1 files changed, 9 insertions, 6 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index aeceb8868981..abc433772e5a 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1549,11 +1549,14 @@ static int cgroup_seqfile_show(struct seq_file *m, void *arg)
 {
         struct cgroup_seqfile_state *state = m->private;
         struct cftype *cft = state->cft;
-        struct cgroup_map_cb cb = {
-                .fill = cgroup_map_add,
-                .state = m,
-        };
-        return cft->read_map(state->cgroup, cft, &cb);
+        if (cft->read_map) {
+                struct cgroup_map_cb cb = {
+                        .fill = cgroup_map_add,
+                        .state = m,
+                };
+                return cft->read_map(state->cgroup, cft, &cb);
+        }
+        return cft->read_seq_string(state->cgroup, cft, m);
 }
 
 int cgroup_seqfile_release(struct inode *inode, struct file *file)
@@ -1581,7 +1584,7 @@ static int cgroup_file_open(struct inode *inode, struct file *file)
         cft = __d_cft(file->f_dentry);
         if (!cft)
                 return -ENODEV;
-        if (cft->read_map) {
+        if (cft->read_map || cft->read_seq_string) {
                 struct cgroup_seqfile_state *state =
                         kzalloc(sizeof(*state), GFP_USER);
                 if (!state)