--- xen-4.1.1.orig//tools/hotplug/Linux/network-bridge	2011-10-14 02:28:43.481714285 +0800
+++ xen-4.1.1.orig//tools/hotplug/Linux/network-bridge	2011-10-16 01:06:11.226673108 +0800
@@ -216,7 +216,7 @@ 
 	return
     fi
 
-    if [ `brctl show | wc -l` != 1 ]; then
+    if [ `brctl show | grep $netdev | wc -l` != 0 ]; then
         return
     fi