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| author | Dirk Hohndel <hohndel@linux.intel.com> | 2009-01-11 15:33:51 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-13 08:03:46 -0800 |
| commit | 288e4877f94a3b144aadc206e7796921d02432c1 (patch) | |
| tree | 468a77a0c6e22a3d1076d2d98c4dde5c3f8a3ebc /drivers/pci/intel-iommu.c | |
| parent | 37a76bd4f1b716949fc38a6842e89f0ccb8384d0 (diff) | |
| download | blackbird-op-linux-288e4877f94a3b144aadc206e7796921d02432c1.tar.gz blackbird-op-linux-288e4877f94a3b144aadc206e7796921d02432c1.zip | |
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/pci/intel-iommu.c')
| -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 235fb7a5a8a5..3dfecb20d5e7 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) 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; |
