commit 59445b6b1f90b97c4e28062b96306bacfa4fb170
author Gao feng <gaofeng@cn.fujitsu.com> Wed Oct 19 15:34:09 2011 +0000
committer David S. Miller <davem@davemloft.net> Mon Oct 24 18:30:07 2011 -0400
tree 61408e20f1e56c98a5b377ae02079dc5c229af00
parent 1805b2f04855f07afe3a71d620a68f483b0ed74f

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>

net/ipv4/route.c

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1082460..155138d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1593,11 +1593,10 @@
 			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;
 }