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blk-mq: Let drivers cancel requeue_work

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Kicking requeued requests will start h/w queues in a work_queue, which
may alter the driver's requested state to temporarily stop them. This
patch exports a method to cancel the q->requeue_work so a driver can be
assured stopped h/w queues won't be started up before it is ready.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2015-01-07 18:55:44 -07:00 • committed by Jens Axboe
parent 973c01919b
commit c68ed59f53
2 changed files with 7 additions and 0 deletions
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include/linux/blk-mq.h
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@ -201,6 +201,7 @@ void __blk_mq_end_request(struct request *rq, int error);
void blk_mq_requeue_request(struct request *rq);
void blk_mq_add_to_requeue_list(struct request *rq, bool at_head);
void blk_mq_cancel_requeue_work(struct request_queue *q);
void blk_mq_kick_requeue_list(struct request_queue *q);
void blk_mq_complete_request(struct request *rq);