From: Alex Williamson alex.williamson@redhat.com
[ Upstream commit 76002d8b48c4b08c9bd414517dd295e132ad910b ]
Commit 0e7df22401a3 ("PCI: Add sysfs sriov_drivers_autoprobe to control VF driver binding") allows the user to specify that drivers for VFs of a PF should not be probed, but it actually causes pci_device_probe() to return success back to the driver core in this case. Therefore by all sysfs appearances the device is bound to a driver, the driver link from the device exists as does the device link back from the driver, yet the driver's probe function is never called on the device. We also fail to do any sort of cleanup when we're prohibited from probing the device, the IRQ setup remains in place and we even hold a device reference.
Instead, abort with errno before any setup or references are taken when pci_device_can_probe() prevents us from trying to probe the device.
Link: https://lore.kernel.org/lkml/155672991496.20698.4279330795743262888.stgit@gi... Fixes: 0e7df22401a3 ("PCI: Add sysfs sriov_drivers_autoprobe to control VF driver binding") Signed-off-by: Alex Williamson alex.williamson@redhat.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/pci-driver.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 33f3f475e5c6..956ee7527d2c 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -414,6 +414,9 @@ static int pci_device_probe(struct device *dev) struct pci_dev *pci_dev = to_pci_dev(dev); struct pci_driver *drv = to_pci_driver(dev->driver);
+ if (!pci_device_can_probe(pci_dev)) + return -ENODEV; + pci_assign_irq(pci_dev);
error = pcibios_alloc_irq(pci_dev); @@ -421,12 +424,10 @@ static int pci_device_probe(struct device *dev) return error;
pci_dev_get(pci_dev); - if (pci_device_can_probe(pci_dev)) { - error = __pci_device_probe(drv, pci_dev); - if (error) { - pcibios_free_irq(pci_dev); - pci_dev_put(pci_dev); - } + error = __pci_device_probe(drv, pci_dev); + if (error) { + pcibios_free_irq(pci_dev); + pci_dev_put(pci_dev); }
return error;