diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index ec16c9b..64d4b27 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -388,8 +388,12 @@
 	sock_init_data(sock, sk);
 
 	nlk = nlk_sk(sk);
-	nlk->cb_mutex = cb_mutex ? : &nlk->cb_def_mutex;
-	mutex_init(nlk->cb_mutex);
+	if (cb_mutex)
+		nlk->cb_mutex = cb_mutex;
+	else {
+		nlk->cb_mutex = &nlk->cb_def_mutex;
+		mutex_init(nlk->cb_mutex);
+	}
 	init_waitqueue_head(&nlk->wait);
 
 	sk->sk_destruct = netlink_sock_destruct;