linux-kernel - [PATCH] mptcp: Remove redundant assignment to remaining

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Date:   Tue, 15 Jun 2021 18:55:38 +0800
From:   Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
To:     mathew.j.martineau@...ux.intel.com
Cc:     matthieu.baerts@...sares.net, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, mptcp@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Subject: [PATCH] mptcp: Remove redundant assignment to remaining

Variable remaining is assigned, but this value is never read as it is
not used later on, hence it is a redundant assignment and can be
removed.

Clean up the following clang-analyzer warning:

net/mptcp/options.c:779:3: warning: Value stored to 'remaining' is never
read [clang-analyzer-deadcode.DeadStores].

net/mptcp/options.c:547:3: warning: Value stored to 'remaining' is never
read [clang-analyzer-deadcode.DeadStores].

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
---
 net/mptcp/options.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 9b263f2..f99272f 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -544,7 +544,6 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
 
 		map_size = TCPOLEN_MPTCP_DSS_BASE + TCPOLEN_MPTCP_DSS_MAP64;
 
-		remaining -= map_size;
 		dss_size = map_size;
 		if (mpext)
 			opts->ext_copy = *mpext;
@@ -776,7 +775,6 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
 
 	if (mptcp_established_options_mp_prio(sk, &opt_size, remaining, opts)) {
 		*size += opt_size;
-		remaining -= opt_size;
 		ret = true;
 	}
 
-- 
1.8.3.1