From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 4 Dec 2013 14:52:06 +0000 (+0000)
Subject: drm/i915: Hold mutex across i915_gem_release
X-Git-Tag: v3.13-rc5~29^2~7^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d1430a3f4b7cfd8779b78740a4182321f3ca7f3;p=pandora-kernel.git

drm/i915: Hold mutex across i915_gem_release

Inorder to serialise the closing of the file descriptor and its
subsequent release of client requests with i915_gem_free_request(), we
need to hold the struct_mutex in i915_gem_release(). Failing to do so
has the potential to trigger an OOPS, later with a use-after-free.

Testcase: igt/gem_close_race
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70874
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71029
Reported-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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