[SCSI] block: Fix blk_execute_rq_nowait() dead queue handling
If the queue is dead blk_execute_rq_nowait() doesn't invoke the done() callback function. That will result in blk_execute_rq() being stuck in wait_for_completion(). Avoid this by initializing rq->end_io to the done() callback before we check the queue state. Also, make sure the queue lock is held around the invocation of the done() callback. Found this through source code review. Signed-off-by: NMuthukumar Ratty <muthur@gmail.com> Signed-off-by: NBart Van Assche <bvanassche@acm.org> Reviewed-by: NTejun Heo <tj@kernel.org> Acked-by: NJens Axboe <axboe@kernel.dk> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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