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Commit c68ed59f authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

blk-mq: Let drivers cancel requeue_work 



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: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 973c0191

block/blk-mq.c

+6 −0
Original line number Diff line number Diff line
@@ -527,6 +527,12 @@ void blk_mq_add_to_requeue_list(struct request *rq, bool at_head) 
}

EXPORT_SYMBOL(blk_mq_add_to_requeue_list);



void blk_mq_cancel_requeue_work(struct request_queue *q)

{

	cancel_work_sync(&q->requeue_work);

}

EXPORT_SYMBOL_GPL(blk_mq_cancel_requeue_work);



void blk_mq_kick_requeue_list(struct request_queue *q)

{

	kblockd_schedule_work(&q->requeue_work);

include/linux/blk-mq.h

+1 −0
Original line number Diff line number Diff line
@@ -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);