locking/drm: Fix i915_gem_shrinker_lock() locking

Mike Krinkin reported hangs in the DRM code and bisected it to:

  3ab7c086d5ec72585ef0 ("locking/drm: Kill mutex trickery")

Hugh Dickins observed:

 "i915_gem_shrinker_lock() is broken: but copy the pattern from
  msm_gem_shrinker_lock() and it's okay - patch below."

Pick up the fix in isolation to make sure the bug is fixed, cleanup
patch will follow up.

Originally-From: Hugh Dickins <[email protected]>
Reported-by: Hugh Dickins <[email protected]>
Reported-by: Mike Krinkin <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions