[PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Uwe Kleine-König]

Hello,

struct pci_dev tracks the bound pci driver twice. This series is about
removing this duplication.

The first two patches are just cleanups. The third patch introduces a
wrapper that abstracts access to struct pci_dev->driver. In the next
patch (hopefully) all users are converted to use the new wrapper and
finally the fifth patch removes the duplication.

Note this series is only build tested (allmodconfig on several
architectures).

I'm open to restructure this series if this simplifies things. E.g. the
use of the new wrapper in drivers/pci could be squashed into the patch
introducing the wrapper. Patch 4 could be split by maintainer tree or
squashed into patch 3 completely.

Best regards
Uwe

Uwe Kleine-König (5):
  PCI: Simplify pci_device_remove()
  PCI: Drop useless check from pci_device_probe()
  PCI: Provide wrapper to access a pci_dev's bound driver
  PCI: Adapt all code locations to not use struct pci_dev::driver
    directly
  PCI: Drop duplicated tracking of a pci_dev's bound driver

 arch/powerpc/include/asm/ppc-pci.h            |  3 +-
 arch/powerpc/kernel/eeh_driver.c              | 12 +++--
 arch/x86/events/intel/uncore.c                |  2 +-
 arch/x86/kernel/probe_roms.c                  |  2 +-
 drivers/bcma/host_pci.c                       |  6 ++-
 drivers/crypto/hisilicon/qm.c                 |  2 +-
 drivers/crypto/qat/qat_common/adf_aer.c       |  2 +-
 drivers/message/fusion/mptbase.c              |  4 +-
 drivers/misc/cxl/guest.c                      | 21 ++++----
 drivers/misc/cxl/pci.c                        | 25 ++++++----
 .../ethernet/hisilicon/hns3/hns3_ethtool.c    |  3 +-
 .../ethernet/marvell/prestera/prestera_pci.c  |  2 +-
 drivers/net/ethernet/mellanox/mlxsw/pci.c     |  2 +-
 .../ethernet/netronome/nfp/nfp_net_ethtool.c  |  2 +-
 drivers/pci/iov.c                             | 23 +++++----
 drivers/pci/pci-driver.c                      | 48 +++++++++----------
 drivers/pci/pci.c                             | 10 ++--
 drivers/pci/pcie/err.c                        | 35 +++++++-------
 drivers/pci/xen-pcifront.c                    |  4 +-
 drivers/ssb/pcihost_wrapper.c                 |  7 ++-
 drivers/usb/host/xhci-pci.c                   |  3 +-
 include/linux/pci.h                           |  2 +-
 22 files changed, 121 insertions(+), 99 deletions(-)


base-commit: 2734d6c1b1a089fb593ef6a23d4b70903526fe0c
-- 
2.30.2

[PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Uwe Kleine-König]

Hello,

struct pci_dev tracks the bound pci driver twice. This series is about
removing this duplication.

The first two patches are just cleanups. The third patch introduces a
wrapper that abstracts access to struct pci_dev->driver. In the next
patch (hopefully) all users are converted to use the new wrapper and
finally the fifth patch removes the duplication.

Note this series is only build tested (allmodconfig on several
architectures).

I'm open to restructure this series if this simplifies things. E.g. the
use of the new wrapper in drivers/pci could be squashed into the patch
introducing the wrapper. Patch 4 could be split by maintainer tree or
squashed into patch 3 completely.

Best regards
Uwe

Uwe Kleine-König (5):
  PCI: Simplify pci_device_remove()
  PCI: Drop useless check from pci_device_probe()
  PCI: Provide wrapper to access a pci_dev's bound driver
  PCI: Adapt all code locations to not use struct pci_dev::driver
    directly
  PCI: Drop duplicated tracking of a pci_dev's bound driver

 arch/powerpc/include/asm/ppc-pci.h            |  3 +-
 arch/powerpc/kernel/eeh_driver.c              | 12 +++--
 arch/x86/events/intel/uncore.c                |  2 +-
 arch/x86/kernel/probe_roms.c                  |  2 +-
 drivers/bcma/host_pci.c                       |  6 ++-
 drivers/crypto/hisilicon/qm.c                 |  2 +-
 drivers/crypto/qat/qat_common/adf_aer.c       |  2 +-
 drivers/message/fusion/mptbase.c              |  4 +-
 drivers/misc/cxl/guest.c                      | 21 ++++----
 drivers/misc/cxl/pci.c                        | 25 ++++++----
 .../ethernet/hisilicon/hns3/hns3_ethtool.c    |  3 +-
 .../ethernet/marvell/prestera/prestera_pci.c  |  2 +-
 drivers/net/ethernet/mellanox/mlxsw/pci.c     |  2 +-
 .../ethernet/netronome/nfp/nfp_net_ethtool.c  |  2 +-
 drivers/pci/iov.c                             | 23 +++++----
 drivers/pci/pci-driver.c                      | 48 +++++++++----------
 drivers/pci/pci.c                             | 10 ++--
 drivers/pci/pcie/err.c                        | 35 +++++++-------
 drivers/pci/xen-pcifront.c                    |  4 +-
 drivers/ssb/pcihost_wrapper.c                 |  7 ++-
 drivers/usb/host/xhci-pci.c                   |  3 +-
 include/linux/pci.h                           |  2 +-
 22 files changed, 121 insertions(+), 99 deletions(-)


base-commit: 2734d6c1b1a089fb593ef6a23d4b70903526fe0c
-- 
2.30.2

[PATCH v1 1/5] PCI: Simplify pci_device_remove()

[Uwe Kleine-König]

When the driver core calls pci_device_remove() there is a driver that bound
the device and so pci_dev->driver is never NULL.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pci/pci-driver.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 3a72352aa5cf..5808fc6f258e 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -445,16 +445,14 @@ static int pci_device_remove(struct device *dev)
 	struct pci_dev *pci_dev = to_pci_dev(dev);
 	struct pci_driver *drv = pci_dev->driver;
 
-	if (drv) {
-		if (drv->remove) {
-			pm_runtime_get_sync(dev);
-			drv->remove(pci_dev);
-			pm_runtime_put_noidle(dev);
-		}
-		pcibios_free_irq(pci_dev);
-		pci_dev->driver = NULL;
-		pci_iov_remove(pci_dev);
+	if (drv->remove) {
+		pm_runtime_get_sync(dev);
+		drv->remove(pci_dev);
+		pm_runtime_put_noidle(dev);
 	}
+	pcibios_free_irq(pci_dev);
+	pci_dev->driver = NULL;
+	pci_iov_remove(pci_dev);
 
 	/* Undo the runtime PM settings in local_pci_probe() */
 	pm_runtime_put_sync(dev);
-- 
2.30.2

[PATCH v1 2/5] PCI: Drop useless check from pci_device_probe()

[Uwe Kleine-König]

When the device core calls the probe callback for a device the device is
never bound and so !pci_dev->driver is always true.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pci/pci-driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 5808fc6f258e..7dff574bb2fa 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -383,7 +383,7 @@ static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
 	const struct pci_device_id *id;
 	int error = 0;
 
-	if (!pci_dev->driver && drv->probe) {
+	if (drv->probe) {
 		error = -ENODEV;
 
 		id = pci_match_device(drv, pci_dev);
-- 
2.30.2

[PATCH v1 3/5] PCI: Provide wrapper to access a pci_dev's bound driver

[Uwe Kleine-König]

Which driver a device is bound to is available twice: In struct
pci_dev::dev->driver and in struct pci_dev::driver. To get rid of the
duplication introduce a wrapper to access struct pci_dev's driver
member. Once all users are converted the wrapper can be changed to
calculate the driver using pci_dev::dev->driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 include/linux/pci.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 540b377ca8f6..778f3b5e6f23 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -887,6 +887,7 @@ struct pci_driver {
 };
 
 #define	to_pci_driver(drv) container_of(drv, struct pci_driver, driver)
+#define pci_driver_of_dev(pdev) ((pdev)->driver)
 
 /**
  * PCI_DEVICE - macro used to describe a specific PCI device
-- 
2.30.2

[PATCH v1 4/5] PCI: Adapt all code locations to not use struct pci_dev::driver directly

[Uwe Kleine-König]

This prepares removing the driver member of struct pci_dev which holds the
same information than struct pci_dev::dev->driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 arch/powerpc/include/asm/ppc-pci.h            |  3 +-
 arch/powerpc/kernel/eeh_driver.c              | 12 ++++---
 arch/x86/events/intel/uncore.c                |  2 +-
 arch/x86/kernel/probe_roms.c                  |  2 +-
 drivers/bcma/host_pci.c                       |  6 ++--
 drivers/crypto/hisilicon/qm.c                 |  2 +-
 drivers/crypto/qat/qat_common/adf_aer.c       |  2 +-
 drivers/message/fusion/mptbase.c              |  4 +--
 drivers/misc/cxl/guest.c                      | 21 +++++------
 drivers/misc/cxl/pci.c                        | 25 +++++++------
 .../ethernet/hisilicon/hns3/hns3_ethtool.c    |  3 +-
 .../ethernet/marvell/prestera/prestera_pci.c  |  2 +-
 drivers/net/ethernet/mellanox/mlxsw/pci.c     |  2 +-
 .../ethernet/netronome/nfp/nfp_net_ethtool.c  |  2 +-
 drivers/pci/iov.c                             | 23 +++++++-----
 drivers/pci/pci-driver.c                      | 28 ++++++++-------
 drivers/pci/pci.c                             | 10 +++---
 drivers/pci/pcie/err.c                        | 35 ++++++++++---------
 drivers/pci/xen-pcifront.c                    |  4 +--
 drivers/ssb/pcihost_wrapper.c                 |  7 ++--
 drivers/usb/host/xhci-pci.c                   |  3 +-
 21 files changed, 113 insertions(+), 85 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h
index 2b9edbf6e929..63938c156c57 100644
--- a/arch/powerpc/include/asm/ppc-pci.h
+++ b/arch/powerpc/include/asm/ppc-pci.h
@@ -57,7 +57,8 @@ void eeh_sysfs_remove_device(struct pci_dev *pdev);
 
 static inline const char *eeh_driver_name(struct pci_dev *pdev)
 {
-	return (pdev && pdev->driver) ? pdev->driver->name : "<null>";
+	struct pci_driver *pdrv;
+	return (pdev && (pdrv = pci_driver_of_dev(pdev))) ? pdrv->name : "<null>";
 }
 
 #endif /* CONFIG_EEH */
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index 3eff6a4888e7..0fc712a8775e 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -104,13 +104,14 @@ static bool eeh_edev_actionable(struct eeh_dev *edev)
  */
 static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev)
 {
-	if (!pdev || !pdev->driver)
+	struct pci_driver *pdrv;
+	if (!pdev || !(pdrv = pci_driver_of_dev(pdev)))
 		return NULL;
 
-	if (!try_module_get(pdev->driver->driver.owner))
+	if (!try_module_get(pdrv->driver.owner))
 		return NULL;
 
-	return pdev->driver;
+	return pdrv;
 }
 
 /**
@@ -122,10 +123,11 @@ static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev)
  */
 static inline void eeh_pcid_put(struct pci_dev *pdev)
 {
-	if (!pdev || !pdev->driver)
+	struct pci_driver *pdrv;
+	if (!pdev || !(pdrv = pci_driver_of_dev(pdev)))
 		return;
 
-	module_put(pdev->driver->driver.owner);
+	module_put(pdrv->driver.owner);
 }
 
 /**
diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 9bf4dbbc26e2..14eb141b6cf2 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -1176,7 +1176,7 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id
 	 * PCI slot and func to indicate the uncore box.
 	 */
 	if (id->driver_data & ~0xffff) {
-		struct pci_driver *pci_drv = pdev->driver;
+		struct pci_driver *pci_drv = pci_driver_of_dev(pdev);
 
 		pmu = uncore_pci_find_dev_pmu(pdev, pci_drv->id_table);
 		if (pmu == NULL)
diff --git a/arch/x86/kernel/probe_roms.c b/arch/x86/kernel/probe_roms.c
index 9e1def3744f2..55bfafec9684 100644
--- a/arch/x86/kernel/probe_roms.c
+++ b/arch/x86/kernel/probe_roms.c
@@ -80,7 +80,7 @@ static struct resource video_rom_resource = {
  */
 static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short device)
 {
-	struct pci_driver *drv = pdev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pdev);
 	const struct pci_device_id *id;
 
 	if (pdev->vendor == vendor && pdev->device == device)
diff --git a/drivers/bcma/host_pci.c b/drivers/bcma/host_pci.c
index 69c10a7b7c61..f9bfae87ebd9 100644
--- a/drivers/bcma/host_pci.c
+++ b/drivers/bcma/host_pci.c
@@ -161,6 +161,7 @@ static int bcma_host_pci_probe(struct pci_dev *dev,
 			       const struct pci_device_id *id)
 {
 	struct bcma_bus *bus;
+	struct pci_driver *pdrv;
 	int err = -ENOMEM;
 	const char *name;
 	u32 val;
@@ -176,8 +177,9 @@ static int bcma_host_pci_probe(struct pci_dev *dev,
 		goto err_kfree_bus;
 
 	name = dev_name(&dev->dev);
-	if (dev->driver && dev->driver->name)
-		name = dev->driver->name;
+	pdrv = pci_driver_of_dev(dev);
+	if (pdrv && pdrv->name)
+		name = pdrv->name;
 	err = pci_request_regions(dev, name);
 	if (err)
 		goto err_pci_disable;
diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 1d67f94a1d56..303cc546f466 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -3003,7 +3003,7 @@ static int qm_alloc_uacce(struct hisi_qm *qm)
 	};
 	int ret;
 
-	ret = strscpy(interface.name, pdev->driver->name,
+	ret = strscpy(interface.name, pci_driver_of_dev(pdev)->name,
 		      sizeof(interface.name));
 	if (ret < 0)
 		return -ENAMETOOLONG;
diff --git a/drivers/crypto/qat/qat_common/adf_aer.c b/drivers/crypto/qat/qat_common/adf_aer.c
index d2ae293d0df6..162c2b9ef93d 100644
--- a/drivers/crypto/qat/qat_common/adf_aer.c
+++ b/drivers/crypto/qat/qat_common/adf_aer.c
@@ -185,7 +185,7 @@ static const struct pci_error_handlers adf_err_handler = {
 int adf_enable_aer(struct adf_accel_dev *accel_dev)
 {
 	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
-	struct pci_driver *pdrv = pdev->driver;
+	struct pci_driver *pdrv = pci_driver_of_dev(pdev);
 
 	pdrv->err_handler = &adf_err_handler;
 	pci_enable_pcie_error_reporting(pdev);
diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 7f7abc9069f7..181e2927a719 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -838,8 +838,8 @@ mpt_device_driver_register(struct mpt_pci_driver * dd_cbfunc, u8 cb_idx)
 
 	/* call per pci device probe entry point */
 	list_for_each_entry(ioc, &ioc_list, list) {
-		id = ioc->pcidev->driver ?
-		    ioc->pcidev->driver->id_table : NULL;
+		struct pci_driver *pdrv = pci_driver_of_dev(ioc->pcidev);
+		id = pdrv ?  pdrv->id_table : NULL;
 		if (dd_cbfunc->probe)
 			dd_cbfunc->probe(ioc->pcidev, id);
 	 }
diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index 186308f1f8eb..99b969b182b5 100644
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -25,28 +25,29 @@ static void pci_error_handlers(struct cxl_afu *afu,
 		return;
 
 	list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
-		if (!afu_dev->driver)
+		struct pci_driver *afu_drv = pci_driver_of_dev(afu_dev);
+		if (!afu_drv)
 			continue;
 
 		switch (bus_error_event) {
 		case CXL_ERROR_DETECTED_EVENT:
 			afu_dev->error_state = state;
 
-			if (afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->error_detected)
-				afu_dev->driver->err_handler->error_detected(afu_dev, state);
+			if (afu_drv->err_handler &&
+			    afu_drv->err_handler->error_detected)
+				afu_drv->err_handler->error_detected(afu_dev, state);
 		break;
 		case CXL_SLOT_RESET_EVENT:
 			afu_dev->error_state = state;
 
-			if (afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->slot_reset)
-				afu_dev->driver->err_handler->slot_reset(afu_dev);
+			if (afu_drv->err_handler &&
+			    afu_drv->err_handler->slot_reset)
+				afu_drv->err_handler->slot_reset(afu_dev);
 		break;
 		case CXL_RESUME_EVENT:
-			if (afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->resume)
-				afu_dev->driver->err_handler->resume(afu_dev);
+			if (afu_drv->err_handler &&
+			    afu_drv->err_handler->resume)
+				afu_drv->err_handler->resume(afu_dev);
 		break;
 		}
 	}
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 2ba899f5659f..1cf39275029f 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -1805,13 +1805,14 @@ static pci_ers_result_t cxl_vphb_error_detected(struct cxl_afu *afu,
 		return result;
 
 	list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
-		if (!afu_dev->driver)
+		struct pci_driver *afu_drv = pci_driver_of_dev(afu_dev);
+		if (!afu_drv)
 			continue;
 
 		afu_dev->error_state = state;
 
-		if (afu_dev->driver->err_handler)
-			afu_result = afu_dev->driver->err_handler->error_detected(afu_dev,
+		if (afu_drv->err_handler)
+			afu_result = afu_drv->err_handler->error_detected(afu_dev,
 										  state);
 		/* Disconnect trumps all, NONE trumps NEED_RESET */
 		if (afu_result == PCI_ERS_RESULT_DISCONNECT)
@@ -2003,6 +2004,8 @@ static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev)
 			continue;
 
 		list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
+			struct pci_driver *afu_drv;
+
 			/* Reset the device context.
 			 * TODO: make this less disruptive
 			 */
@@ -2028,12 +2031,13 @@ static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev)
 			 * shouldn't start new work until we call
 			 * their resume function.
 			 */
-			if (!afu_dev->driver)
+			afu_drv = pci_driver_of_dev(afu_dev);
+			if (!afu_drv)
 				continue;
 
-			if (afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->slot_reset)
-				afu_result = afu_dev->driver->err_handler->slot_reset(afu_dev);
+			if (afu_drv->err_handler &&
+			    afu_drv->err_handler->slot_reset)
+				afu_result = afu_drv->err_handler->slot_reset(afu_dev);
 
 			if (afu_result == PCI_ERS_RESULT_DISCONNECT)
 				result = PCI_ERS_RESULT_DISCONNECT;
@@ -2074,9 +2078,10 @@ static void cxl_pci_resume(struct pci_dev *pdev)
 			continue;
 
 		list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
-			if (afu_dev->driver && afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->resume)
-				afu_dev->driver->err_handler->resume(afu_dev);
+			struct pci_driver *afu_drv = pci_driver_of_dev(afu_dev);
+			if (afu_drv && afu_drv->err_handler &&
+			    afu_drv->err_handler->resume)
+				afu_drv->err_handler->resume(afu_dev);
 		}
 	}
 	spin_unlock(&adapter->afu_list_lock);
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index 82061ab6930f..833d35e9ed4a 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -593,8 +593,7 @@ static void hns3_get_drvinfo(struct net_device *netdev,
 		return;
 	}
 
-	strncpy(drvinfo->driver, h->pdev->driver->name,
-		sizeof(drvinfo->driver));
+	strncpy(drvinfo->driver, pci_driver_of_dev(h->pdev)->name, sizeof(drvinfo->driver));
 	drvinfo->driver[sizeof(drvinfo->driver) - 1] = '\0';
 
 	strncpy(drvinfo->bus_info, pci_name(h->pdev),
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_pci.c b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
index a250d394da38..180999c2165e 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_pci.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
@@ -720,7 +720,7 @@ static int prestera_fw_load(struct prestera_fw *fw)
 static int prestera_pci_probe(struct pci_dev *pdev,
 			      const struct pci_device_id *id)
 {
-	const char *driver_name = pdev->driver->name;
+	const char *driver_name = pci_driver_of_dev(pdev)->name;
 	struct prestera_fw *fw;
 	int err;
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/pci.c b/drivers/net/ethernet/mellanox/mlxsw/pci.c
index 13b0259f7ea6..d3c1ca840fa7 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/pci.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/pci.c
@@ -1876,7 +1876,7 @@ static void mlxsw_pci_cmd_fini(struct mlxsw_pci *mlxsw_pci)
 
 static int mlxsw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
-	const char *driver_name = pdev->driver->name;
+	const char *driver_name = pci_driver_of_dev(pdev)->name;
 	struct mlxsw_pci *mlxsw_pci;
 	int err;
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
index 1b482446536d..5c25f6af3f62 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -202,7 +202,7 @@ nfp_get_drvinfo(struct nfp_app *app, struct pci_dev *pdev,
 {
 	char nsp_version[ETHTOOL_FWVERS_LEN] = {};
 
-	strlcpy(drvinfo->driver, pdev->driver->name, sizeof(drvinfo->driver));
+	strlcpy(drvinfo->driver, pci_driver_of_dev(pdev)->name, sizeof(drvinfo->driver));
 	nfp_net_get_nspinfo(app, nsp_version);
 	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
 		 "%s %s %s %s", vnic_version, nsp_version,
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index dafdc652fcd0..7c6f0c466df8 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -164,13 +164,14 @@ static ssize_t sriov_vf_total_msix_show(struct device *dev,
 					char *buf)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pci_driver *pdrv = pci_driver_of_dev(pdev);
 	u32 vf_total_msix = 0;
 
 	device_lock(dev);
-	if (!pdev->driver || !pdev->driver->sriov_get_vf_total_msix)
+	if (!pdrv || !pdrv->sriov_get_vf_total_msix)
 		goto unlock;
 
-	vf_total_msix = pdev->driver->sriov_get_vf_total_msix(pdev);
+	vf_total_msix = pdrv->sriov_get_vf_total_msix(pdev);
 unlock:
 	device_unlock(dev);
 	return sysfs_emit(buf, "%u\n", vf_total_msix);
@@ -183,6 +184,7 @@ static ssize_t sriov_vf_msix_count_store(struct device *dev,
 {
 	struct pci_dev *vf_dev = to_pci_dev(dev);
 	struct pci_dev *pdev = pci_physfn(vf_dev);
+	struct pci_driver *pdrv;
 	int val, ret;
 
 	ret = kstrtoint(buf, 0, &val);
@@ -193,13 +195,14 @@ static ssize_t sriov_vf_msix_count_store(struct device *dev,
 		return -EINVAL;
 
 	device_lock(&pdev->dev);
-	if (!pdev->driver || !pdev->driver->sriov_set_msix_vec_count) {
+	pdrv = pci_driver_of_dev(pdev);
+	if (!pdrv || !pdrv->sriov_set_msix_vec_count) {
 		ret = -EOPNOTSUPP;
 		goto err_pdev;
 	}
 
 	device_lock(&vf_dev->dev);
-	if (vf_dev->driver) {
+	if (pci_driver_of_dev(vf_dev)) {
 		/*
 		 * A driver is already attached to this VF and has configured
 		 * itself based on the current MSI-X vector count. Changing
@@ -209,7 +212,7 @@ static ssize_t sriov_vf_msix_count_store(struct device *dev,
 		goto err_dev;
 	}
 
-	ret = pdev->driver->sriov_set_msix_vec_count(vf_dev, val);
+	ret = pdrv->sriov_set_msix_vec_count(vf_dev, val);
 
 err_dev:
 	device_unlock(&vf_dev->dev);
@@ -376,6 +379,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 				  const char *buf, size_t count)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pci_driver *pdrv;
 	int ret;
 	u16 num_vfs;
 
@@ -392,14 +396,15 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 		goto exit;
 
 	/* is PF driver loaded */
-	if (!pdev->driver) {
+	pdrv = pci_driver_of_dev(pdev);
+	if (!pdrv) {
 		pci_info(pdev, "no driver bound to device; cannot configure SR-IOV\n");
 		ret = -ENOENT;
 		goto exit;
 	}
 
 	/* is PF driver loaded w/callback */
-	if (!pdev->driver->sriov_configure) {
+	if (!pdrv->sriov_configure) {
 		pci_info(pdev, "driver does not support SR-IOV configuration via sysfs\n");
 		ret = -ENOENT;
 		goto exit;
@@ -407,7 +412,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 
 	if (num_vfs == 0) {
 		/* disable VFs */
-		ret = pdev->driver->sriov_configure(pdev, 0);
+		ret = pdrv->sriov_configure(pdev, 0);
 		goto exit;
 	}
 
@@ -419,7 +424,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 		goto exit;
 	}
 
-	ret = pdev->driver->sriov_configure(pdev, num_vfs);
+	ret = pdrv->sriov_configure(pdev, num_vfs);
 	if (ret < 0)
 		goto exit;
 
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 7dff574bb2fa..740d5bf5d411 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -443,7 +443,7 @@ static int pci_device_probe(struct device *dev)
 static int pci_device_remove(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 
 	if (drv->remove) {
 		pm_runtime_get_sync(dev);
@@ -480,7 +480,7 @@ static int pci_device_remove(struct device *dev)
 static void pci_device_shutdown(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 
 	pm_runtime_resume(dev);
 
@@ -576,7 +576,7 @@ static int pci_pm_reenable_device(struct pci_dev *pci_dev)
 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 
 	if (drv && drv->suspend) {
 		pci_power_t prev = pci_dev->current_state;
@@ -617,7 +617,7 @@ static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
 static int pci_legacy_resume(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 
 	pci_fixup_device(pci_fixup_resume, pci_dev);
 
@@ -636,7 +636,7 @@ static void pci_pm_default_suspend(struct pci_dev *pci_dev)
 
 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
 {
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 	bool ret = drv && (drv->suspend || drv->resume);
 
 	/*
@@ -1224,16 +1224,17 @@ static int pci_pm_restore(struct device *dev)
 static int pci_pm_runtime_suspend(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct pci_driver *pdrv = pci_driver_of_dev(pci_dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	pci_power_t prev = pci_dev->current_state;
 	int error;
 
 	/*
-	 * If pci_dev->driver is not set (unbound), we leave the device in D0,
+	 * If pdrv is not set (unbound), we leave the device in D0,
 	 * but it may go to D3cold when the bridge above it runtime suspends.
 	 * Save its config space in case that happens.
 	 */
-	if (!pci_dev->driver) {
+	if (!pdrv) {
 		pci_save_state(pci_dev);
 		return 0;
 	}
@@ -1279,6 +1280,7 @@ static int pci_pm_runtime_suspend(struct device *dev)
 static int pci_pm_runtime_resume(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct pci_driver *pdrv = pci_driver_of_dev(pci_dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	pci_power_t prev_state = pci_dev->current_state;
 	int error = 0;
@@ -1290,7 +1292,7 @@ static int pci_pm_runtime_resume(struct device *dev)
 	 */
 	pci_restore_standard_config(pci_dev);
 
-	if (!pci_dev->driver)
+	if (!pdrv)
 		return 0;
 
 	pci_fixup_device(pci_fixup_resume_early, pci_dev);
@@ -1310,13 +1312,14 @@ static int pci_pm_runtime_resume(struct device *dev)
 static int pci_pm_runtime_idle(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct pci_driver *pdrv = pci_driver_of_dev(pci_dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
 	/*
-	 * If pci_dev->driver is not set (unbound), the device should
+	 * If pdrv is not set (unbound), the device should
 	 * always remain in D0 regardless of the runtime PM status
 	 */
-	if (!pci_dev->driver)
+	if (!pdrv)
 		return 0;
 
 	if (!pm)
@@ -1423,8 +1426,9 @@ static struct pci_driver pci_compat_driver = {
  */
 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
 {
-	if (dev->driver)
-		return dev->driver;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
+	if (pdrv)
+		return pdrv;
 	else {
 		int i;
 		for (i = 0; i <= PCI_ROM_RESOURCE; i++)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index aacf575c15cf..9565f6c1bd4f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5069,11 +5069,12 @@ EXPORT_SYMBOL_GPL(pci_dev_unlock);
 
 static void pci_dev_save_and_disable(struct pci_dev *dev)
 {
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 	const struct pci_error_handlers *err_handler =
-			dev->driver ? dev->driver->err_handler : NULL;
+			pdrv ? pdrv->err_handler : NULL;
 
 	/*
-	 * dev->driver->err_handler->reset_prepare() is protected against
+	 * pdrv->err_handler->reset_prepare() is protected against
 	 * races with ->remove() by the device lock, which must be held by
 	 * the caller.
 	 */
@@ -5100,13 +5101,14 @@ static void pci_dev_save_and_disable(struct pci_dev *dev)
 
 static void pci_dev_restore(struct pci_dev *dev)
 {
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 	const struct pci_error_handlers *err_handler =
-			dev->driver ? dev->driver->err_handler : NULL;
+			pdrv ? pdrv->err_handler : NULL;
 
 	pci_restore_state(dev);
 
 	/*
-	 * dev->driver->err_handler->reset_done() is protected against
+	 * err_handler->reset_done() is protected against
 	 * races with ->remove() by the device lock, which must be held by
 	 * the caller.
 	 */
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index b576aa890c76..5b2b7b2972dd 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -51,12 +51,12 @@ static int report_error_detected(struct pci_dev *dev,
 {
 	pci_ers_result_t vote;
 	const struct pci_error_handlers *err_handler;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 
 	device_lock(&dev->dev);
 	if (!pci_dev_set_io_state(dev, state) ||
-		!dev->driver ||
-		!dev->driver->err_handler ||
-		!dev->driver->err_handler->error_detected) {
+		!pdrv || !pdrv->err_handler ||
+		!pdrv->err_handler->error_detected) {
 		/*
 		 * If any device in the subtree does not have an error_detected
 		 * callback, PCI_ERS_RESULT_NO_AER_DRIVER prevents subsequent
@@ -70,7 +70,7 @@ static int report_error_detected(struct pci_dev *dev,
 			vote = PCI_ERS_RESULT_NONE;
 		}
 	} else {
-		err_handler = dev->driver->err_handler;
+		err_handler = pdrv->err_handler;
 		vote = err_handler->error_detected(dev, state);
 	}
 	pci_uevent_ers(dev, vote);
@@ -93,14 +93,15 @@ static int report_mmio_enabled(struct pci_dev *dev, void *data)
 {
 	pci_ers_result_t vote, *result = data;
 	const struct pci_error_handlers *err_handler;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 
 	device_lock(&dev->dev);
-	if (!dev->driver ||
-		!dev->driver->err_handler ||
-		!dev->driver->err_handler->mmio_enabled)
+	if (!pdrv ||
+		!pdrv->err_handler ||
+		!pdrv->err_handler->mmio_enabled)
 		goto out;
 
-	err_handler = dev->driver->err_handler;
+	err_handler = pdrv->err_handler;
 	vote = err_handler->mmio_enabled(dev);
 	*result = merge_result(*result, vote);
 out:
@@ -112,14 +113,15 @@ static int report_slot_reset(struct pci_dev *dev, void *data)
 {
 	pci_ers_result_t vote, *result = data;
 	const struct pci_error_handlers *err_handler;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 
 	device_lock(&dev->dev);
-	if (!dev->driver ||
-		!dev->driver->err_handler ||
-		!dev->driver->err_handler->slot_reset)
+	if (!pdrv ||
+		!pdrv->err_handler ||
+		!pdrv->err_handler->slot_reset)
 		goto out;
 
-	err_handler = dev->driver->err_handler;
+	err_handler = pdrv->err_handler;
 	vote = err_handler->slot_reset(dev);
 	*result = merge_result(*result, vote);
 out:
@@ -130,15 +132,16 @@ static int report_slot_reset(struct pci_dev *dev, void *data)
 static int report_resume(struct pci_dev *dev, void *data)
 {
 	const struct pci_error_handlers *err_handler;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 
 	device_lock(&dev->dev);
 	if (!pci_dev_set_io_state(dev, pci_channel_io_normal) ||
-		!dev->driver ||
-		!dev->driver->err_handler ||
-		!dev->driver->err_handler->resume)
+		!pdrv ||
+		!pdrv->err_handler ||
+		!pdrv->err_handler->resume)
 		goto out;
 
-	err_handler = dev->driver->err_handler;
+	err_handler = pdrv->err_handler;
 	err_handler->resume(dev);
 out:
 	pci_uevent_ers(dev, PCI_ERS_RESULT_RECOVERED);
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index b7a8f3a1921f..c80c57371dd8 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -599,12 +599,12 @@ static pci_ers_result_t pcifront_common_process(int cmd,
 	result = PCI_ERS_RESULT_NONE;
 
 	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
-	if (!pcidev || !pcidev->driver) {
+	pdrv = pci_driver_of_dev(pcidev);
+	if (!pcidev || !pdrv) {
 		dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
 		pci_dev_put(pcidev);
 		return result;
 	}
-	pdrv = pcidev->driver;
 
 	if (pdrv) {
 		if (pdrv->err_handler && pdrv->err_handler->error_detected) {
diff --git a/drivers/ssb/pcihost_wrapper.c b/drivers/ssb/pcihost_wrapper.c
index 410215c16920..229329b9e51c 100644
--- a/drivers/ssb/pcihost_wrapper.c
+++ b/drivers/ssb/pcihost_wrapper.c
@@ -68,6 +68,7 @@ static int ssb_pcihost_probe(struct pci_dev *dev,
 			     const struct pci_device_id *id)
 {
 	struct ssb_bus *ssb;
+	struct pci_driver *pdrv;
 	int err = -ENOMEM;
 	const char *name;
 	u32 val;
@@ -79,8 +80,10 @@ static int ssb_pcihost_probe(struct pci_dev *dev,
 	if (err)
 		goto err_kfree_ssb;
 	name = dev_name(&dev->dev);
-	if (dev->driver && dev->driver->name)
-		name = dev->driver->name;
+	
+	pdrv = pci_driver_of_dev(dev);
+	if (pdrv && pdrv->name)
+		name = pdrv->name;
 	err = pci_request_regions(dev, name);
 	if (err)
 		goto err_pci_disable;
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 18c2bbddf080..d8a6ef602a46 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -100,10 +100,11 @@ static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 {
 	struct pci_dev                  *pdev = to_pci_dev(dev);
+	struct pci_driver               *pdrv = pci_driver_of_dev(pdev);
 	struct xhci_driver_data         *driver_data;
 	const struct pci_device_id      *id;
 
-	id = pci_match_id(pdev->driver->id_table, pdev);
+	id = pci_match_id(pdrv->id_table, pdev);
 
 	if (id && id->driver_data) {
 		driver_data = (struct xhci_driver_data *)id->driver_data;
-- 
2.30.2

[PATCH v1 4/5] PCI: Adapt all code locations to not use struct pci_dev::driver directly

[Uwe Kleine-König]

This prepares removing the driver member of struct pci_dev which holds the
same information than struct pci_dev::dev->driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 arch/powerpc/include/asm/ppc-pci.h            |  3 +-
 arch/powerpc/kernel/eeh_driver.c              | 12 ++++---
 arch/x86/events/intel/uncore.c                |  2 +-
 arch/x86/kernel/probe_roms.c                  |  2 +-
 drivers/bcma/host_pci.c                       |  6 ++--
 drivers/crypto/hisilicon/qm.c                 |  2 +-
 drivers/crypto/qat/qat_common/adf_aer.c       |  2 +-
 drivers/message/fusion/mptbase.c              |  4 +--
 drivers/misc/cxl/guest.c                      | 21 +++++------
 drivers/misc/cxl/pci.c                        | 25 +++++++------
 .../ethernet/hisilicon/hns3/hns3_ethtool.c    |  3 +-
 .../ethernet/marvell/prestera/prestera_pci.c  |  2 +-
 drivers/net/ethernet/mellanox/mlxsw/pci.c     |  2 +-
 .../ethernet/netronome/nfp/nfp_net_ethtool.c  |  2 +-
 drivers/pci/iov.c                             | 23 +++++++-----
 drivers/pci/pci-driver.c                      | 28 ++++++++-------
 drivers/pci/pci.c                             | 10 +++---
 drivers/pci/pcie/err.c                        | 35 ++++++++++---------
 drivers/pci/xen-pcifront.c                    |  4 +--
 drivers/ssb/pcihost_wrapper.c                 |  7 ++--
 drivers/usb/host/xhci-pci.c                   |  3 +-
 21 files changed, 113 insertions(+), 85 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h
index 2b9edbf6e929..63938c156c57 100644
--- a/arch/powerpc/include/asm/ppc-pci.h
+++ b/arch/powerpc/include/asm/ppc-pci.h
@@ -57,7 +57,8 @@ void eeh_sysfs_remove_device(struct pci_dev *pdev);
 
 static inline const char *eeh_driver_name(struct pci_dev *pdev)
 {
-	return (pdev && pdev->driver) ? pdev->driver->name : "<null>";
+	struct pci_driver *pdrv;
+	return (pdev && (pdrv = pci_driver_of_dev(pdev))) ? pdrv->name : "<null>";
 }
 
 #endif /* CONFIG_EEH */
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index 3eff6a4888e7..0fc712a8775e 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -104,13 +104,14 @@ static bool eeh_edev_actionable(struct eeh_dev *edev)
  */
 static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev)
 {
-	if (!pdev || !pdev->driver)
+	struct pci_driver *pdrv;
+	if (!pdev || !(pdrv = pci_driver_of_dev(pdev)))
 		return NULL;
 
-	if (!try_module_get(pdev->driver->driver.owner))
+	if (!try_module_get(pdrv->driver.owner))
 		return NULL;
 
-	return pdev->driver;
+	return pdrv;
 }
 
 /**
@@ -122,10 +123,11 @@ static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev)
  */
 static inline void eeh_pcid_put(struct pci_dev *pdev)
 {
-	if (!pdev || !pdev->driver)
+	struct pci_driver *pdrv;
+	if (!pdev || !(pdrv = pci_driver_of_dev(pdev)))
 		return;
 
-	module_put(pdev->driver->driver.owner);
+	module_put(pdrv->driver.owner);
 }
 
 /**
diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 9bf4dbbc26e2..14eb141b6cf2 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -1176,7 +1176,7 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id
 	 * PCI slot and func to indicate the uncore box.
 	 */
 	if (id->driver_data & ~0xffff) {
-		struct pci_driver *pci_drv = pdev->driver;
+		struct pci_driver *pci_drv = pci_driver_of_dev(pdev);
 
 		pmu = uncore_pci_find_dev_pmu(pdev, pci_drv->id_table);
 		if (pmu == NULL)
diff --git a/arch/x86/kernel/probe_roms.c b/arch/x86/kernel/probe_roms.c
index 9e1def3744f2..55bfafec9684 100644
--- a/arch/x86/kernel/probe_roms.c
+++ b/arch/x86/kernel/probe_roms.c
@@ -80,7 +80,7 @@ static struct resource video_rom_resource = {
  */
 static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short device)
 {
-	struct pci_driver *drv = pdev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pdev);
 	const struct pci_device_id *id;
 
 	if (pdev->vendor == vendor && pdev->device == device)
diff --git a/drivers/bcma/host_pci.c b/drivers/bcma/host_pci.c
index 69c10a7b7c61..f9bfae87ebd9 100644
--- a/drivers/bcma/host_pci.c
+++ b/drivers/bcma/host_pci.c
@@ -161,6 +161,7 @@ static int bcma_host_pci_probe(struct pci_dev *dev,
 			       const struct pci_device_id *id)
 {
 	struct bcma_bus *bus;
+	struct pci_driver *pdrv;
 	int err = -ENOMEM;
 	const char *name;
 	u32 val;
@@ -176,8 +177,9 @@ static int bcma_host_pci_probe(struct pci_dev *dev,
 		goto err_kfree_bus;
 
 	name = dev_name(&dev->dev);
-	if (dev->driver && dev->driver->name)
-		name = dev->driver->name;
+	pdrv = pci_driver_of_dev(dev);
+	if (pdrv && pdrv->name)
+		name = pdrv->name;
 	err = pci_request_regions(dev, name);
 	if (err)
 		goto err_pci_disable;
diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 1d67f94a1d56..303cc546f466 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -3003,7 +3003,7 @@ static int qm_alloc_uacce(struct hisi_qm *qm)
 	};
 	int ret;
 
-	ret = strscpy(interface.name, pdev->driver->name,
+	ret = strscpy(interface.name, pci_driver_of_dev(pdev)->name,
 		      sizeof(interface.name));
 	if (ret < 0)
 		return -ENAMETOOLONG;
diff --git a/drivers/crypto/qat/qat_common/adf_aer.c b/drivers/crypto/qat/qat_common/adf_aer.c
index d2ae293d0df6..162c2b9ef93d 100644
--- a/drivers/crypto/qat/qat_common/adf_aer.c
+++ b/drivers/crypto/qat/qat_common/adf_aer.c
@@ -185,7 +185,7 @@ static const struct pci_error_handlers adf_err_handler = {
 int adf_enable_aer(struct adf_accel_dev *accel_dev)
 {
 	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
-	struct pci_driver *pdrv = pdev->driver;
+	struct pci_driver *pdrv = pci_driver_of_dev(pdev);
 
 	pdrv->err_handler = &adf_err_handler;
 	pci_enable_pcie_error_reporting(pdev);
diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 7f7abc9069f7..181e2927a719 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -838,8 +838,8 @@ mpt_device_driver_register(struct mpt_pci_driver * dd_cbfunc, u8 cb_idx)
 
 	/* call per pci device probe entry point */
 	list_for_each_entry(ioc, &ioc_list, list) {
-		id = ioc->pcidev->driver ?
-		    ioc->pcidev->driver->id_table : NULL;
+		struct pci_driver *pdrv = pci_driver_of_dev(ioc->pcidev);
+		id = pdrv ?  pdrv->id_table : NULL;
 		if (dd_cbfunc->probe)
 			dd_cbfunc->probe(ioc->pcidev, id);
 	 }
diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index 186308f1f8eb..99b969b182b5 100644
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -25,28 +25,29 @@ static void pci_error_handlers(struct cxl_afu *afu,
 		return;
 
 	list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
-		if (!afu_dev->driver)
+		struct pci_driver *afu_drv = pci_driver_of_dev(afu_dev);
+		if (!afu_drv)
 			continue;
 
 		switch (bus_error_event) {
 		case CXL_ERROR_DETECTED_EVENT:
 			afu_dev->error_state = state;
 
-			if (afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->error_detected)
-				afu_dev->driver->err_handler->error_detected(afu_dev, state);
+			if (afu_drv->err_handler &&
+			    afu_drv->err_handler->error_detected)
+				afu_drv->err_handler->error_detected(afu_dev, state);
 		break;
 		case CXL_SLOT_RESET_EVENT:
 			afu_dev->error_state = state;
 
-			if (afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->slot_reset)
-				afu_dev->driver->err_handler->slot_reset(afu_dev);
+			if (afu_drv->err_handler &&
+			    afu_drv->err_handler->slot_reset)
+				afu_drv->err_handler->slot_reset(afu_dev);
 		break;
 		case CXL_RESUME_EVENT:
-			if (afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->resume)
-				afu_dev->driver->err_handler->resume(afu_dev);
+			if (afu_drv->err_handler &&
+			    afu_drv->err_handler->resume)
+				afu_drv->err_handler->resume(afu_dev);
 		break;
 		}
 	}
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 2ba899f5659f..1cf39275029f 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -1805,13 +1805,14 @@ static pci_ers_result_t cxl_vphb_error_detected(struct cxl_afu *afu,
 		return result;
 
 	list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
-		if (!afu_dev->driver)
+		struct pci_driver *afu_drv = pci_driver_of_dev(afu_dev);
+		if (!afu_drv)
 			continue;
 
 		afu_dev->error_state = state;
 
-		if (afu_dev->driver->err_handler)
-			afu_result = afu_dev->driver->err_handler->error_detected(afu_dev,
+		if (afu_drv->err_handler)
+			afu_result = afu_drv->err_handler->error_detected(afu_dev,
 										  state);
 		/* Disconnect trumps all, NONE trumps NEED_RESET */
 		if (afu_result == PCI_ERS_RESULT_DISCONNECT)
@@ -2003,6 +2004,8 @@ static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev)
 			continue;
 
 		list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
+			struct pci_driver *afu_drv;
+
 			/* Reset the device context.
 			 * TODO: make this less disruptive
 			 */
@@ -2028,12 +2031,13 @@ static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev)
 			 * shouldn't start new work until we call
 			 * their resume function.
 			 */
-			if (!afu_dev->driver)
+			afu_drv = pci_driver_of_dev(afu_dev);
+			if (!afu_drv)
 				continue;
 
-			if (afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->slot_reset)
-				afu_result = afu_dev->driver->err_handler->slot_reset(afu_dev);
+			if (afu_drv->err_handler &&
+			    afu_drv->err_handler->slot_reset)
+				afu_result = afu_drv->err_handler->slot_reset(afu_dev);
 
 			if (afu_result == PCI_ERS_RESULT_DISCONNECT)
 				result = PCI_ERS_RESULT_DISCONNECT;
@@ -2074,9 +2078,10 @@ static void cxl_pci_resume(struct pci_dev *pdev)
 			continue;
 
 		list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
-			if (afu_dev->driver && afu_dev->driver->err_handler &&
-			    afu_dev->driver->err_handler->resume)
-				afu_dev->driver->err_handler->resume(afu_dev);
+			struct pci_driver *afu_drv = pci_driver_of_dev(afu_dev);
+			if (afu_drv && afu_drv->err_handler &&
+			    afu_drv->err_handler->resume)
+				afu_drv->err_handler->resume(afu_dev);
 		}
 	}
 	spin_unlock(&adapter->afu_list_lock);
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index 82061ab6930f..833d35e9ed4a 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -593,8 +593,7 @@ static void hns3_get_drvinfo(struct net_device *netdev,
 		return;
 	}
 
-	strncpy(drvinfo->driver, h->pdev->driver->name,
-		sizeof(drvinfo->driver));
+	strncpy(drvinfo->driver, pci_driver_of_dev(h->pdev)->name, sizeof(drvinfo->driver));
 	drvinfo->driver[sizeof(drvinfo->driver) - 1] = '\0';
 
 	strncpy(drvinfo->bus_info, pci_name(h->pdev),
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_pci.c b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
index a250d394da38..180999c2165e 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_pci.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_pci.c
@@ -720,7 +720,7 @@ static int prestera_fw_load(struct prestera_fw *fw)
 static int prestera_pci_probe(struct pci_dev *pdev,
 			      const struct pci_device_id *id)
 {
-	const char *driver_name = pdev->driver->name;
+	const char *driver_name = pci_driver_of_dev(pdev)->name;
 	struct prestera_fw *fw;
 	int err;
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/pci.c b/drivers/net/ethernet/mellanox/mlxsw/pci.c
index 13b0259f7ea6..d3c1ca840fa7 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/pci.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/pci.c
@@ -1876,7 +1876,7 @@ static void mlxsw_pci_cmd_fini(struct mlxsw_pci *mlxsw_pci)
 
 static int mlxsw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
-	const char *driver_name = pdev->driver->name;
+	const char *driver_name = pci_driver_of_dev(pdev)->name;
 	struct mlxsw_pci *mlxsw_pci;
 	int err;
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
index 1b482446536d..5c25f6af3f62 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -202,7 +202,7 @@ nfp_get_drvinfo(struct nfp_app *app, struct pci_dev *pdev,
 {
 	char nsp_version[ETHTOOL_FWVERS_LEN] = {};
 
-	strlcpy(drvinfo->driver, pdev->driver->name, sizeof(drvinfo->driver));
+	strlcpy(drvinfo->driver, pci_driver_of_dev(pdev)->name, sizeof(drvinfo->driver));
 	nfp_net_get_nspinfo(app, nsp_version);
 	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
 		 "%s %s %s %s", vnic_version, nsp_version,
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index dafdc652fcd0..7c6f0c466df8 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -164,13 +164,14 @@ static ssize_t sriov_vf_total_msix_show(struct device *dev,
 					char *buf)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pci_driver *pdrv = pci_driver_of_dev(pdev);
 	u32 vf_total_msix = 0;
 
 	device_lock(dev);
-	if (!pdev->driver || !pdev->driver->sriov_get_vf_total_msix)
+	if (!pdrv || !pdrv->sriov_get_vf_total_msix)
 		goto unlock;
 
-	vf_total_msix = pdev->driver->sriov_get_vf_total_msix(pdev);
+	vf_total_msix = pdrv->sriov_get_vf_total_msix(pdev);
 unlock:
 	device_unlock(dev);
 	return sysfs_emit(buf, "%u\n", vf_total_msix);
@@ -183,6 +184,7 @@ static ssize_t sriov_vf_msix_count_store(struct device *dev,
 {
 	struct pci_dev *vf_dev = to_pci_dev(dev);
 	struct pci_dev *pdev = pci_physfn(vf_dev);
+	struct pci_driver *pdrv;
 	int val, ret;
 
 	ret = kstrtoint(buf, 0, &val);
@@ -193,13 +195,14 @@ static ssize_t sriov_vf_msix_count_store(struct device *dev,
 		return -EINVAL;
 
 	device_lock(&pdev->dev);
-	if (!pdev->driver || !pdev->driver->sriov_set_msix_vec_count) {
+	pdrv = pci_driver_of_dev(pdev);
+	if (!pdrv || !pdrv->sriov_set_msix_vec_count) {
 		ret = -EOPNOTSUPP;
 		goto err_pdev;
 	}
 
 	device_lock(&vf_dev->dev);
-	if (vf_dev->driver) {
+	if (pci_driver_of_dev(vf_dev)) {
 		/*
 		 * A driver is already attached to this VF and has configured
 		 * itself based on the current MSI-X vector count. Changing
@@ -209,7 +212,7 @@ static ssize_t sriov_vf_msix_count_store(struct device *dev,
 		goto err_dev;
 	}
 
-	ret = pdev->driver->sriov_set_msix_vec_count(vf_dev, val);
+	ret = pdrv->sriov_set_msix_vec_count(vf_dev, val);
 
 err_dev:
 	device_unlock(&vf_dev->dev);
@@ -376,6 +379,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 				  const char *buf, size_t count)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pci_driver *pdrv;
 	int ret;
 	u16 num_vfs;
 
@@ -392,14 +396,15 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 		goto exit;
 
 	/* is PF driver loaded */
-	if (!pdev->driver) {
+	pdrv = pci_driver_of_dev(pdev);
+	if (!pdrv) {
 		pci_info(pdev, "no driver bound to device; cannot configure SR-IOV\n");
 		ret = -ENOENT;
 		goto exit;
 	}
 
 	/* is PF driver loaded w/callback */
-	if (!pdev->driver->sriov_configure) {
+	if (!pdrv->sriov_configure) {
 		pci_info(pdev, "driver does not support SR-IOV configuration via sysfs\n");
 		ret = -ENOENT;
 		goto exit;
@@ -407,7 +412,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 
 	if (num_vfs == 0) {
 		/* disable VFs */
-		ret = pdev->driver->sriov_configure(pdev, 0);
+		ret = pdrv->sriov_configure(pdev, 0);
 		goto exit;
 	}
 
@@ -419,7 +424,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 		goto exit;
 	}
 
-	ret = pdev->driver->sriov_configure(pdev, num_vfs);
+	ret = pdrv->sriov_configure(pdev, num_vfs);
 	if (ret < 0)
 		goto exit;
 
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 7dff574bb2fa..740d5bf5d411 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -443,7 +443,7 @@ static int pci_device_probe(struct device *dev)
 static int pci_device_remove(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 
 	if (drv->remove) {
 		pm_runtime_get_sync(dev);
@@ -480,7 +480,7 @@ static int pci_device_remove(struct device *dev)
 static void pci_device_shutdown(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 
 	pm_runtime_resume(dev);
 
@@ -576,7 +576,7 @@ static int pci_pm_reenable_device(struct pci_dev *pci_dev)
 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 
 	if (drv && drv->suspend) {
 		pci_power_t prev = pci_dev->current_state;
@@ -617,7 +617,7 @@ static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
 static int pci_legacy_resume(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 
 	pci_fixup_device(pci_fixup_resume, pci_dev);
 
@@ -636,7 +636,7 @@ static void pci_pm_default_suspend(struct pci_dev *pci_dev)
 
 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
 {
-	struct pci_driver *drv = pci_dev->driver;
+	struct pci_driver *drv = pci_driver_of_dev(pci_dev);
 	bool ret = drv && (drv->suspend || drv->resume);
 
 	/*
@@ -1224,16 +1224,17 @@ static int pci_pm_restore(struct device *dev)
 static int pci_pm_runtime_suspend(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct pci_driver *pdrv = pci_driver_of_dev(pci_dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	pci_power_t prev = pci_dev->current_state;
 	int error;
 
 	/*
-	 * If pci_dev->driver is not set (unbound), we leave the device in D0,
+	 * If pdrv is not set (unbound), we leave the device in D0,
 	 * but it may go to D3cold when the bridge above it runtime suspends.
 	 * Save its config space in case that happens.
 	 */
-	if (!pci_dev->driver) {
+	if (!pdrv) {
 		pci_save_state(pci_dev);
 		return 0;
 	}
@@ -1279,6 +1280,7 @@ static int pci_pm_runtime_suspend(struct device *dev)
 static int pci_pm_runtime_resume(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct pci_driver *pdrv = pci_driver_of_dev(pci_dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	pci_power_t prev_state = pci_dev->current_state;
 	int error = 0;
@@ -1290,7 +1292,7 @@ static int pci_pm_runtime_resume(struct device *dev)
 	 */
 	pci_restore_standard_config(pci_dev);
 
-	if (!pci_dev->driver)
+	if (!pdrv)
 		return 0;
 
 	pci_fixup_device(pci_fixup_resume_early, pci_dev);
@@ -1310,13 +1312,14 @@ static int pci_pm_runtime_resume(struct device *dev)
 static int pci_pm_runtime_idle(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct pci_driver *pdrv = pci_driver_of_dev(pci_dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
 	/*
-	 * If pci_dev->driver is not set (unbound), the device should
+	 * If pdrv is not set (unbound), the device should
 	 * always remain in D0 regardless of the runtime PM status
 	 */
-	if (!pci_dev->driver)
+	if (!pdrv)
 		return 0;
 
 	if (!pm)
@@ -1423,8 +1426,9 @@ static struct pci_driver pci_compat_driver = {
  */
 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
 {
-	if (dev->driver)
-		return dev->driver;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
+	if (pdrv)
+		return pdrv;
 	else {
 		int i;
 		for (i = 0; i <= PCI_ROM_RESOURCE; i++)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index aacf575c15cf..9565f6c1bd4f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5069,11 +5069,12 @@ EXPORT_SYMBOL_GPL(pci_dev_unlock);
 
 static void pci_dev_save_and_disable(struct pci_dev *dev)
 {
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 	const struct pci_error_handlers *err_handler =
-			dev->driver ? dev->driver->err_handler : NULL;
+			pdrv ? pdrv->err_handler : NULL;
 
 	/*
-	 * dev->driver->err_handler->reset_prepare() is protected against
+	 * pdrv->err_handler->reset_prepare() is protected against
 	 * races with ->remove() by the device lock, which must be held by
 	 * the caller.
 	 */
@@ -5100,13 +5101,14 @@ static void pci_dev_save_and_disable(struct pci_dev *dev)
 
 static void pci_dev_restore(struct pci_dev *dev)
 {
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 	const struct pci_error_handlers *err_handler =
-			dev->driver ? dev->driver->err_handler : NULL;
+			pdrv ? pdrv->err_handler : NULL;
 
 	pci_restore_state(dev);
 
 	/*
-	 * dev->driver->err_handler->reset_done() is protected against
+	 * err_handler->reset_done() is protected against
 	 * races with ->remove() by the device lock, which must be held by
 	 * the caller.
 	 */
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index b576aa890c76..5b2b7b2972dd 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -51,12 +51,12 @@ static int report_error_detected(struct pci_dev *dev,
 {
 	pci_ers_result_t vote;
 	const struct pci_error_handlers *err_handler;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 
 	device_lock(&dev->dev);
 	if (!pci_dev_set_io_state(dev, state) ||
-		!dev->driver ||
-		!dev->driver->err_handler ||
-		!dev->driver->err_handler->error_detected) {
+		!pdrv || !pdrv->err_handler ||
+		!pdrv->err_handler->error_detected) {
 		/*
 		 * If any device in the subtree does not have an error_detected
 		 * callback, PCI_ERS_RESULT_NO_AER_DRIVER prevents subsequent
@@ -70,7 +70,7 @@ static int report_error_detected(struct pci_dev *dev,
 			vote = PCI_ERS_RESULT_NONE;
 		}
 	} else {
-		err_handler = dev->driver->err_handler;
+		err_handler = pdrv->err_handler;
 		vote = err_handler->error_detected(dev, state);
 	}
 	pci_uevent_ers(dev, vote);
@@ -93,14 +93,15 @@ static int report_mmio_enabled(struct pci_dev *dev, void *data)
 {
 	pci_ers_result_t vote, *result = data;
 	const struct pci_error_handlers *err_handler;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 
 	device_lock(&dev->dev);
-	if (!dev->driver ||
-		!dev->driver->err_handler ||
-		!dev->driver->err_handler->mmio_enabled)
+	if (!pdrv ||
+		!pdrv->err_handler ||
+		!pdrv->err_handler->mmio_enabled)
 		goto out;
 
-	err_handler = dev->driver->err_handler;
+	err_handler = pdrv->err_handler;
 	vote = err_handler->mmio_enabled(dev);
 	*result = merge_result(*result, vote);
 out:
@@ -112,14 +113,15 @@ static int report_slot_reset(struct pci_dev *dev, void *data)
 {
 	pci_ers_result_t vote, *result = data;
 	const struct pci_error_handlers *err_handler;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 
 	device_lock(&dev->dev);
-	if (!dev->driver ||
-		!dev->driver->err_handler ||
-		!dev->driver->err_handler->slot_reset)
+	if (!pdrv ||
+		!pdrv->err_handler ||
+		!pdrv->err_handler->slot_reset)
 		goto out;
 
-	err_handler = dev->driver->err_handler;
+	err_handler = pdrv->err_handler;
 	vote = err_handler->slot_reset(dev);
 	*result = merge_result(*result, vote);
 out:
@@ -130,15 +132,16 @@ static int report_slot_reset(struct pci_dev *dev, void *data)
 static int report_resume(struct pci_dev *dev, void *data)
 {
 	const struct pci_error_handlers *err_handler;
+	struct pci_driver *pdrv = pci_driver_of_dev(dev);
 
 	device_lock(&dev->dev);
 	if (!pci_dev_set_io_state(dev, pci_channel_io_normal) ||
-		!dev->driver ||
-		!dev->driver->err_handler ||
-		!dev->driver->err_handler->resume)
+		!pdrv ||
+		!pdrv->err_handler ||
+		!pdrv->err_handler->resume)
 		goto out;
 
-	err_handler = dev->driver->err_handler;
+	err_handler = pdrv->err_handler;
 	err_handler->resume(dev);
 out:
 	pci_uevent_ers(dev, PCI_ERS_RESULT_RECOVERED);
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index b7a8f3a1921f..c80c57371dd8 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -599,12 +599,12 @@ static pci_ers_result_t pcifront_common_process(int cmd,
 	result = PCI_ERS_RESULT_NONE;
 
 	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
-	if (!pcidev || !pcidev->driver) {
+	pdrv = pci_driver_of_dev(pcidev);
+	if (!pcidev || !pdrv) {
 		dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
 		pci_dev_put(pcidev);
 		return result;
 	}
-	pdrv = pcidev->driver;
 
 	if (pdrv) {
 		if (pdrv->err_handler && pdrv->err_handler->error_detected) {
diff --git a/drivers/ssb/pcihost_wrapper.c b/drivers/ssb/pcihost_wrapper.c
index 410215c16920..229329b9e51c 100644
--- a/drivers/ssb/pcihost_wrapper.c
+++ b/drivers/ssb/pcihost_wrapper.c
@@ -68,6 +68,7 @@ static int ssb_pcihost_probe(struct pci_dev *dev,
 			     const struct pci_device_id *id)
 {
 	struct ssb_bus *ssb;
+	struct pci_driver *pdrv;
 	int err = -ENOMEM;
 	const char *name;
 	u32 val;
@@ -79,8 +80,10 @@ static int ssb_pcihost_probe(struct pci_dev *dev,
 	if (err)
 		goto err_kfree_ssb;
 	name = dev_name(&dev->dev);
-	if (dev->driver && dev->driver->name)
-		name = dev->driver->name;
+	
+	pdrv = pci_driver_of_dev(dev);
+	if (pdrv && pdrv->name)
+		name = pdrv->name;
 	err = pci_request_regions(dev, name);
 	if (err)
 		goto err_pci_disable;
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 18c2bbddf080..d8a6ef602a46 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -100,10 +100,11 @@ static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 {
 	struct pci_dev                  *pdev = to_pci_dev(dev);
+	struct pci_driver               *pdrv = pci_driver_of_dev(pdev);
 	struct xhci_driver_data         *driver_data;
 	const struct pci_device_id      *id;
 
-	id = pci_match_id(pdev->driver->id_table, pdev);
+	id = pci_match_id(pdrv->id_table, pdev);
 
 	if (id && id->driver_data) {
 		driver_data = (struct xhci_driver_data *)id->driver_data;
-- 
2.30.2

[PATCH v1 5/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Uwe Kleine-König]

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pci/pci-driver.c | 4 ----
 include/linux/pci.h      | 3 +--
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 740d5bf5d411..5d950eb476e2 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -305,12 +305,10 @@ static long local_pci_probe(void *_ddi)
 	 * its remove routine.
 	 */
 	pm_runtime_get_sync(dev);
-	pci_dev->driver = pci_drv;
 	rc = pci_drv->probe(pci_dev, ddi->id);
 	if (!rc)
 		return rc;
 	if (rc < 0) {
-		pci_dev->driver = NULL;
 		pm_runtime_put_sync(dev);
 		return rc;
 	}
@@ -376,7 +374,6 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
  * @pci_dev: PCI device being probed
  *
  * returns 0 on success, else error.
- * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
  */
 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
 {
@@ -451,7 +448,6 @@ static int pci_device_remove(struct device *dev)
 		pm_runtime_put_noidle(dev);
 	}
 	pcibios_free_irq(pci_dev);
-	pci_dev->driver = NULL;
 	pci_iov_remove(pci_dev);
 
 	/* Undo the runtime PM settings in local_pci_probe() */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 778f3b5e6f23..f44ab76e216f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -342,7 +342,6 @@ struct pci_dev {
 	u16		pcie_flags_reg;	/* Cached PCIe Capabilities Register */
 	unsigned long	*dma_alias_mask;/* Mask of enabled devfn aliases */
 
-	struct pci_driver *driver;	/* Driver bound to this device */
 	u64		dma_mask;	/* Mask of the bits of bus address this
 					   device implements.  Normally this is
 					   0xffffffff.  You only need to change
@@ -887,7 +886,7 @@ struct pci_driver {
 };
 
 #define	to_pci_driver(drv) container_of(drv, struct pci_driver, driver)
-#define pci_driver_of_dev(pdev) ((pdev)->driver)
+#define pci_driver_of_dev(pdev) ((pdev)->dev.driver ? to_pci_driver((pdev)->dev.driver) : NULL)
 
 /**
  * PCI_DEVICE - macro used to describe a specific PCI device
-- 
2.30.2

Re: [PATCH v1 5/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Greg Kroah-Hartman]

On Thu, Jul 29, 2021 at 10:37:40PM +0200, Uwe Kleine-König wrote:
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

I know I can not take patches without any changelog text, maybe other
maintainers are more lax :(

Re: [PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Greg Kroah-Hartman]

On Thu, Jul 29, 2021 at 10:37:35PM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> struct pci_dev tracks the bound pci driver twice. This series is about
> removing this duplication.
> 
> The first two patches are just cleanups. The third patch introduces a
> wrapper that abstracts access to struct pci_dev->driver. In the next
> patch (hopefully) all users are converted to use the new wrapper and
> finally the fifth patch removes the duplication.
> 
> Note this series is only build tested (allmodconfig on several
> architectures).
> 
> I'm open to restructure this series if this simplifies things. E.g. the
> use of the new wrapper in drivers/pci could be squashed into the patch
> introducing the wrapper. Patch 4 could be split by maintainer tree or
> squashed into patch 3 completely.
> 
> Best regards
> Uwe
> 
> Uwe Kleine-König (5):
>   PCI: Simplify pci_device_remove()
>   PCI: Drop useless check from pci_device_probe()
>   PCI: Provide wrapper to access a pci_dev's bound driver
>   PCI: Adapt all code locations to not use struct pci_dev::driver
>     directly
>   PCI: Drop duplicated tracking of a pci_dev's bound driver

Other than my objection to patch 5/5 lack of changelog, looks sane to
me:

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Greg Kroah-Hartman]

On Thu, Jul 29, 2021 at 10:37:35PM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> struct pci_dev tracks the bound pci driver twice. This series is about
> removing this duplication.
> 
> The first two patches are just cleanups. The third patch introduces a
> wrapper that abstracts access to struct pci_dev->driver. In the next
> patch (hopefully) all users are converted to use the new wrapper and
> finally the fifth patch removes the duplication.
> 
> Note this series is only build tested (allmodconfig on several
> architectures).
> 
> I'm open to restructure this series if this simplifies things. E.g. the
> use of the new wrapper in drivers/pci could be squashed into the patch
> introducing the wrapper. Patch 4 could be split by maintainer tree or
> squashed into patch 3 completely.
> 
> Best regards
> Uwe
> 
> Uwe Kleine-König (5):
>   PCI: Simplify pci_device_remove()
>   PCI: Drop useless check from pci_device_probe()
>   PCI: Provide wrapper to access a pci_dev's bound driver
>   PCI: Adapt all code locations to not use struct pci_dev::driver
>     directly
>   PCI: Drop duplicated tracking of a pci_dev's bound driver

Other than my objection to patch 5/5 lack of changelog, looks sane to
me:

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Re: [PATCH v1 5/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 1041 bytes --]

On Fri, Jul 30, 2021 at 07:14:27AM +0200, Greg Kroah-Hartman wrote:
> On Thu, Jul 29, 2021 at 10:37:40PM +0200, Uwe Kleine-König wrote:
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> 
> I know I can not take patches without any changelog text, maybe other
> maintainers are more lax :(

Ah right, I admit to not invest much car here, mainly because I
didn't expect that this patch makes it in very soon as there are many
maintainers involved in the patches this one depends on.

I'd write something like:

Currently it's tracked twice which driver is bound to a given pci
device. Now that all users of the pci specific one (struct
pci_dev::driver) are updated to use an access macro
(pci_driver_of_dev()), change the macro to use the information from the
driver core and remove the driver member from struct pci_dev.

Best regards
Uwe


-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Andy Shevchenko]

On Thu, Jul 29, 2021 at 10:37:35PM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> struct pci_dev tracks the bound pci driver twice. This series is about
> removing this duplication.
> 
> The first two patches are just cleanups. The third patch introduces a
> wrapper that abstracts access to struct pci_dev->driver. In the next
> patch (hopefully) all users are converted to use the new wrapper and
> finally the fifth patch removes the duplication.
> 
> Note this series is only build tested (allmodconfig on several
> architectures).
> 
> I'm open to restructure this series if this simplifies things. E.g. the
> use of the new wrapper in drivers/pci could be squashed into the patch
> introducing the wrapper. Patch 4 could be split by maintainer tree or
> squashed into patch 3 completely.

I see only patch 4 and this cover letter...

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Andy Shevchenko]

On Thu, Jul 29, 2021 at 10:37:35PM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> struct pci_dev tracks the bound pci driver twice. This series is about
> removing this duplication.
> 
> The first two patches are just cleanups. The third patch introduces a
> wrapper that abstracts access to struct pci_dev->driver. In the next
> patch (hopefully) all users are converted to use the new wrapper and
> finally the fifth patch removes the duplication.
> 
> Note this series is only build tested (allmodconfig on several
> architectures).
> 
> I'm open to restructure this series if this simplifies things. E.g. the
> use of the new wrapper in drivers/pci could be squashed into the patch
> introducing the wrapper. Patch 4 could be split by maintainer tree or
> squashed into patch 3 completely.

I see only patch 4 and this cover letter...

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 1952 bytes --]

Hi Andy,

On Fri, Jul 30, 2021 at 11:06:20AM +0300, Andy Shevchenko wrote:
> On Thu, Jul 29, 2021 at 10:37:35PM +0200, Uwe Kleine-König wrote:
> > struct pci_dev tracks the bound pci driver twice. This series is about
> > removing this duplication.
> > 
> > The first two patches are just cleanups. The third patch introduces a
> > wrapper that abstracts access to struct pci_dev->driver. In the next
> > patch (hopefully) all users are converted to use the new wrapper and
> > finally the fifth patch removes the duplication.
> > 
> > Note this series is only build tested (allmodconfig on several
> > architectures).
> > 
> > I'm open to restructure this series if this simplifies things. E.g. the
> > use of the new wrapper in drivers/pci could be squashed into the patch
> > introducing the wrapper. Patch 4 could be split by maintainer tree or
> > squashed into patch 3 completely.
> 
> I see only patch 4 and this cover letter...

The full series is available at

	https://lore.kernel.org/linux-pci/20210729203740.1377045-1-u.kleine-koenig@pengutronix.de/

All patches but #4 only touch drivers/pci/ (and include/linux/pci.h) and
it seemed excessive to me to send all patches to all people. It seems at
least for you I balanced this wrongly. The short version is that patch
#3 introduces

	+#define pci_driver_of_dev(pdev) ((pdev)->driver)

which allows to do the stuff done in patch #4 and then patch #5 does

	-#define pci_driver_of_dev(pdev) ((pdev)->driver)
	+#define pci_driver_of_dev(pdev) ((pdev)->dev.driver ? to_pci_driver((pdev)->dev.driver) : NULL)

plus some cleanups.

If you want I can send you a bounce (or you try

	b4 am 20210729203740.1377045-1-u.kleine-koenig@pengutronix.de

).

Best regards and thanks for caring,
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [PATCH v1 0/5] PCI: Drop duplicated tracking of a pci_dev's bound driver

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 1952 bytes --]

Hi Andy,

On Fri, Jul 30, 2021 at 11:06:20AM +0300, Andy Shevchenko wrote:
> On Thu, Jul 29, 2021 at 10:37:35PM +0200, Uwe Kleine-König wrote:
> > struct pci_dev tracks the bound pci driver twice. This series is about
> > removing this duplication.
> > 
> > The first two patches are just cleanups. The third patch introduces a
> > wrapper that abstracts access to struct pci_dev->driver. In the next
> > patch (hopefully) all users are converted to use the new wrapper and
> > finally the fifth patch removes the duplication.
> > 
> > Note this series is only build tested (allmodconfig on several
> > architectures).
> > 
> > I'm open to restructure this series if this simplifies things. E.g. the
> > use of the new wrapper in drivers/pci could be squashed into the patch
> > introducing the wrapper. Patch 4 could be split by maintainer tree or
> > squashed into patch 3 completely.
> 
> I see only patch 4 and this cover letter...

The full series is available at

	https://lore.kernel.org/linux-pci/20210729203740.1377045-1-u.kleine-koenig@pengutronix.de/

All patches but #4 only touch drivers/pci/ (and include/linux/pci.h) and
it seemed excessive to me to send all patches to all people. It seems at
least for you I balanced this wrongly. The short version is that patch
#3 introduces

	+#define pci_driver_of_dev(pdev) ((pdev)->driver)

which allows to do the stuff done in patch #4 and then patch #5 does

	-#define pci_driver_of_dev(pdev) ((pdev)->driver)
	+#define pci_driver_of_dev(pdev) ((pdev)->dev.driver ? to_pci_driver((pdev)->dev.driver) : NULL)

plus some cleanups.

If you want I can send you a bounce (or you try

	b4 am 20210729203740.1377045-1-u.kleine-koenig@pengutronix.de

).

Best regards and thanks for caring,
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [PATCH v1 4/5] PCI: Adapt all code locations to not use struct pci_dev::driver directly

[Boris Ostrovsky]

On 7/29/21 4:37 PM, Uwe Kleine-König wrote:

> --- a/drivers/pci/xen-pcifront.c
> +++ b/drivers/pci/xen-pcifront.c
> @@ -599,12 +599,12 @@ static pci_ers_result_t pcifront_common_process(int cmd,
>  	result = PCI_ERS_RESULT_NONE;
>  
>  	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
> -	if (!pcidev || !pcidev->driver) {
> +	pdrv = pci_driver_of_dev(pcidev);
> +	if (!pcidev || !pdrv) {


If pcidev is NULL we are dead by the time we reach 'if' statement.


-boris



>  		dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
>  		pci_dev_put(pcidev);
>  		return result;
>  	}
> -	pdrv = pcidev->driver;
>  

Re: [PATCH v1 4/5] PCI: Adapt all code locations to not use struct pci_dev::driver directly

[Boris Ostrovsky]

On 7/29/21 4:37 PM, Uwe Kleine-König wrote:

> --- a/drivers/pci/xen-pcifront.c
> +++ b/drivers/pci/xen-pcifront.c
> @@ -599,12 +599,12 @@ static pci_ers_result_t pcifront_common_process(int cmd,
>  	result = PCI_ERS_RESULT_NONE;
>  
>  	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
> -	if (!pcidev || !pcidev->driver) {
> +	pdrv = pci_driver_of_dev(pcidev);
> +	if (!pcidev || !pdrv) {


If pcidev is NULL we are dead by the time we reach 'if' statement.


-boris



>  		dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
>  		pci_dev_put(pcidev);
>  		return result;
>  	}
> -	pdrv = pcidev->driver;
>  

Re: [PATCH v1 4/5] PCI: Adapt all code locations to not use struct pci_dev::driver directly

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 1063 bytes --]

Hello Boris,

On Fri, Jul 30, 2021 at 04:37:31PM -0400, Boris Ostrovsky wrote:
> On 7/29/21 4:37 PM, Uwe Kleine-König wrote:
> > --- a/drivers/pci/xen-pcifront.c
> > +++ b/drivers/pci/xen-pcifront.c
> > @@ -599,12 +599,12 @@ static pci_ers_result_t pcifront_common_process(int cmd,
> >  	result = PCI_ERS_RESULT_NONE;
> >  
> >  	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
> > -	if (!pcidev || !pcidev->driver) {
> > +	pdrv = pci_driver_of_dev(pcidev);
> > +	if (!pcidev || !pdrv) {
> 
> If pcidev is NULL we are dead by the time we reach 'if' statement.

Oh, you're right. So this needs something like:

	if (!pcidev || !(pdrv = pci_driver_of_dev(pcidev)))

or repeating the call to pci_driver_of_dev for each previous usage of
pdev->driver.

If there are no other preferences I'd got with the first approach for
v2.

Best regards and thanks for catching,
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [PATCH v1 4/5] PCI: Adapt all code locations to not use struct pci_dev::driver directly

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 1063 bytes --]

Hello Boris,

On Fri, Jul 30, 2021 at 04:37:31PM -0400, Boris Ostrovsky wrote:
> On 7/29/21 4:37 PM, Uwe Kleine-König wrote:
> > --- a/drivers/pci/xen-pcifront.c
> > +++ b/drivers/pci/xen-pcifront.c
> > @@ -599,12 +599,12 @@ static pci_ers_result_t pcifront_common_process(int cmd,
> >  	result = PCI_ERS_RESULT_NONE;
> >  
> >  	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
> > -	if (!pcidev || !pcidev->driver) {
> > +	pdrv = pci_driver_of_dev(pcidev);
> > +	if (!pcidev || !pdrv) {
> 
> If pcidev is NULL we are dead by the time we reach 'if' statement.

Oh, you're right. So this needs something like:

	if (!pcidev || !(pdrv = pci_driver_of_dev(pcidev)))

or repeating the call to pci_driver_of_dev for each previous usage of
pdev->driver.

If there are no other preferences I'd got with the first approach for
v2.

Best regards and thanks for catching,
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

[-- Attachment #2: signature.asc --]
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Re: [PATCH v1 4/5] PCI: Adapt all code locations to not use struct pci_dev::driver directly

[Boris Ostrovsky]

On 7/31/21 8:08 AM, Uwe Kleine-König wrote:
> Hello Boris,
>
> On Fri, Jul 30, 2021 at 04:37:31PM -0400, Boris Ostrovsky wrote:
>> On 7/29/21 4:37 PM, Uwe Kleine-König wrote:
>>> --- a/drivers/pci/xen-pcifront.c
>>> +++ b/drivers/pci/xen-pcifront.c
>>> @@ -599,12 +599,12 @@ static pci_ers_result_t pcifront_common_process(int cmd,
>>>  	result = PCI_ERS_RESULT_NONE;
>>>  
>>>  	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
>>> -	if (!pcidev || !pcidev->driver) {
>>> +	pdrv = pci_driver_of_dev(pcidev);
>>> +	if (!pcidev || !pdrv) {
>> If pcidev is NULL we are dead by the time we reach 'if' statement.
> Oh, you're right. So this needs something like:
>
> 	if (!pcidev || !(pdrv = pci_driver_of_dev(pcidev)))


Sure, that's fine. And while at it please also drop 'if (pdrv)' check below (it's not directly related to your change but is more noticeable now so since you are in that function anyway I'd appreciate if you could do that).


Thanks.

-boris


>
> or repeating the call to pci_driver_of_dev for each previous usage of
> pdev->driver.
>
> If there are no other preferences I'd got with the first approach for
> v2.
>
> Best regards and thanks for catching,
> Uwe
>

Re: [PATCH v1 4/5] PCI: Adapt all code locations to not use struct pci_dev::driver directly

[Boris Ostrovsky]

On 7/31/21 8:08 AM, Uwe Kleine-König wrote:
> Hello Boris,
>
> On Fri, Jul 30, 2021 at 04:37:31PM -0400, Boris Ostrovsky wrote:
>> On 7/29/21 4:37 PM, Uwe Kleine-König wrote:
>>> --- a/drivers/pci/xen-pcifront.c
>>> +++ b/drivers/pci/xen-pcifront.c
>>> @@ -599,12 +599,12 @@ static pci_ers_result_t pcifront_common_process(int cmd,
>>>  	result = PCI_ERS_RESULT_NONE;
>>>  
>>>  	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
>>> -	if (!pcidev || !pcidev->driver) {
>>> +	pdrv = pci_driver_of_dev(pcidev);
>>> +	if (!pcidev || !pdrv) {
>> If pcidev is NULL we are dead by the time we reach 'if' statement.
> Oh, you're right. So this needs something like:
>
> 	if (!pcidev || !(pdrv = pci_driver_of_dev(pcidev)))


Sure, that's fine. And while at it please also drop 'if (pdrv)' check below (it's not directly related to your change but is more noticeable now so since you are in that function anyway I'd appreciate if you could do that).


Thanks.

-boris


>
> or repeating the call to pci_driver_of_dev for each previous usage of
> pdev->driver.
>
> If there are no other preferences I'd got with the first approach for
> v2.
>
> Best regards and thanks for catching,
> Uwe
>