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block: Avoid that request_fn is invoked on a dead queue

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A block driver may start cleaning up resources needed by its
request_fn as soon as blk_cleanup_queue() finished, so request_fn
must not be invoked after draining finished. This is important
when blk_run_queue() is invoked without any requests in progress.
As an example, if blk_drain_queue() and scsi_run_queue() run in
parallel, blk_drain_queue() may have finished all requests after
scsi_run_queue() has taken a SCSI device off the starved list but
before that last function has had a chance to run the queue.

Signed-off-by: Bart Van Assche <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Mike Christie <[email protected]>
Cc: Chanho Min <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche 2012-12-06 14:32:01 +01:00 • committed by Jens Axboe
commit c246e80d86
4 changed files with 32 additions and 5 deletions
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block/blk.h
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@ -145,6 +145,8 @@ int blk_try_merge(struct request *rq, struct bio *bio);
void blk_queue_congestion_threshold(struct request_queue *q);
void __blk_run_queue_uncond(struct request_queue *q);
int blk_dev_init(void);