linux-kernel - Re: [PATCH] ipv6: remove useless assignment to newinet in tcp_v6_syn_recv

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Date:   Thu, 4 Nov 2021 09:44:26 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Nghia Le <nghialm78@...il.com>, edumazet@...gle.com,
        davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        kuba@...nel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kernel-janitors@...r.kernel.org,
        lukas.bulwahn@...il.com
Subject: Re: [PATCH] ipv6: remove useless assignment to newinet in
 tcp_v6_syn_recv_sock()



On 11/4/21 7:37 AM, Nghia Le wrote:
> The newinet value is initialized with inet_sk() in a block code to
> handle sockets for the ETH_P_IP protocol. Along this code path,
> newinet is never read. Thus, assignment to newinet is needless and
> can be removed.
> 
> Signed-off-by: Nghia Le <nghialm78@...il.com>
> ---
>  net/ipv6/tcp_ipv6.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
> index 2cc9b0e53ad1..551fce49841d 100644
> --- a/net/ipv6/tcp_ipv6.c
> +++ b/net/ipv6/tcp_ipv6.c
> @@ -1263,7 +1263,6 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
>  
>  		inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk);
>  
> -		newinet = inet_sk(newsk);
>  		newnp = tcp_inet6_sk(newsk);
>  		newtp = tcp_sk(newsk);
>  
> 

Reviewed-by: Eric Dumazet <edumazet@...gle.com>