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| author | Alex Williamson <alex.williamson@redhat.com> | 2015-09-15 11:17:21 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <helgaas@kernel.org> | 2015-09-24 17:06:32 -0500 |
| commit | 9d9240756e63dd87d6cbf5da8b98ceb8f8192b55 (patch) | |
| tree | 42cd8cc1a0587095cc8835a8c1d454643ccddcd6 /drivers/pci/access.c | |
| parent | 38ea72bdb65df2f40ec77b2c9d1413e7f5e34465 (diff) | |
| download | lwn-9d9240756e63dd87d6cbf5da8b98ceb8f8192b55.tar.gz lwn-9d9240756e63dd87d6cbf5da8b98ceb8f8192b55.zip | |
PCI: Fix devfn for VPD access through function 0
Commit 932c435caba8 ("PCI: Add dev_flags bit to access VPD through function
0") passes PCI_SLOT(devfn) for the devfn parameter of pci_get_slot().
Generally this works because we're fairly well guaranteed that a PCIe
device is at slot address 0, but for the general case, including
conventional PCI, it's incorrect. We need to get the slot and then convert
it back into a devfn.
Fixes: 932c435caba8 ("PCI: Add dev_flags bit to access VPD through function 0")
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
Acked-by: Myron Stowe <myron.stowe@redhat.com>
Acked-by: Mark Rustad <mark.d.rustad@intel.com>
CC: stable@vger.kernel.org
Diffstat (limited to 'drivers/pci/access.c')
| -rw-r--r-- | drivers/pci/access.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/pci/access.c b/drivers/pci/access.c index 769f7e35f1a2..5a5f0a7ba801 100644 --- a/drivers/pci/access.c +++ b/drivers/pci/access.c @@ -442,7 +442,8 @@ static const struct pci_vpd_ops pci_vpd_pci22_ops = { static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count, void *arg) { - struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn)); + struct pci_dev *tdev = pci_get_slot(dev->bus, + PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); ssize_t ret; if (!tdev) @@ -456,7 +457,8 @@ static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count, static ssize_t pci_vpd_f0_write(struct pci_dev *dev, loff_t pos, size_t count, const void *arg) { - struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn)); + struct pci_dev *tdev = pci_get_slot(dev->bus, + PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); ssize_t ret; if (!tdev) @@ -475,7 +477,8 @@ static const struct pci_vpd_ops pci_vpd_f0_ops = { static int pci_vpd_f0_dev_check(struct pci_dev *dev) { - struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn)); + struct pci_dev *tdev = pci_get_slot(dev->bus, + PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); int ret = 0; if (!tdev) |