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intel-iommu: Fix oops in device_to_iommu() when devices not found. 

It's possible for a device in the drhd->devices[] array to be NULL if
it wasn't found at boot time, which means we have to check for that
case.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-04-06 13:30:01 -07:00
parent 276dbf9970
commit 4958c5dc7b
1 changed files with 2 additions and 1 deletions
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3
drivers/pci/intel-iommu.c
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@ -485,7 +485,8 @@ static struct intel_iommu *device_to_iommu(int segment, u8 bus, u8 devfn)
drhd->devices[i]->bus->number == bus &&
drhd->devices[i]->devfn == devfn)
return drhd->iommu;
if (drhd->devices[i]->subordinate &&
if (drhd->devices[i] &&
drhd->devices[i]->subordinate &&
drhd->devices[i]->subordinate->number <= bus &&
drhd->devices[i]->subordinate->subordinate >= bus)
return drhd->iommu;