sget(): handle failures of register_shrinker()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/super.c b/fs/super.c
index 7ff1349609e4874a35268876065490d77f5e01ab..06bd25d90ba591f45c6f772e218ffce91c915dbc 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -517,7 +517,11 @@ 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;
 }