netdev - Re: [PATCH] net: udp: remove the redundant assignment

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Date:   Fri, 29 May 2020 04:32:49 -0700
From:   Joe Perches <joe@...ches.com>
To:     Wang Li <wangli8850@...il.com>, netdev@...r.kernel.org
Cc:     Wang Li <wangli09@...ishou.com>
Subject: Re: [PATCH] net: udp: remove the redundant assignment

On Fri, 2020-05-29 at 19:23 +0800, Wang Li wrote:
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
[]
> @@ -798,7 +798,6 @@ void udp_set_csum(bool nocheck, struct sk_buff *skb,
>  	} else if (skb_is_gso(skb)) {
>  		uh->check = ~udp_v4_check(len, saddr, daddr, 0);
>  	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
> -		uh->check = 0;
>  		uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb));

Why do you think this is redundant?

Where does uh point? (struct udphdr *uh = udp_hdr(skb);)
What is lco_csum(skb) doing?