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The fence lock currently protects two distinct things. It protects the fence IDR from concurrent inserts and removes and also keeps drm_sched_job_arm and drm_sched_entity_push_job in one atomic section to guarantee the fence seqno monotonicity. Split the lock into those two functions. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>