From: Sheng Yang <sheng@linux.intel.com>
Date: Thu, 6 Aug 2009 05:31:56 +0000 (+0800)
Subject: intel-iommu: Fix enabling snooping feature by mistake
X-Git-Tag: v2.6.31-rc6~43^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c5b1525533c484238015c48c78f86d49a1bfb86b;p=pandora-kernel.git

intel-iommu: Fix enabling snooping feature by mistake

Two defects work together result in KVM device passthrough randomly can't
work:
1. iommu_snooping is not initialized to zero when vm_iommu_init() called.
So it is possible to get a random value.
2. One line added by commit 2c2e2c38("IOMMU Identity Mapping Support")
change the code path, let it bypass domain_update_iommu_cap(), as well as
missing the increment of domain iommu reference count.

The latter is also likely to cause a leak of domains on repeated VMM
assignment and deassignment.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---

Reading git-diff-tree failed