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Prevent oops at boot with VT-d

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With some broken BIOSs when VT-d is enabled, the data structures are
filled incorrectly. This can cause a NULL pointer dereference in very
early boot.

Signed-off-by: Dirk Hohndel <hohndel@linux.intel.com>
Acked-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dirk Hohndel 2009-01-11 15:33:51 +00:00 committed by Linus Torvalds
parent 37a76bd4f1
commit 288e4877f9
1 changed files with 2 additions and 1 deletions
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3
drivers/pci/intel-iommu.c
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@ -438,7 +438,8 @@ static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
continue;
for (i = 0; i < drhd->devices_cnt; i++)
if (drhd->devices[i]->bus->number == bus &&
if (drhd->devices[i] &&
drhd->devices[i]->bus->number == bus &&
drhd->devices[i]->devfn == devfn)
return drhd->iommu;