From 6142230ccf2555650dbb902a5c342a342e9b2582 Mon Sep 17 00:00:00 2001
From: Dan Wendlandt <dan@nicira.com>
Date: Wed, 25 Jan 2012 21:36:22 -0800
Subject: [PATCH] bug 921931: fix Quantum Manager VM launch race condition

Change-Id: I1f3a0f001477caa5f595c93c49f6c9e03a50149a
---
 nova/network/quantum/manager.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/nova/network/quantum/manager.py b/nova/network/quantum/manager.py
index b43365282b31..4fc6f379e7ba 100644
--- a/nova/network/quantum/manager.py
+++ b/nova/network/quantum/manager.py
@@ -364,6 +364,7 @@ class QuantumManager(manager.FloatingIP, manager.FlatManager):
                                          instance['uuid'],
                                          instance_type_id, host)
 
+    @utils.synchronized('quantum-enable-dhcp')
     def enable_dhcp(self, context, quantum_net_id, network_ref, vif_rec,
             project_id):
         LOG.info("Using DHCP for network: %s" % network_ref['label'])