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Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c15
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)