Re: [PATCH v4 4/8] PCI: replace pci_dev::driver usage that gets the driver name
From: Bjorn Helgaas <helgaas@kernel.org>
Date: 2021-09-28 17:18:04
Also in:
linux-crypto, linux-pci, linux-wireless, lkml, netdev
[+to Oliver, Russell for eeh_driver_name() question below] On Mon, Sep 27, 2021 at 10:43:22PM +0200, Uwe Kleine-König wrote:
From: Uwe Kleine-König <redacted> struct pci_dev::driver holds (apart from a constant offset) the same data as struct pci_dev::dev->driver. With the goal to remove struct pci_dev::driver to get rid of data duplication replace getting the driver name by dev_driver_string() which implicitly makes use of struct pci_dev::dev->driver.
When you repost to fix the build issue, can you capitalize the subject line to match the other? Also, would you mind using "pci_dev.driver" instead of "pci_dev::driver"? AFAIK, the "::" operator is not actually part of C, so I think it's more confusing than useful.
quoted hunk ↗ jump to hunk
Signed-off-by: Uwe Kleine-König <redacted> --- arch/powerpc/include/asm/ppc-pci.h | 9 ++++++++- drivers/bcma/host_pci.c | 7 ++++--- drivers/crypto/hisilicon/qm.c | 2 +- drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 2 +- drivers/net/ethernet/marvell/prestera/prestera_pci.c | 2 +- drivers/net/ethernet/mellanox/mlxsw/pci.c | 2 +- drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c | 2 +- drivers/ssb/pcihost_wrapper.c | 8 +++++--- 8 files changed, 22 insertions(+), 12 deletions(-)diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h index 2b9edbf6e929..e8f1795a2acf 100644 --- a/arch/powerpc/include/asm/ppc-pci.h +++ b/arch/powerpc/include/asm/ppc-pci.h@@ -57,7 +57,14 @@ 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>"; + if (pdev) { + const char *drvstr = dev_driver_string(&pdev->dev); + + if (strcmp(drvstr, "")) + return drvstr; + } + + return "<null>";
Can we just do this?
if (pdev)
return dev_driver_string(&pdev->dev);
return "<null>";
I think it's more complicated than it's worth to include a strcmp().
It's possible this will change those error messages about "Might be
infinite loop in %s driver", but that doesn't seem like a huge deal.
I moved Oliver to "to:" and added Russell in case they object.
quoted hunk ↗ jump to hunk
} #endif /* CONFIG_EEH */diff --git a/drivers/bcma/host_pci.c b/drivers/bcma/host_pci.c index 69c10a7b7c61..0973022d4b13 100644 --- a/drivers/bcma/host_pci.c +++ b/drivers/bcma/host_pci.c@@ -175,9 +175,10 @@ static int bcma_host_pci_probe(struct pci_dev *dev, if (err) goto err_kfree_bus; - name = dev_name(&dev->dev); - if (dev->driver && dev->driver->name) - name = dev->driver->name; + name = dev_driver_string(&dev->dev); + if (!strcmp(name, "")) + name = dev_name(&dev->dev); err = pci_request_regions(dev, name);
Again seems more complicated than it's worth to me. This is in the driver's .probe() method, so really_probe() has already set "dev->driver = drv", which means dev->driver is always set to &bcma_pci_bridge_driver here, and bcma_pci_bridge_driver.name is always "bcma-pci-bridge". Almost all callers of pci_request_regions() just hardcode the driver name or use a DRV_NAME #define So I think we should just do: err = pci_request_regions(dev, "bcma-pci-bridge");
quoted hunk ↗ jump to hunk
if (err) goto err_pci_disable;diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c index 369562d34d66..8f361e54e524 100644 --- a/drivers/crypto/hisilicon/qm.c +++ b/drivers/crypto/hisilicon/qm.c@@ -3085,7 +3085,7 @@ static int qm_alloc_uacce(struct hisi_qm *qm) }; int ret; - ret = strscpy(interface.name, pdev->driver->name, + ret = strscpy(interface.name, dev_driver_string(&pdev->dev), sizeof(interface.name)); if (ret < 0) return -ENAMETOOLONG;diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c index 7ea511d59e91..f279edfce3f1 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c@@ -606,7 +606,7 @@ static void hns3_get_drvinfo(struct net_device *netdev, return; } - strncpy(drvinfo->driver, h->pdev->driver->name, + strncpy(drvinfo->driver, dev_driver_string(&h->pdev->dev), sizeof(drvinfo->driver)); drvinfo->driver[sizeof(drvinfo->driver) - 1] = '\0';diff --git a/drivers/net/ethernet/marvell/prestera/prestera_pci.c b/drivers/net/ethernet/marvell/prestera/prestera_pci.c index a250d394da38..a8f007f6dad2 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 = dev_driver_string(&pdev->dev); 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..8f306364f7bf 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 = dev_driver_string(&pdev->dev); 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 0685ece1f155..23dfb599c828 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, dev_driver_string(&pdev->dev), 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/ssb/pcihost_wrapper.c b/drivers/ssb/pcihost_wrapper.c index 410215c16920..4938ed5cfae5 100644 --- a/drivers/ssb/pcihost_wrapper.c +++ b/drivers/ssb/pcihost_wrapper.c@@ -78,9 +78,11 @@ static int ssb_pcihost_probe(struct pci_dev *dev, err = pci_enable_device(dev); if (err) goto err_kfree_ssb; - name = dev_name(&dev->dev); - if (dev->driver && dev->driver->name) - name = dev->driver->name; + + name = dev_driver_string(&dev->dev); + if (*name == '\0') + name = dev_name(&dev->dev); + err = pci_request_regions(dev, name);
Also seems like more trouble than it's worth. This one is a little strange but is always called for either b43_pci_bridge_driver or b44_pci_driver, both of which have .name set, so I think we should simply do: err = pci_request_regions(dev, dev_driver_string(&dev->dev));
if (err) goto err_pci_disable; -- 2.30.2