PCI: Fix /sys warning when sriov enabled and card is hot removed

sysfs is a bit stricter now and emits warnings in more cases.

For SRIOV hotplug, we are calling pci_stop_dev() for each VF first
(after we update pci_stop_bus_devices) which remove each VF subdir.  So
double check the VF dir in /sys before trying to remove the physfn link.

Signed-of-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 0dab5ecf61b..687b3c8e8e3 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -173,7 +173,13 @@ static void virtfn_remove(struct pci_dev *dev, int id, int reset)
 
         sprintf(buf, "virtfn%u", id);
         sysfs_remove_link(&dev->dev.kobj, buf);
-        sysfs_remove_link(&virtfn->dev.kobj, "physfn");
+        /*
+         * pci_stop_dev() could have been called for this virtfn already,
+         * so the directory for the virtfn may have been removed before.
+         * Double check to avoid spurious sysfs warnings.
+         */
+        if (virtfn->dev.kobj.sd)
+                sysfs_remove_link(&virtfn->dev.kobj, "physfn");
 
         mutex_lock(&iov->dev->sriov->lock);
         pci_remove_bus_device(virtfn);