From: Han, Weidong <weidong.han@intel.com>
Date: Sat, 4 Apr 2009 09:21:26 +0000 (+0800)
Subject: x86, dmar: check if it's initialized before disable queue invalidation
X-Git-Tag: v2.6.30-rc1~175^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=34aaaa948e3c9dd65b27fa499c5c9e8d8f1227cf;p=pandora-kernel.git

x86, dmar: check if it's initialized before disable queue invalidation

If queue invalidation is disabled after it's already initialized,
dmar_enable_qi won't re-enable it due to iommu->qi is allocated.
It may result in system hang when use queue invalidation. Add this
check to avoid this case.

Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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