BigSwitch: Semaphore on port status update

Adds a semaphore to the _set_port_status
function used by the Big Switch ML2 driver and
plugin. Without it, the async threads are
susceptible to deadlocking and causing the
known eventlet/mysql timeout exception.

Closes-Bug: #1300607
Change-Id: Ie89213a0bef37f9e7a30945df39c0f1b87a33b82

diff --git a/neutron/plugins/bigswitch/plugin.py b/neutron/plugins/bigswitch/plugin.py
index a5ba320813118a397e192a8977dc749dd7c540cb..161b71f8d1c6bb906235e457c69b61776e9c9faa 100644 (file)
--- a/neutron/plugins/bigswitch/plugin.py
+++ b/neutron/plugins/bigswitch/plugin.py
@@ -436,6 +436,8 @@ class NeutronRestProxyV2Base(db_base_plugin_v2.NeutronDbPluginV2,
             # would have deleted an non-existent port.
             self.servers.rest_delete_port(tenant_id, net_id, port['id'])
 
+    # NOTE(kevinbenton): workaround for eventlet/mysql deadlock
+    @utils.synchronized('bsn-port-barrier')
     def _set_port_status(self, port_id, status):
         session = db.get_session()
         try: