On 2013/7/20 3:14, Yinghai Lu wrote:
> 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.
It looks fine to me. Thanks!
>
> 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);
>
>
--
Thanks!
Yijing
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