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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 <email@example.com> Cc: James Bottomley <JBottomley@Parallels.com> Cc: Mike Christie <firstname.lastname@example.org> Cc: Chanho Min <email@example.com> Acked-by: Tejun Heo <firstname.lastname@example.org> Signed-off-by: Jens Axboe <email@example.com>
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