Ilija Hadzic a8ec3a6629 drm: correctly restore mappings if drm_open fails ... If first drm_open fails, the error-handling path will incorrectly restore inode's mapping to NULL. This can cause the crash later on. Fix by separately storing away mapping pointers that drm_open can touch and restore each from its own respective variable if the call fails. Fixes: https://bugzilla.novell.com/show_bug.cgi?id=807850 (thanks to Michal Hocko for investigating investigating and finding the root cause of the bug) Reference: http://lists.freedesktop.org/archives/dri-devel/2013-March/036564.html v2: Use one variable to store file and inode mapping since they are the same at the function entry. Fix spelling mistakes in commit message. v3: Add reference to the original bug report. Reported-by: Marco Munderloh <munderl@tnt.uni-hannover.de> Tested-by: Marco Munderloh <munderl@tnt.uni-hannover.de> Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>		2013-04-03 06:44:38 +10:00
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drm	drm: correctly restore mappings if drm_open fails	2013-04-03 06:44:38 +10:00
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