Merge branch 'linux-4.14.y_for_4.14-2.0.x-imx' into 4.14-2.0.x-imx

1 files changed, 16 insertions, 10 deletions

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 109c32c56de7..694b1cc8d144 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -187,7 +187,7 @@ static u64 css_serial_nr_next = 1;
  */
 static u16 have_fork_callback __read_mostly;
 static u16 have_exit_callback __read_mostly;
-static u16 have_free_callback __read_mostly;
+static u16 have_release_callback __read_mostly;
 static u16 have_canfork_callback __read_mostly;
 
 /* cgroup namespace for init task */
@@ -1692,7 +1692,7 @@ static int parse_cgroup_root_flags(char *data, unsigned int *root_flags)
 
 	*root_flags = 0;
 
-	if (!data)
+	if (!data || *data == '\0')
 		return 0;
 
 	while ((token = strsep(&data, ",")) != NULL) {
@@ -1942,7 +1942,7 @@ struct dentry *cgroup_do_mount(struct file_system_type *fs_type, int flags,
 			       struct cgroup_namespace *ns)
 {
 	struct dentry *dentry;
-	bool new_sb;
+	bool new_sb = false;
 
 	dentry = kernfs_mount(fs_type, flags, root->kf_root, magic, &new_sb);
 
@@ -1952,6 +1952,7 @@ struct dentry *cgroup_do_mount(struct file_system_type *fs_type, int flags,
 	 */
 	if (!IS_ERR(dentry) && ns != &init_cgroup_ns) {
 		struct dentry *nsdentry;
+		struct super_block *sb = dentry->d_sb;
 		struct cgroup *cgrp;
 
 		mutex_lock(&cgroup_mutex);
@@ -1962,12 +1963,14 @@ struct dentry *cgroup_do_mount(struct file_system_type *fs_type, int flags,
 		spin_unlock_irq(&css_set_lock);
 		mutex_unlock(&cgroup_mutex);
 
-		nsdentry = kernfs_node_dentry(cgrp->kn, dentry->d_sb);
+		nsdentry = kernfs_node_dentry(cgrp->kn, sb);
 		dput(dentry);
+		if (IS_ERR(nsdentry))
+			deactivate_locked_super(sb);
 		dentry = nsdentry;
 	}
 
-	if (IS_ERR(dentry) || !new_sb)
+	if (!new_sb)
 		cgroup_put(&root->cgrp);
 
 	return dentry;
@@ -5109,7 +5112,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss, bool early)
 
 	have_fork_callback |= (bool)ss->fork << ss->id;
 	have_exit_callback |= (bool)ss->exit << ss->id;
-	have_free_callback |= (bool)ss->free << ss->id;
+	have_release_callback |= (bool)ss->release << ss->id;
 	have_canfork_callback |= (bool)ss->can_fork << ss->id;
 
 	/* At system boot, before all subsystems have been
@@ -5543,16 +5546,19 @@ void cgroup_exit(struct task_struct *tsk)
 	} while_each_subsys_mask();
 }
 
-void cgroup_free(struct task_struct *task)
+void cgroup_release(struct task_struct *task)
 {
-	struct css_set *cset = task_css_set(task);
 	struct cgroup_subsys *ss;
 	int ssid;
 
-	do_each_subsys_mask(ss, ssid, have_free_callback) {
-		ss->free(task);
+	do_each_subsys_mask(ss, ssid, have_release_callback) {
+		ss->release(task);
 	} while_each_subsys_mask();
+}
 
+void cgroup_free(struct task_struct *task)
+{
+	struct css_set *cset = task_css_set(task);
 	put_css_set(cset);
 }