3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <v...@zeniv.linux.org.uk>


[ Upstream commit 9ee332d99e4d5a97548943b81c54668450ce641b ]

Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 fs/super.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/super.c
+++ b/fs/super.c
@@ -476,7 +476,11 @@ retry:
        hlist_add_head(&s->s_instances, &type->fs_supers);
        spin_unlock(&sb_lock);
        get_filesystem(type);
-       register_shrinker(&s->s_shrink);
+       err = register_shrinker(&s->s_shrink);
+       if (err) {
+               deactivate_locked_super(s);
+               s = ERR_PTR(err);
+       }
        return s;
 }
 


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