kernfs: kernfs_sop_show_path: don't return 0 after seq_dentry call

Our caller expects 0 on success, not >0.

This fixes a bug in the patch

	cgroup, kernfs: make mountinfo show properly scoped path for cgroup namespaces

where /sys does not show up in mountinfo, breaking criu.

Thanks for catching this, Andrei.

Reported-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 3b78724..3d670a3 100644 (file)
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -50,7 +50,8 @@ static int kernfs_sop_show_path(struct seq_file *sf, struct dentry *dentry)
        if (scops && scops->show_path)
                return scops->show_path(sf, node, root);
 
-       return seq_dentry(sf, dentry, " \t\n\\");
+       seq_dentry(sf, dentry, " \t\n\\");
+       return 0;
 }
 
 const struct super_operations kernfs_sops = {