X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;ds=sidebyside;f=kernel%2Fcgroup.c;h=b1a0f5a528fe6563badc393f96db9e4cfa2d9255;hb=d11c563dd20ff35da5652c3e1c989d9e10e1d6d0;hp=1fbcc748044a7f3dc367381838289ecce3992652;hpb=840f51ffe126123e748df0f36c411a90db1efd93;p=mirror_ubuntu-zesty-kernel.git

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 1fbcc748044a..b1a0f5a528fe 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -166,6 +166,20 @@ static DEFINE_SPINLOCK(hierarchy_id_lock);
  */
 static int need_forkexit_callback __read_mostly;
 
+#ifdef CONFIG_PROVE_LOCKING
+int cgroup_lock_is_held(void)
+{
+	return lockdep_is_held(&cgroup_mutex);
+}
+#else /* #ifdef CONFIG_PROVE_LOCKING */
+int cgroup_lock_is_held(void)
+{
+	return mutex_is_locked(&cgroup_mutex);
+}
+#endif /* #else #ifdef CONFIG_PROVE_LOCKING */
+
+EXPORT_SYMBOL_GPL(cgroup_lock_is_held);
+
 /* convenient tests for these bits */
 inline int cgroup_is_removed(const struct cgroup *cgrp)
 {
@@ -2936,14 +2950,17 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 
 	for_each_subsys(root, ss) {
 		struct cgroup_subsys_state *css = ss->create(ss, cgrp);
+
 		if (IS_ERR(css)) {
 			err = PTR_ERR(css);
 			goto err_destroy;
 		}
 		init_cgroup_css(css, ss, cgrp);
-		if (ss->use_id)
-			if (alloc_css_id(ss, parent, cgrp))
+		if (ss->use_id) {
+			err = alloc_css_id(ss, parent, cgrp);
+			if (err)
 				goto err_destroy;
+		}
 		/* At error, ->destroy() callback has to free assigned ID. */
 	}