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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.
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