *ha = vha->hw;
 
 	pci_set_master(ha->pdev);
-	pci_try_set_mwi(ha->pdev);
+	pci_set_mwi(ha->pdev);
 
 	pci_read_config_word(ha->pdev, PCI_COMMAND, &w);
 	w |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
index 4dee8a9e0..8acc1e5c9 100644
--- a/drivers/tty/serial/8250/8250_lpss.c
+++ b/drivers/tty/serial/8250/8250_lpss.c
@@ -193,7 +193,7 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
 	if (ret)
 		return;
 
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	/* Special DMA address for UART */
 	dma->rx_dma_addr = 0xfffff000;
diff --git a/drivers/usb/chipidea/ci_hdrc_pci.c b/drivers/usb/chipidea/ci_hdrc_pci.c
index d63479e1a..d412fa910 100644
--- a/drivers/usb/chipidea/ci_hdrc_pci.c
+++ b/drivers/usb/chipidea/ci_hdrc_pci.c
@@ -78,7 +78,7 @@ static int ci_hdrc_pci_probe(struct pci_dev *pdev,
 	}
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	/* register a nop PHY */
 	ci->phy = usb_phy_generic_register();
diff --git a/drivers/usb/gadget/udc/amd5536udc_pci.c b/drivers/usb/gadget/udc/amd5536udc_pci.c
index 8d387e0e4..9630ce8d3 100644
--- a/drivers/usb/gadget/udc/amd5536udc_pci.c
+++ b/drivers/usb/gadget/udc/amd5536udc_pci.c
@@ -151,7 +151,7 @@ static int udc_pci_probe(
 	dev->chiprev = pdev->revision;
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	/* init dma pools */
 	if (use_dma) {
diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index fc9f99fe7..e15520698 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -3761,7 +3761,7 @@ static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 			&dev->pci->pcimstctl);
 	/* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	/* ... also flushes any posted pci writes */
 	dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
index a3c1fc924..4a0484a0c 100644
--- a/drivers/usb/gadget/udc/pch_udc.c
+++ b/drivers/usb/gadget/udc/pch_udc.c
@@ -3100,7 +3100,7 @@ static int pch_udc_probe(struct pci_dev *pdev,
 	}
 
 	pci_set_master(pdev);
-	pci_try_set_mwi(pdev);
+	pci_set_mwi(pdev);
 
 	/* device struct setup */
 	spin_lock_init(&dev->lock);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index de75f6a4d..c590f616d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1191,9 +1191,8 @@ void pci_clear_master(struct pci_dev *dev);
 
 int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state);
 int pci_set_cacheline_size(struct pci_dev *dev);
-int __must_check pci_set_mwi(struct pci_dev *dev);
-int __must_check pcim_set_mwi(struct pci_dev *dev);
-int pci_try_set_mwi(struct pci_dev *dev);
+int pci_set_mwi(struct pci_dev *dev);
+int pcim_set_mwi(struct pci_dev *dev);
 void pci_clear_mwi(struct pci_dev *dev);
 void pci_intx(struct pci_dev *dev, int enable);
 bool pci_check_and_mask_intx(struct pci_dev *dev);
-- 
2.29.2