blkcg: fix gendisk reference leak in blkg_conf_prep()
authorTejun Heo <tj@kernel.org>
Wed, 22 Jul 2015 22:05:53 +0000 (18:05 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 10 Aug 2015 19:20:30 +0000 (12:20 -0700)
commit74f412afcff28566ef240dc2a0f0af3994201fad
tree0ef398cbd0e6e471b1d189bd75d29f12d60ba80e
parent15d6dd8f74b03fcdfbb66fa45f3c3dfdaccb3f75
blkcg: fix gendisk reference leak in blkg_conf_prep()

commit 5f6c2d2b7dbb541c1e922538c49fa04c494ae3d7 upstream.

When a blkcg configuration is targeted to a partition rather than a
whole device, blkg_conf_prep fails with -EINVAL; unfortunately, it
forgets to put the gendisk ref in that case.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
block/blk-cgroup.c