From: David Woodhouse <David.Woodhouse@intel.com>
Date: Wed, 2 Dec 2009 10:18:30 +0000 (+0000)
Subject: intel-iommu: Fix oops with intel_iommu=igfx_off
X-Git-Tag: v2.6.33-rc1~68^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44cd613c0e4cd93079ea2a93aa06649d8ca0830a;p=pandora-kernel.git

intel-iommu: Fix oops with intel_iommu=igfx_off

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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