Commit 21491412 authored by Jens Axboe's avatar Jens Axboe
Browse files

block: add blk_start_queue_async() 



We currently only have an inline/sync helper to restart a stopped
queue. If drivers need an async version, they have to roll their
own. Add a generic helper instead.

Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent d3805611

block/blk-core.c

+16 −0
Original line number Diff line number Diff line
@@ -206,6 +206,22 @@ void blk_delay_queue(struct request_queue *q, unsigned long msecs) 
}

EXPORT_SYMBOL(blk_delay_queue);



/**

 * blk_start_queue_async - asynchronously restart a previously stopped queue

 * @q:    The &struct request_queue in question

 *

 * Description:

 *   blk_start_queue_async() will clear the stop flag on the queue, and

 *   ensure that the request_fn for the queue is run from an async

 *   context.

 **/

void blk_start_queue_async(struct request_queue *q)

{

	queue_flag_clear(QUEUE_FLAG_STOPPED, q);

	blk_run_queue_async(q);

}

EXPORT_SYMBOL(blk_start_queue_async);



/**

 * blk_start_queue - restart a previously stopped queue

 * @q:    The &struct request_queue in question

include/linux/blkdev.h

+1 −0
Original line number Diff line number Diff line
@@ -797,6 +797,7 @@ extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 
extern int blk_queue_enter(struct request_queue *q, gfp_t gfp);

extern void blk_queue_exit(struct request_queue *q);

extern void blk_start_queue(struct request_queue *q);

extern void blk_start_queue_async(struct request_queue *q);

extern void blk_stop_queue(struct request_queue *q);

extern void blk_sync_queue(struct request_queue *q);

extern void __blk_stop_queue(struct request_queue *q);