diff --git a/include/net/sock.h b/include/net/sock.h
index cce23ac4d514..7032009c0a94 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1226,6 +1226,7 @@ struct proto {
 	int			(*ioctl)(struct sock *sk, int cmd,
 					 int *karg);
 	int			(*init)(struct sock *sk);
+	void			(*init_clone)(struct sock *sk);
 	void			(*destroy)(struct sock *sk);
 	void			(*shutdown)(struct sock *sk, int how);
 	int			(*setsockopt)(struct sock *sk, int level,
diff --git a/net/core/sock.c b/net/core/sock.c
index 9abc4fe25953..747d7e479d69 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2325,6 +2325,8 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 	}
 	sk_node_init(&newsk->sk_node);
 	sock_lock_init(newsk);
+	if (prot->init_clone)
+		prot->init_clone(newsk);
 	bh_lock_sock(newsk);
 	newsk->sk_backlog.head	= newsk->sk_backlog.tail = NULL;
 	newsk->sk_backlog.len = 0;
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index f891bc714668..0a89449d45f3 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1049,13 +1049,9 @@ static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet,
 	return ret;
 }
 
-static struct lock_class_key mptcp_slock_keys[2];
-static struct lock_class_key mptcp_keys[2];
-
 static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
 					    struct mptcp_pm_addr_entry *entry)
 {
-	bool is_ipv6 = sk->sk_family == AF_INET6;
 	int addrlen = sizeof(struct sockaddr_in);
 	struct sockaddr_storage addr;
 	struct sock *newsk, *ssk;
@@ -1071,17 +1067,7 @@ static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
 	if (!newsk)
 		return -EINVAL;
 
-	/* The subflow socket lock is acquired in a nested to the msk one
-	 * in several places, even by the TCP stack, and this msk is a kernel
-	 * socket: lockdep complains. Instead of propagating the _nested
-	 * modifiers in several places, re-init the lock class for the msk
-	 * socket to an mptcp specific one.
-	 */
-	sock_lock_init_class_and_name(newsk,
-				      is_ipv6 ? "mlock-AF_INET6" : "mlock-AF_INET",
-				      &mptcp_slock_keys[is_ipv6],
-				      is_ipv6 ? "msk_lock-AF_INET6" : "msk_lock-AF_INET",
-				      &mptcp_keys[is_ipv6]);
+	mptcp_sock_lock_init(newsk);
 
 	lock_sock(newsk);
 	ssk = __mptcp_nmpc_sk(mptcp_sk(newsk));
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 37ebcb7640eb..8190618d2771 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2839,6 +2839,7 @@ static int mptcp_init_sock(struct sock *sk)
 	int ret;
 
 	__mptcp_init_sock(sk);
+	mptcp_sock_lock_init(sk);
 
 	if (!mptcp_is_enabled(net))
 		return -ENOPROTOOPT;
@@ -2865,6 +2866,26 @@ static int mptcp_init_sock(struct sock *sk)
 	return 0;
 }
 
+static struct lock_class_key mptcp_slock_keys[2];
+static struct lock_class_key mptcp_keys[2];
+
+void mptcp_sock_lock_init(struct sock *sk)
+{
+	bool is_ipv6 = sk->sk_family == AF_INET6;
+
+	/* The subflow socket lock is acquired in a nested to the msk one
+	 * in several places, even by the TCP stack, and this msk is a kernel
+	 * socket: lockdep complains. Instead of propagating the _nested
+	 * modifiers in several places, re-init the lock class for the msk
+	 * socket to an mptcp specific one.
+	 */
+	sock_lock_init_class_and_name(sk,
+				      is_ipv6 ? "mlock-AF_INET6" : "mlock-AF_INET",
+				      &mptcp_slock_keys[is_ipv6],
+				      is_ipv6 ? "msk_lock-AF_INET6" : "msk_lock-AF_INET",
+				      &mptcp_keys[is_ipv6]);
+}
+
 static void __mptcp_clear_xmit(struct sock *sk)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
@@ -3801,6 +3822,7 @@ static struct proto mptcp_prot = {
 	.name		= "MPTCP",
 	.owner		= THIS_MODULE,
 	.init		= mptcp_init_sock,
+	.init_clone	= mptcp_sock_lock_init,
 	.connect	= mptcp_connect,
 	.disconnect	= mptcp_disconnect,
 	.close		= mptcp_close,
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 3b22313d1b86..44c2ca04132f 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -795,6 +795,7 @@ void __init mptcp_proto_init(void);
 int __init mptcp_proto_v6_init(void);
 #endif
 
+void mptcp_sock_lock_init(struct sock *sk);
 struct sock *mptcp_sk_clone_init(const struct sock *sk,
 				 const struct mptcp_options_received *mp_opt,
 				 struct sock *ssk,
