diff options
| -rw-r--r-- | lib/learning-switch.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/learning-switch.c b/lib/learning-switch.c index 4a95dc1b8..f4c79c244 100644 --- a/lib/learning-switch.c +++ b/lib/learning-switch.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc. + * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -472,7 +472,7 @@ lswitch_choose_destination(struct lswitch *sw, const struct flow *flow) uint16_t out_port; /* Learn the source MAC. */ - if (mac_learning_may_learn(sw->ml, flow->dl_src, 0)) { + if (sw->ml && mac_learning_may_learn(sw->ml, flow->dl_src, 0)) { struct mac_entry *mac = mac_learning_insert(sw->ml, flow->dl_src, 0); if (mac_entry_is_new(mac) || mac->port.i != flow->in_port) { VLOG_DBG_RL(&rl, "%016llx: learned that "ETH_ADDR_FMT" is on " |