Re: [PATCH] ipv4: ip_gre: Fix set but not used warning in ipgre_err() if IPv4-only

From: Kuniyuki Iwashima
Date: Mon Jan 13 2025 - 01:20:46 EST


From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Date: Sun, 12 Jan 2025 10:05:10 +0100
> @@ -191,8 +189,9 @@ static int ipgre_err(struct sk_buff *skb, u32 info,
>
> #if IS_ENABLED(CONFIG_IPV6)
> if (tpi->proto == htons(ETH_P_IPV6) &&
> - !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len,
> - type, data_len))
> + !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len, type,
> + type == ICMP_TIME_EXCEEDED ?
> + icmp_hdr(skb)->un.reserved[1] * 4 /* RFC 4884 4.1 */ : 0))
> return 0;
> #endif

No need to pack everything in a single line.

---8<---
#if IS_ENABLED(CONFIG_IPV6)
if (tpi->proto == htons(ETH_P_IPV6)) {
unsigned int data_len = 0;

if (type == ICMP_TIME_EXCEEDED)
data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */

if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len,
type, data_len)
return 0;
}
#endif
---8<---


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See: Documentation/process/maintainer-netdev.rst

Thanks