[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 <redacted>
Signed-off-by: Jiapeng Chong <redacted>
---
 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

On Tue, 15 Jun 2021, Jiapeng Chong wrote:

Hi Jiapeng, thank you for your MPTCP patch!

This change in mptcp_established_options_dss() removes the only reference 
to 'remaining' in that function, so the variable should also be removed 
from the function parameters. It also appears to be unused in 
mptcp_established_options_mp().

I'd like to handle this patch through the MPTCP tree so we can manage 
conflicts with other in-progress patches. This patch does apply to 
net-next cleanly but not our subsystem branch. You can find our git repo 
at https://github.com/multipath-tcp/mptcp_net-next, and develop patches 
using the 'export' branch. If you email a v2 patch to 
mptcp@lists.linux.dev (no need to cc other lists), Matthieu and I can make 
sure it is integrated in the MPTCP repository and handle sending it to 
netdev along with other patches from the MPTCP community.

Best regards,

--
Mat Martineau
Intel