upcall: Avoid divide-by-zero calculating flow limit

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>

diff --git a/ofproto/ofproto-dpif-upcall.c b/ofproto/ofproto-dpif-upcall.c
index aa39366..01793c7 100644 (file)
--- a/ofproto/ofproto-dpif-upcall.c
+++ b/ofproto/ofproto-dpif-upcall.c
@@ -596,7 +596,7 @@ udpif_flow_dumper(void *arg)
             ovs_mutex_unlock(&revalidator->mutex);
         }
 
-        duration = time_msec() - start_time;
+        duration = MAX(time_msec() - start_time, 1);
         udpif->dump_duration = duration;
         atomic_read(&udpif->flow_limit, &flow_limit);
         if (duration > 2000) {