diff mbox series

net: gain ipv4 mtu when mtu is not locked

Message ID 20200824113528.44193-1-linmiaohe@huawei.com
State New
Headers show
Series net: gain ipv4 mtu when mtu is not locked | expand

Commit Message

Miaohe Lin Aug. 24, 2020, 11:35 a.m. UTC 
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>
---
 net/ipv4/route.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

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;
 
 	if (ip_mtu_locked(dst))
 		return;
 
+	old_mtu = ipv4_mtu(dst);
 	if (old_mtu < mtu)
 		return;