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block: drop custom queue draining used by scsi_transport_{iscsi|fc}
iscsi_remove_host() uses bsg_remove_queue() which implements custom queue draining. fc_bsg_remove() open-codes mostly identical logic. The draining logic isn't correct in that blk_stop_queue() doesn't prevent new requests from being queued - it just stops processing, so nothing prevents new requests to be queued after the logic determines that the queue is drained. blk_cleanup_queue() now implements proper queue draining and these custom draining logics aren't necessary. Drop them and use bsg_unregister_queue() + blk_cleanup_queue() instead. Signed-off-by: Tejun Heo <[email protected]> Reviewed-by: Mike Christie <[email protected]> Acked-by: Vivek Goyal <[email protected]> Cc: James Bottomley <[email protected]> Cc: James Smart <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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