diff options
author | Dirk Hohndel <hohndel@linux.intel.com> | 2009-01-11 10:33:51 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-13 11:03:46 -0500 |
commit | 288e4877f94a3b144aadc206e7796921d02432c1 (patch) | |
tree | 468a77a0c6e22a3d1076d2d98c4dde5c3f8a3ebc /drivers | |
parent | 37a76bd4f1b716949fc38a6842e89f0ccb8384d0 (diff) |
Prevent oops at boot with VT-d
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/pci/intel-iommu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 235fb7a5a8a..3dfecb20d5e 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c | |||
@@ -438,7 +438,8 @@ static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn) | |||
438 | continue; | 438 | continue; |
439 | 439 | ||
440 | for (i = 0; i < drhd->devices_cnt; i++) | 440 | for (i = 0; i < drhd->devices_cnt; i++) |
441 | if (drhd->devices[i]->bus->number == bus && | 441 | if (drhd->devices[i] && |
442 | drhd->devices[i]->bus->number == bus && | ||
442 | drhd->devices[i]->devfn == devfn) | 443 | drhd->devices[i]->devfn == devfn) |
443 | return drhd->iommu; | 444 | return drhd->iommu; |
444 | 445 | ||