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authorPaul Menage <menage@google.com>2009-01-29 14:25:22 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-29 18:04:45 -0800
commit839ec5452ebfd5905b9c69b20ceb640903a8ea1a (patch)
tree42e371a4230c50c3cb34c92e80f5fa199b01dd2b /kernel/cgroup.c
parent804b3c28a4e4fa1c224571bf76edb534b9c4b1ed (diff)
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>
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 492215d67fa..5a54ff42874 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);