dm: fix request-based dm's use of dm_wait_for_completion
The md->wait waitqueue is used by both bio-based and request-based DM. Commit dbd3bbd2 ("dm rq: leverage blk_mq_queue_busy() to check for outstanding IO") lost sight of the requirement that dm_wait_for_completion() must work with all types of DM devices. Fix md_in_flight() to call the blk-mq or bio-based method accordingly. Fixes: dbd3bbd2 ("dm rq: leverage blk_mq_queue_busy() to check for outstanding IO") Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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