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authorPaul Menage <menage@google.com>2009-01-07 18:07:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:03 -0800
commita47295e6bc42ad35f9c15ac66f598aa24debd4e2 (patch)
treecb765e996ef35ae88e29d60796655d0d35e8cf5e /security/device_cgroup.c
parente7b80bb695a5b64c92e314838e083b2f3bdf29b2 (diff)
downloadvexpress-lsk-a47295e6bc42ad35f9c15ac66f598aa24debd4e2.tar.gz
cgroups: make cgroup_path() RCU-safe
Fix races between /proc/sched_debug by freeing cgroup objects via an RCU callback. Thus any cgroup reference obtained from an RCU-safe source will remain valid during the RCU section. Since dentries are also RCU-safe, this allows us to traverse up the tree safely. Additionally, make cgroup_path() check for a NULL cgrp->dentry to avoid trying to report a path for a partially-created cgroup. [lizf@cn.fujitsu.com: call deactive_super() in cgroup_diput()] Signed-off-by: Paul Menage <menage@google.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Tested-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/device_cgroup.c')
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