diff options
| author |   Paul Menage <menage@google.com> | 2009-01-29 14:25:22 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-29 18:04:45 -0800 |
| commit | 839ec5452ebfd5905b9c69b20ceb640903a8ea1a (patch) | |
| tree | 42e371a4230c50c3cb34c92e80f5fa199b01dd2b | |
| parent | cgroups: add cpu_relax() calls in css_tryget() and cgroup_clear_css_refs() (diff) | |
| download | linux-dev-839ec5452ebfd5905b9c69b20ceb640903a8ea1a.tar.xz linux-dev-839ec5452ebfd5905b9c69b20ceb640903a8ea1a.zip | |
cgroup: fix root_count when mount fails due to busy subsystem
root_count was being incremented in cgroup_get_sb() after all error
checking was complete, but decremented in cgroup_kill_sb(), which can be
called on a superblock that we gave up on due to an error. This patch
changes cgroup_kill_sb() to only decrement root_count if the root was
previously linked into the list of roots.
Signed-off-by: Paul Menage <menage@google.com>
Tested-by: Serge Hallyn <serue@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/cgroup.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 492215d67fa5..5a54ff42874e 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1115,8 +1115,10 @@ static void cgroup_kill_sb(struct super_block *sb) { } write_unlock(&css_set_lock); - list_del(&root->root_list); - root_count--; + if (!list_empty(&root->root_list)) { + list_del(&root->root_list); + root_count--; + } mutex_unlock(&cgroup_mutex); |