diff options
| -rw-r--r-- | kernel/cgroup.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 50b94113f4f..bf30076664c 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -4396,6 +4396,15 @@ static void css_release_work_fn(struct work_struct *work) /* cgroup release path */ cgroup_idr_remove(&cgrp->root->cgroup_idr, cgrp->id); cgrp->id = -1; + + /* + * There are two control paths which try to determine + * cgroup from dentry without going through kernfs - + * cgroupstats_build() and css_tryget_online_from_dir(). + * Those are supported by RCU protecting clearing of + * cgrp->kn->priv backpointer. + */ + RCU_INIT_POINTER(*(void __rcu __force **)&cgrp->kn->priv, NULL); } mutex_unlock(&cgroup_mutex); @@ -4834,16 +4843,6 @@ static int cgroup_rmdir(struct kernfs_node *kn) cgroup_kn_unlock(kn); - /* - * There are two control paths which try to determine cgroup from - * dentry without going through kernfs - cgroupstats_build() and - * css_tryget_online_from_dir(). Those are supported by RCU - * protecting clearing of cgrp->kn->priv backpointer, which should - * happen after all files under it have been removed. - */ - if (!ret) - RCU_INIT_POINTER(*(void __rcu __force **)&kn->priv, NULL); - cgroup_put(cgrp); return ret; } @@ -5430,7 +5429,7 @@ struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry, /* * This path doesn't originate from kernfs and @kn could already * have been or be removed at any point. @kn->priv is RCU - * protected for this access. See cgroup_rmdir() for details. + * protected for this access. See css_release_work_fn() for details. */ cgrp = rcu_dereference(kn->priv); if (cgrp) |