drm/i915: Wrap the protected active RCU dereference in a helper
As we do the lockdep protected RCU lookup in a couple of places, refactor that code to a common helper i915_gem_active_raw(). Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1470728222-10243-2-git-send-email-chris@chris-wilson.co.uk
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