From f1bfda4c373ff9c0fc964249c9536da849f7386d Mon Sep 17 00:00:00 2001
From: Aaron Goodman <aaronjg@stanford.edu>
Date: Tue, 27 Oct 2020 22:09:36 -0400
Subject: [PATCH] mwan3: do not wait to process ifup/ifdown events

Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>
---
 net/mwan3/files/usr/sbin/mwan3track | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/mwan3/files/usr/sbin/mwan3track b/net/mwan3/files/usr/sbin/mwan3track
index b771e8fce..d97933e09 100755
--- a/net/mwan3/files/usr/sbin/mwan3track
+++ b/net/mwan3/files/usr/sbin/mwan3track
@@ -345,8 +345,12 @@ main() {
 		get_uptime > $MWAN3TRACK_STATUS_DIR/$INTERFACE/TIME
 
 		host_up_count=0
-		sleep "${sleep_time}" &
-		wait
+		if [ "${IFDOWN_EVENT}" -ne 0 ] && [ "${IFUP_EVENT}" -ne 0 ]; then
+			sleep "${sleep_time}" &
+			SLEEP_PID=$!
+			wait
+			unset SLEEP_PID
+		fi
 
 		if [ "${IFDOWN_EVENT}" -eq 1 ]; then
 			LOG debug "Register ifdown event on interface ${INTERFACE} (${DEVICE})"