Commit 21491412 authored by Jens Axboe's avatar Jens Axboe

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
...@@ -206,6 +206,22 @@ void blk_delay_queue(struct request_queue *q, unsigned long msecs) ...@@ -206,6 +206,22 @@ void blk_delay_queue(struct request_queue *q, unsigned long msecs)
} }
EXPORT_SYMBOL(blk_delay_queue); 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 * blk_start_queue - restart a previously stopped queue
* @q: The &struct request_queue in question * @q: The &struct request_queue in question
......
...@@ -797,6 +797,7 @@ extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, ...@@ -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 int blk_queue_enter(struct request_queue *q, gfp_t gfp);
extern void blk_queue_exit(struct request_queue *q); extern void blk_queue_exit(struct request_queue *q);
extern void blk_start_queue(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_stop_queue(struct request_queue *q);
extern void blk_sync_queue(struct request_queue *q); extern void blk_sync_queue(struct request_queue *q);
extern void __blk_stop_queue(struct request_queue *q); extern void __blk_stop_queue(struct request_queue *q);
......
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