[PATCH] net: gain ipv4 mtu when mtu is not locked

[Miaohe Lin]

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 <linmia...@huawei.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;
 
        if (ip_mtu_locked(dst))
                return;
 
+       old_mtu = ipv4_mtu(dst);
        if (old_mtu < mtu)
                return;
 
-- 
2.19.1