[PATCH v3] leds: heartbeat: stop on shutdown, reboot or panic

Alexander Holler
2012-04-24T22:30:57Z

A halted kernel should not show a heartbeat.

Signed-off-by: Alexander Holler <holler@ahsoftware.de>
---
drivers/leds/ledtrig-heartbeat.c | 27 ++++++++++++++++++++++++++-
1 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/drivers/leds/ledtrig-heartbeat.c b/drivers/leds/ledtrig-heartbeat.c
index 759c0bb..8cfa7df 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 {
@@ -101,13 +102,37 @@ 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 struct notifier_block heartbeat_panic_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 ) {
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &heartbeat_panic_nb);
+ register_reboot_notifier(&heartbeat_reboot_nb);
+ }
+ return rc;
}

static void __exit heartbeat_trig_exit(void)
{
+ unregister_reboot_notifier(&heartbeat_reboot_nb);
+ atomic_notifier_chain_unregister(&panic_notifier_list,
+ &heartbeat_panic_nb);
led_trigger_unregister(&heartbeat_led_trigger);
}

--
1.7.6.5