Found hot-remove pcie card with sriov enabled cause crash in v3.10.
It is regression caused by commit ba518e3c177547dfebf7fa7252cea0c850e7ce25
(PCI: pciehp: Iterate over all devices in slot, not functions 0-7)
That commit change to use bus->devices to iterate devices under
bus to run pci_stop_and_remove_bus_device().
Actually it duplicates the problem with those bus->devices iteratation
that we try to fix in commit ac205b7bb72fa4227d2e79979bbe2b4687cdf44d
(PCI: make sriov work with hotplug remove)
Change to iterate reversely as we did last time.
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Yijing Wang <wangyijing@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> v3.9+
---
drivers/pci/hotplug/pciehp_pci.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/pci/hotplug/pciehp_pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/hotplug/pciehp_pci.c
+++ linux-2.6/drivers/pci/hotplug/pciehp_pci.c
@@ -92,7 +92,13 @@ int pciehp_unconfigure_device(struct slo
if (ret)
presence = 0;
- list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
+ /*
+ * Need to iterate device reversely, as during
+ * stop PF driver, VF will be removed, the list_for_each
+ * could point to removed VF with temp.
+ */
+ list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
+ bus_list) {
pci_dev_get(dev);
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
--
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