From: Alexander Holler <holler@ahsoftware.de>
Date: Wed, 25 Apr 2012 01:04:32 +0000 (+1000)
Subject: leds: heartbeat: stop on shutdown
X-Git-Tag: next-20120430~2^2~68
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4aa3c88c920afb6783a72f538cdfe71a4814547b;p=karo-tx-linux.git

leds: heartbeat: stop on shutdown

A halted kernel should not show a heartbeat.

Signed-off-by: Alexander Holler <holler@ahsoftware.de>
Cc: Shuah Khan <shuahkhan@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/leds/ledtrig-heartbeat.c b/drivers/leds/ledtrig-heartbeat.c
index 1aacf4c6c3e4..8ec5fecf577f 100644
--- a/drivers/leds/ledtrig-heartbeat.c
+++ b/drivers/leds/ledtrig-heartbeat.c
@@ -18,6 +18,7 @@
 #include <linux/timer.h>
 #include <linux/sched.h>
 #include <linux/leds.h>
+#include <linux/reboot.h>
 #include "leds.h"
 
 struct heartbeat_trig_data {
@@ -103,13 +104,28 @@ static struct led_trigger heartbeat_led_trigger = {
 	.deactivate = heartbeat_trig_deactivate,
 };
 
+static int heartbeat_reboot_notifier(struct notifier_block *nb,
+				     unsigned long code, void *unused)
+{
+	led_trigger_unregister(&heartbeat_led_trigger);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block heartbeat_reboot_nb = {
+	.notifier_call = heartbeat_reboot_notifier,
+};
+
 static int __init heartbeat_trig_init(void)
 {
-	return led_trigger_register(&heartbeat_led_trigger);
+	int rc = led_trigger_register(&heartbeat_led_trigger);
+	if( ! rc )
+		register_reboot_notifier(&heartbeat_reboot_nb);
+	return rc;
 }
 
 static void __exit heartbeat_trig_exit(void)
 {
+	unregister_reboot_notifier(&heartbeat_reboot_nb);
 	led_trigger_unregister(&heartbeat_led_trigger);
 }