commitb4a567e811upstream. ->queue_rq() should return one of the BLK_MQ_RQ_QUEUE_* constants, not an errno. Fixes:f4aa4c7bba("block: loop: convert to per-device workqueue") Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>