linux-kernel - Re: [PATCH][netdev-next] gre: remove duplicated assignment of iph

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Date:   Wed, 23 Aug 2017 14:52:26 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Colin King <colin.king@...onical.com>,
        "David S . Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        William Tu <u9012063@...il.com>
Subject: Re: [PATCH][netdev-next] gre: remove duplicated assignment of iph

On 23/08/17 14:13, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> iph is being assigned the same value twice; remove the redundant
> second assignment.
> 
> Fixes warning:
> net/ipv4/ip_gre.c:265:2: warning: Value stored to 'iph' is never read
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  net/ipv4/ip_gre.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> index 6e8a62289e03..6b3e7c99a3b6 100644
> --- a/net/ipv4/ip_gre.c
> +++ b/net/ipv4/ip_gre.c
> @@ -268,7 +268,6 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
>  	if (unlikely(!pskb_may_pull(skb, len)))
>  		return -ENOMEM;
>  
> -	iph = ip_hdr(skb);
>  	ershdr = (struct erspanhdr *)(skb->data + gre_hdr_len);
>  
>  	/* The original GRE header does not have key field,
> 

This one looks like a correct assignment, I'd remove the previous one because
pskb_may_pull may change the header pointers and the previously assigned iph might
become wrong.

Also add the author of the code to the CC list.