From: Will Deacon <will.deacon@arm.com>
Date: Fri, 4 Jul 2014 10:06:01 +0000 (+0100)
Subject: iommu/arm-smmu: fix capability checking prior to device attach
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~158^2^5^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d3bca16635ae7443139c4408def7c1a50755083f;p=pandora-kernel.git

iommu/arm-smmu: fix capability checking prior to device attach

If somebody attempts to check the capability of an IOMMU domain prior to
device attach, then we'll try to dereference a NULL SMMU pointer through
the SMMU domain (since we can't determine the actual SMMU instance until
we have a device attached).

This patch fixes the capability check so that non-global features are
reported as being absent when no device is attached to the domain.

Signed-off-by: Will Deacon <will.deacon@arm.com>
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