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igb: fix vf lookup

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Recent addition of code to find already allocated VFs failed to take
account that systems with 2 or more multi-port SR-IOV capable controllers
might have already enabled VFs.  Make sure that the VFs the function is
finding are actually subordinate to the particular instance of the adapter
that is looking for them and not subordinate to some device that has
previously enabled SR-IOV.

This is applicable to 3.2+ kernels.

CC: stable@vger.kernel.org
Reported-by: David Ahern <daahern@cisco.com>
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Robert E Garrett <robertX.e.garrett@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Greg Rose 2012-02-02 23:51:43 +00:00 committed by Jeff Kirsher
parent b868179c47
commit 0629292117
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/intel/igb/igb_main.c
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@ -5012,7 +5012,8 @@ static int igb_find_enabled_vfs(struct igb_adapter *adapter)
vf_devfn = pdev->devfn + 0x80;
pvfdev = pci_get_device(hw->vendor_id, device_id, NULL);
while (pvfdev) {
if (pvfdev->devfn == vf_devfn)
if (pvfdev->devfn == vf_devfn &&
(pvfdev->bus->number >= pdev->bus->number))
vfs_found++;
vf_devfn += vf_stride;
pvfdev = pci_get_device(hw->vendor_id,