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block: add blk_start_queue_async()

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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: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2015-12-28 13:01:22 -07:00
parent d380561113
commit 21491412f2
2 changed files with 17 additions and 0 deletions
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16
block/blk-core.c
View file

@ -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

1
include/linux/blkdev.h
View file

@ -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);