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Chris Wilson authored
During request construction, we take the timeline->mutex to ensure exclusive access to the ringbuffer (for command emission) and the timeline itself (for command ordering). The timeline->mutex should not be dropped by callers until we release it in i915_request_add(). lockdep provides a pin/unpin lock facility to detect accidental unlocks inside critical sections, so put it to use for request construction. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190403082132.327-1-chris@chris-wilson.co.uk
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