Revert "PCI: Use hotplug-safe pci_get_domain_bus_and_slot()"

This reverts commit 433efd2247b0cbf5e7e86275e1f21281d3b99047.

When we remove an SR-IOV device, we have this call chain:

    driver .remove() method
        pci_disable_sriov()
            sriov_disable()
                virtfn_remove()
                    pci_get_domain_bus_and_slot()

sriov_disable() is only called for PFs, not for VFs.  When it's called
for a PF, it loops through all the VFs and calls virtfn_remove() for
each.  But we stop and remove VFs before PFs, so by the time we get
to virtfn_remove(), the VFs have already been stopped and deleted
from the device list.  Now pci_get_domain_bus_and_slot(), which uses
bus_find_device() and relies on that device list, doesn't find the
VFs, so the VF references aren't released correctly.

Reported-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index b0fe7712b4d4..aeccc911abb8 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -152,11 +152,15 @@ failed1:
 static void virtfn_remove(struct pci_dev *dev, int id, int reset)
 {
         char buf[VIRTFN_ID_LEN];
+        struct pci_bus *bus;
         struct pci_dev *virtfn;
         struct pci_sriov *iov = dev->sriov;
 
-        virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
-                        virtfn_bus(dev, id), virtfn_devfn(dev, id));
+        bus = pci_find_bus(pci_domain_nr(dev->bus), virtfn_bus(dev, id));
+        if (!bus)
+                return;
+
+        virtfn = pci_get_slot(bus, virtfn_devfn(dev, id));
         if (!virtfn)
                 return;