tree 700871e846f19f24a2d16b61e62d0ce01a706eb8
parent e6cdb0929fe6726ba5203fc5529b74564d98a9e9
author Jens Axboe <axboe@fb.com> 1401818389 -0600
committer Jens Axboe <axboe@fb.com> 1401851079 -0600

blk-mq: handle NULL req return from blk_map_request in single queue mode

blk_mq_map_request() can return NULL if we fail entering the queue
(dying, or removed), in which case it has already ended IO on the
bio. So nothing more to do, except just return.

Signed-off-by: Jens Axboe <axboe@fb.com>