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>
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@ -438,7 +438,8 @@ static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
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continue;
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for (i = 0; i < drhd->devices_cnt; i++)
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if (drhd->devices[i]->bus->number == bus &&
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if (drhd->devices[i] &&
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drhd->devices[i]->bus->number == bus &&
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drhd->devices[i]->devfn == devfn)
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return drhd->iommu;
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