tree 23a93cdb0dfacd4b89b42c192a6247be84d105bf
parent 26251eaf98e26dc2ce2dc26d63bc502700760704
author KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> 1254437049 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1254438672 -0700

cgroup: catch bad css refcnt at css_put

__css_put() doesn't check a bug as refcnt goes to minus.
I think it should be caught. This patch adds a check for it.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>