intel-iommu: Fix oops with intel_iommu=igfx_off

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The hotplug notifier will call find_domain() to see if the device in
question has been assigned an IOMMU domain. However, this should never
be called for devices with a "dummy" domain, such as graphics devices
when intel_iommu=igfx_off is set and the corresponding IOMMU isn't even
initialised. If you do that, it'll oops as it dereferences the (-1)
pointer.

The notifier function should check iommu_no_mapping() for the
device before doing anything else.

Cc: stable@kernel.org
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

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This commit is contained in:

David Woodhouse 2009-12-02 10:18:30 +00:00

parent 5595b528b4

commit 44cd613c0e

1 changed files with 3 additions and 0 deletions

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drivers/pci/intel-iommu.c

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