tree 841f92409aca75ab2eadea1955d96c33b107395a
parent 228fdc083b017eaf90e578fa86fb1ecfd5ffae87
author Ming Lei <tom.leiming@gmail.com> 1388064697 +0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1389518562 +0700

block: null_blk: fix queue leak inside removing device

When queue_mode is NULL_Q_MQ and null_blk is being removed,
blk_cleanup_queue() isn't called to cleanup queue, so the queue
allocated won't be freed.

This patch calls blk_cleanup_queue() for MQ to drain all pending
requests first and release the reference counter of queue kobject, then
blk_mq_free_queue() will be called in queue kobject's release handler
when queue kobject's reference counter drops to zero.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>