Messages in this thread Patch in this message | | | From | Alexander Holler <> | Subject | [PATCH v3] leds: heartbeat: stop on shutdown, reboot or panic | Date | Wed, 25 Apr 2012 00:30:10 +0200 |
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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
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