kyber: make trace_block_rq call consistent with documentation

The kyber ioscheduler calls trace_block_rq_insert() *after* the request
is added to the queue but the documentation for trace_block_rq_insert()
says that the call should be made *before* the request is added to the
queue.  Move the tracepoint for the kyber ioscheduler so that it is
consistent with the documentation.

Signed-off-by: Vincent Fu <vincent.fu@samsung.com>
Link: https://lore.kernel.org/r/20210804194913.10497-1-vincent.fu@samsung.com
Reviewed by: Adam Manzanares <a.manzanares@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: vincentkfu

block/kyber-iosched.c

@@ -596,13 +596,13 @@ static void kyber_insert_requests(struct blk_mq_hw_ctx *hctx,
 		struct list_head *head = &kcq->rq_list[sched_domain];
 
 		spin_lock(&kcq->lock);
+		trace_block_rq_insert(rq);
 		if (at_head)
 			list_move(&rq->queuelist, head);
 		else
 			list_move_tail(&rq->queuelist, head);
 		sbitmap_set_bit(&khd->kcq_map[sched_domain],
 				rq->mq_ctx->index_hw[hctx->type]);
-		trace_block_rq_insert(rq);
 		spin_unlock(&kcq->lock);
 	}
 }