On Fri, Oct 15, 2021 at 05:14:10PM +0200, Sebastian Andrzej Siewior wrote:

+void blk_mq_complete_request_direct(struct request *rq)
+{
+	WRITE_ONCE(rq->state, MQ_RQ_COMPLETE);
+	rq->q->mq_ops->complete(rq);
+}

As this is called by the driver we known what ->complete this helper
would call.  So instead of doing this we could just call
blk_mq_set_request_complete and the actual completion helper.
The comment above it will need some updates of course.