Such function is only used inside protocol.c, there is no need
to expose it to the whole stack.

Note that the function definition most be moved earlier to avoid
forward declaration.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 net/mptcp/protocol.c | 42 +++++++++++++++++++++---------------------
 net/mptcp/protocol.h |  2 --
 2 files changed, 21 insertions(+), 23 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 8c835ba5a437a2..3653b10d24887e 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3195,6 +3195,27 @@ static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk)
 	inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr;
 }
 
+static void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags)
+{
+	struct mptcp_subflow_context *subflow, *tmp;
+	struct sock *sk = (struct sock *)msk;
+
+	__mptcp_clear_xmit(sk);
+
+	/* join list will be eventually flushed (with rst) at sock lock release time */
+	mptcp_for_each_subflow_safe(msk, subflow, tmp)
+		__mptcp_close_ssk(sk, mptcp_subflow_tcp_sock(subflow), subflow, flags);
+
+	__skb_queue_purge(&sk->sk_receive_queue);
+	skb_rbtree_purge(&msk->out_of_order_queue);
+
+	/* move all the rx fwd alloc into the sk_mem_reclaim_final in
+	 * inet_sock_destruct() will dispose it
+	 */
+	mptcp_token_destroy(msk);
+	mptcp_pm_destroy(msk);
+}
+
 static int mptcp_disconnect(struct sock *sk, int flags)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
@@ -3399,27 +3420,6 @@ void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk)
 		msk->rcvq_space.space = TCP_INIT_CWND * TCP_MSS_DEFAULT;
 }
 
-void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags)
-{
-	struct mptcp_subflow_context *subflow, *tmp;
-	struct sock *sk = (struct sock *)msk;
-
-	__mptcp_clear_xmit(sk);
-
-	/* join list will be eventually flushed (with rst) at sock lock release time */
-	mptcp_for_each_subflow_safe(msk, subflow, tmp)
-		__mptcp_close_ssk(sk, mptcp_subflow_tcp_sock(subflow), subflow, flags);
-
-	__skb_queue_purge(&sk->sk_receive_queue);
-	skb_rbtree_purge(&msk->out_of_order_queue);
-
-	/* move all the rx fwd alloc into the sk_mem_reclaim_final in
-	 * inet_sock_destruct() will dispose it
-	 */
-	mptcp_token_destroy(msk);
-	mptcp_pm_destroy(msk);
-}
-
 static void mptcp_destroy(struct sock *sk)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index a3bbce8950a5e0..dc61579282b2fc 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -979,8 +979,6 @@ static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
 	local_bh_enable();
 }
 
-void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags);
-
 #define MPTCP_TOKEN_MAX_RETRIES	4
 
 void __init mptcp_token_init(void);
-- 
2.51.0