linux-kernel - Re: [PATCH] net: gain ipv4 mtu when mtu is not locked

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Message-Id: <20200824.063628.435147255804257193.davem@davemloft.net>
Date:   Mon, 24 Aug 2020 06:36:28 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     linmiaohe@...wei.com
Cc:     kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: gain ipv4 mtu when mtu is not locked

From: Miaohe Lin <linmiaohe@...wei.com>
Date: Mon, 24 Aug 2020 07:35:28 -0400

> When mtu is locked, we should not obtain ipv4 mtu as we return immediately
> in this case and leave acquired ipv4 mtu unused.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  net/ipv4/route.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index 8ca6bcab7b03..f0a0faf58267 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -1013,13 +1013,14 @@ out:	kfree_skb(skb);
>  static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
>  {
>  	struct dst_entry *dst = &rt->dst;
> -	u32 old_mtu = ipv4_mtu(dst);
> +	u32 old_mtu;
>  	struct fib_result res;
>  	bool lock = false;

Please preserve the reverse christmas tree ordering of local variables here.