[Bridge] [PATCH 1/1] bridge: fix message_age_timer calculation

[Chris Healy]

This changes the message_age_timer calculation to use the BPDU's max age as opposed to the local bridge's max age.  This is in accordance with section 8.6.2.3.2 Step 2 of the 802.1D-1998 sprecification.

With the current implementation, when running with very large bridge diameters, convergance will not always occur even if a root bridge is configured to have a longer max age.

Tested successfully on bridge diameters of ~200.

Signed-off-by: Chris Healy <cphealy at gmail.com>
---
 net/bridge/br_stp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index 1c0a50f..f1887ba 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -209,7 +209,7 @@ static void br_record_config_information(struct net_bridge_port *p,
 	p->designated_age = jiffies - bpdu->message_age;
 
 	mod_timer(&p->message_age_timer, jiffies
-		  + (p->br->max_age - bpdu->message_age));
+		  + (bpdu->max_age - bpdu->message_age));
 }
 
 /* called under bridge lock */
-- 
1.8.1.2