linux-kernel - [PATCH net-next 6/6] mptcp: remove unused returned value of check_data

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Message-Id: <20250919-net-next-mptcp-server-side-flag-v1-6-a97a5d561a8b@kernel.org>
Date: Fri, 19 Sep 2025 14:09:03 +0200
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: Mat Martineau <martineau@...nel.org>, Geliang Tang <geliang@...nel.org>, 
 Donald Hunter <donald.hunter@...il.com>, Jakub Kicinski <kuba@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, mptcp@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Subject: [PATCH net-next 6/6] mptcp: remove unused returned value of
 check_data_fin

When working on a fix modifying mptcp_check_data_fin(), I noticed the
returned value was no longer used.

It looks like it was used for 3 days, between commit 7ed90803a213
("mptcp: send explicit ack on delayed ack_seq incr") and commit
ea4ca586b16f ("mptcp: refine MPTCP-level ack scheduling").

This returned value can be safely removed.

Reviewed-by: Geliang Tang <geliang@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
 net/mptcp/protocol.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index d9fbddb99ad0fb53f160af7654433a12c609ee25..735a209d40725f077de1056de5e1c64ffec77f55 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -545,11 +545,10 @@ static void mptcp_cleanup_rbuf(struct mptcp_sock *msk, int copied)
 	}
 }

-static bool mptcp_check_data_fin(struct sock *sk)
+static void mptcp_check_data_fin(struct sock *sk)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
 	u64 rcv_data_fin_seq;
-	bool ret = false;

 	/* Need to ack a DATA_FIN received from a peer while this side
 	 * of the connection is in ESTABLISHED, FIN_WAIT1, or FIN_WAIT2.
@@ -588,12 +587,10 @@ static bool mptcp_check_data_fin(struct sock *sk)
 			break;
 		}

-		ret = true;
 		if (!__mptcp_check_fallback(msk))
 			mptcp_send_ack(msk);
 		mptcp_close_wake_up(sk);
 	}
-	return ret;
 }

 static void mptcp_dss_corruption(struct mptcp_sock *msk, struct sock *ssk)

-- 
2.51.0