bridgeifupdown: fix bridge initialization timing issue with wireless interface

This script introduces a minor delay when the own script
launch the wpa_supplicant daemon, however this minor delay
is needed in the boot process when the wireless interface
is loaded, if not the bridge mechanism throws an unexpected
error trying to add the interface to the bridge before the
wireless is ready to use.

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>

meta-digi-dey/recipes-core/busybox/busybox/bridgeifupdown

@@ -23,9 +23,6 @@ start_stop_wpa_supplicant() {
 		start-stop-daemon --start --quiet \
 			--name ${WPA_SUP_PNAME} --startas ${WPA_SUP_BIN} --pidfile ${WPA_SUP_PIDFILE} \
 			-- ${WPA_SUP_OPTIONS} -c ${IF_BRIDGE_WPA_CONF} -D ${IF_BRIDGE_WPA_DRIVER} -b ${IFACE}
-
-		# Wait for wireless to be ready
-		sleep 0.5
 		;;
 	stop)
 		if [ "${VERBOSITY}" = "1" ]; then
@@ -57,9 +54,14 @@ if [ "$MODE" = "start" ] && [ ! -d /sys/class/net/$IFACE ]; then
 
 	# For all the interfaces in bridge ports, attach to the bridge and remove ip
 	for port in $INTERFACES; do
-		if [ -d "/sys/class/net/${port}/wireless" ] && [ -n "${IF_BRIDGE_WPA_CONF}" ]; then
-			# Launch wpa_supplicant with bridge support
-			start_stop_wpa_supplicant ${port}
+		if [ -d "/sys/class/net/${port}/wireless" ]; then
+			if [ -n "${IF_BRIDGE_WPA_CONF}" ]; then
+				# Launch wpa_supplicant with bridge support
+				start_stop_wpa_supplicant ${port}
+			fi
+
+			# Wait for wireless to be ready
+			sleep 0.5
 		fi
 
 		# Turn up the interface and include in the bridge