[Intel-gfx] [PATCH v4 07/12] drm/i915: GEM operations need to be done under the big lock
chris at chris-wilson.co.uk
Thu Feb 11 10:13:30 UTC 2016
On Tue, Feb 02, 2016 at 02:46:19PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> VMA creation and GEM list management need the big lock.
> Mutex unlock ended on the wrong path somehow. (0-day, Julia Lawall)
> Not to mention drm_gem_object_unreference was there in existing
> code with no mutex held.
> Some callers of i915_gem_object_create_stolen_for_preallocated
> already hold the lock so move the mutex into the other caller
> as well.
> Changed to lockdep_assert_held. (Chris Wilson)
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
Daniel, what did you think of having a config option to turn
lockdep_assert_held into WARN_ON(!mutex_is_locked()) when lockdep is not
Chris Wilson, Intel Open Source Technology Centre
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