ipv4: avoid useless call of the function check_peer_pmtu

In func ipv4_dst_check,check_peer_pmtu should be called only when peer is updated.
So,if the peer is not updated in ip_rt_frag_needed,we can not inc __rt_peer_genid.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1082460..155138d 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1593,11 +1593,10 @@ unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph,
                        est_mtu = mtu;
                        peer->pmtu_learned = mtu;
                        peer->pmtu_expires = pmtu_expires;
+                       atomic_inc(&__rt_peer_genid);
                }
 
                inet_putpeer(peer);
-
-               atomic_inc(&__rt_peer_genid);
        }
        return est_mtu ? : new_mtu;
 }