netdev - [PATCH net-next 4/6] mptcp: drop redundant test in move_skbs_to

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Message-Id: <20210621225438.10777-5-mathew.j.martineau@linux.intel.com>
Date:   Mon, 21 Jun 2021 15:54:36 -0700
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     netdev@...r.kernel.org
Cc:     Paolo Abeni <pabeni@...hat.com>, davem@...emloft.net,
        kuba@...nel.org, matthieu.baerts@...sares.net,
        mptcp@...ts.linux.dev,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 4/6] mptcp: drop redundant test in move_skbs_to_msk()

From: Paolo Abeni <pabeni@...hat.com>

Currently we check the msk state to avoid enqueuing new
skbs at msk shutdown time.

Such test is racy - as we can't acquire the msk socket lock -
and useless, as the caller already checked the subflow
field 'disposable', covering the same scenario in a race
free manner - read and updated under the ssk socket lock.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
 net/mptcp/protocol.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 3e088e9d20fd..cf75be02eb00 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -686,9 +686,6 @@ static bool move_skbs_to_msk(struct mptcp_sock *msk, struct sock *ssk)
 	struct sock *sk = (struct sock *)msk;
 	unsigned int moved = 0;
 
-	if (inet_sk_state_load(sk) == TCP_CLOSE)
-		return false;
-
 	__mptcp_move_skbs_from_subflow(msk, ssk, &moved);
 	__mptcp_ofo_queue(msk);
 	if (unlikely(ssk->sk_err)) {
-- 
2.32.0