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Both the .enable_signaling and .release of the null syncobj fence can be replaced by the default callbacks for a small reduction in code size. In particular the default callback for .release was changed in commite28bd101ae("drm: rename null fence to stub fence in syncobj v2") which neglected its RCU protection. Fixes:e28bd101ae("drm: rename null fence to stub fence in syncobj v2") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180920200530.2836-1-chris@chris-wilson.co.uk Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>