blk-mq: fix potential oops with polling and blk-mq scheduler
If we have a scheduler attached, blk_mq_tag_to_rq() on the scheduled tags will return NULL if a request is no longer in flight. This is different than using the normal tags, where it will always return the fixed request. Check for this condition for polling, in case we happen to enter polling for a completed request. The request address remains valid, so this check and return should be perfectly safe. Fixes: bd166ef1 ("blk-mq-sched: add framework for MQ capable IO schedulers") Tested-by: NStephen Bates <sbates@raithlin.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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