cgroup: Merge branch 'for-3.13-fixes' into for-3.14

Pull to receive e605b36575e8 ("cgroup: fix cgroup_subsys_state leak
for seq_files") as for-3.14 is scheduled to have a lot of changes
which depend on it.

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index be42967f4f1a..34fd1be0d9bf 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -166,6 +166,7 @@ static void cgroup_destroy_css_killed(struct cgroup *cgrp);
 static int cgroup_destroy_locked(struct cgroup *cgrp);
 static int cgroup_addrm_files(struct cgroup *cgrp, struct cftype cfts[],
                               bool is_add);
+static int cgroup_file_release(struct inode *inode, struct file *file);
 
 /**
  * cgroup_css - obtain a cgroup's css for the specified subsystem
@@ -2394,7 +2395,7 @@ static const struct file_operations cgroup_seqfile_operations = {
         .read = seq_read,
         .write = cgroup_file_write,
         .llseek = seq_lseek,
-        .release = single_release,
+        .release = cgroup_file_release,
 };
 
 static int cgroup_file_open(struct inode *inode, struct file *file)
@@ -2455,6 +2456,8 @@ static int cgroup_file_release(struct inode *inode, struct file *file)
                 ret = cft->release(inode, file);
         if (css->ss)
                 css_put(css);
+        if (file->f_op == &cgroup_seqfile_operations)
+                single_release(inode, file);
         return ret;
 }