[OpenWrt-Devel] [PATCH 1/2] om-watchdog: Stop om-watchdog via procd before rebooting

[Sven Eckelmann]

From: Sven Eckelmann <sven.eckelmann at open-mesh.com>

It was noticed that the system can hang during the reboot before the kernel
actually triggers the system reset and before all processes are stopped. The
watchdog didn't automatically restart the system because the om-watchdog
process was still running and triggering the hardware watchdog.

Instead the system should stop the watchdog during the shutdown to get the
benefit of an hardware reset in case of an software related problem. This stop
can be done quite easily with procd because it keeps track of its started
processes.

Signed-off-by: Sven Eckelmann <sven.eckelmann at open-mesh.com>
---
 package/kernel/om-watchdog/files/om-watchdog.init | 32 +++++++++++++++++------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/package/kernel/om-watchdog/files/om-watchdog.init b/package/kernel/om-watchdog/files/om-watchdog.init
index c792968..47105f2 100644
--- a/package/kernel/om-watchdog/files/om-watchdog.init
+++ b/package/kernel/om-watchdog/files/om-watchdog.init
@@ -4,33 +4,49 @@
 #
 
 START=11
+STOP=11
 
-SERVICE_DAEMONIZE=1
+USE_PROCD=1
+NAME=om-watchdog
+PROG=/sbin/om-watchdog
 
-boot() {
+get_gpio() {
 	if [ -r /lib/ar71xx.sh ]; then
 		. /lib/ar71xx.sh
 		local board=$(ar71xx_board_name)
 
 		case "$board" in
 			"om2p"|"om2p-hs"|"om2p-hsv2")
-				service_start /sbin/om-watchdog 12
+				return 12
 				;;
 			"om2pv2"|"om2p-lc")
-				service_start /sbin/om-watchdog 26
+				return 26
 				;;
 			"om5p"|"om5p-an")
-				service_start /sbin/om-watchdog 11
+				return 11
 				;;
 			"mr600v2")
-				service_start /sbin/om-watchdog 15
+				return 15
 				;;
 			"mr900"|"mr900v2"|"mr1750")
-				service_start /sbin/om-watchdog 16
+				return 16
 				;;
 		esac
 	else
 		#we assume it is om1p in this case
-		service_start /sbin/om-watchdog 3
+		return 3
 	fi
+
+	return 255
+}
+
+start_service() {
+	get_gpio
+	gpio="$?"
+	[ "$gpio" != "255" ] || return
+
+	procd_open_instance
+	procd_set_param command "${PROG}" "${gpio}"
+	procd_set_param respawn
+	procd_close_instance
 }
-- 
2.7.0
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