tree db30d630a2a170b7f67479654da43812c1d674fa
parent 7ea5fe31c12dd8bcf4a9c5a4a7e8e23826a9a3b8
author Ming Lei <tom.leiming@gmail.com> 1487758441 +0800
committer Jens Axboe <axboe@fb.com> 1488992172 -0700

blk-mq: make lifetime consistent between hctx and its kobject

This patch removes kobject_put() over hctx in __blk_mq_unregister_dev(),
and trys to keep lifetime consistent between hctx and hctx's kobject.

Now blk_mq_sysfs_register() and blk_mq_sysfs_unregister() become
totally symmetrical, and kobject's refcounter drops to zero just
when the hctx is freed.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@fb.com>