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net: gain ipv4 mtu when mtu is not locked

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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@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Miaohe Lin 2020-08-24 23:20:28 -04:00 committed by David S. Miller
parent 079f921e9f
commit 8b4510d76c
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/route.c
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@ -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);
struct fib_result res;
bool lock = false;
u32 old_mtu;
if (ip_mtu_locked(dst))
return;
old_mtu = ipv4_mtu(dst);
if (old_mtu < mtu)
return;