block: clarify blk_add_timer() use case for blk-mq (3b627a3f) · Commits · 戴 / test

block/blk-timeout.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -186,6 +186,7 @@ unsigned long blk_rq_timeout(unsigned long timeout)
		* Notes:
		* Each request has its own timer, and as it is added to the queue, we
		* set up the timer. When the request completes, we cancel the timer.
		* Queue lock must be held for the non-mq case, mq case doesn't care.
		*/
		void blk_add_timer(struct request *req)
		{
		@@ -209,6 +210,11 @@ void blk_add_timer(struct request *req)
		req->timeout = q->rq_timeout;

		req->deadline = jiffies + req->timeout;

		/*
		* Only the non-mq case needs to add the request to a protected list.
		* For the mq case we simply scan the tag map.
		*/
		if (!q->mq_ops)
		list_add_tail(&req->timeout_list, &req->q->timeout_list);