Commit b58e1769 authored Mar 28, 2017 by Josef Bacik Committed by Jens Axboe Mar 29, 2017

block-mq: don't re-queue if we get a queue error



When try to issue a request directly and we fail we will requeue the
request, but call blk_mq_end_request() as well.  This leads to the
completed request being on a queuelist and getting ended twice, which
causes list corruption in schedulers and other shenanigans.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent 457e490f

block/blk-mq.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -1475,8 +1475,6 @@ static void __blk_mq_try_issue_directly(struct request rq, blk_qc_t cookie,
		return;
		}

		__blk_mq_requeue_request(rq);

		if (ret == BLK_MQ_RQ_QUEUE_ERROR) {
		*cookie = BLK_QC_T_NONE;
		rq->errors = -EIO;
		@@ -1484,6 +1482,7 @@ static void __blk_mq_try_issue_directly(struct request rq, blk_qc_t cookie,
		return;
		}

		__blk_mq_requeue_request(rq);
		insert:
		blk_mq_sched_insert_request(rq, false, true, false, may_sleep);
		}