diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 0ba3a5a1a12..271763de0b4 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -2885,7 +2885,11 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys, parent = task_cgroup(tsk, subsys->subsys_id); /* Pin the hierarchy */ - atomic_inc(&parent->root->sb->s_active); + if (!atomic_inc_not_zero(&parent->root->sb->s_active)) { + /* We race with the final deactivate_super() */ + mutex_unlock(&cgroup_mutex); + return 0; + } /* Keep the cgroup alive */ get_css_set(cg); |