From c246e80d86736312933646896c4157daf511dadc Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Thu, 6 Dec 2012 14:32:01 +0100 Subject: block: Avoid that request_fn is invoked on a dead queue 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 Cc: James Bottomley Cc: Mike Christie Cc: Chanho Min Acked-by: Tejun Heo Signed-off-by: Jens Axboe --- block/blk-exec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'block/blk-exec.c') diff --git a/block/blk-exec.c b/block/blk-exec.c index 4aec98df7ba5b..1320e74d79b82 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -72,7 +72,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, __blk_run_queue(q); /* the queue is stopped so it won't be run */ if (rq->cmd_type == REQ_TYPE_PM_RESUME) - q->request_fn(q); + __blk_run_queue_uncond(q); spin_unlock_irq(q->queue_lock); } EXPORT_SYMBOL_GPL(blk_execute_rq_nowait); -- cgit v1.2.3