linux-stable/drivers/watchdog/pretimeout_noop.c
Vladimir Zapolskiy f77710c4cd watchdog: pretimeout: add noop pretimeout governor
The change adds noop watchdog pretimeout governor, only an
informational message is printed to the kernel log buffer when a
watchdog triggers a pretimeout event.

While introducing the first pretimeout governor the selected design
assumes that the default pretimeout governor is selected by its name
and it is always built-in, thus the default pretimeout governor can
not be unregistered and the correspondent check can be removed from
the watchdog_unregister_governor() function.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2016-10-08 10:27:13 +02:00

47 lines
1.2 KiB
C

/*
* Copyright (C) 2015-2016 Mentor Graphics
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/watchdog.h>
#include "watchdog_pretimeout.h"
/**
* pretimeout_noop - No operation on watchdog pretimeout event
* @wdd - watchdog_device
*
* This function prints a message about pretimeout to kernel log.
*/
static void pretimeout_noop(struct watchdog_device *wdd)
{
pr_alert("watchdog%d: pretimeout event\n", wdd->id);
}
static struct watchdog_governor watchdog_gov_noop = {
.name = "noop",
.pretimeout = pretimeout_noop,
};
static int __init watchdog_gov_noop_register(void)
{
return watchdog_register_governor(&watchdog_gov_noop);
}
static void __exit watchdog_gov_noop_unregister(void)
{
watchdog_unregister_governor(&watchdog_gov_noop);
}
module_init(watchdog_gov_noop_register);
module_exit(watchdog_gov_noop_unregister);
MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>");
MODULE_DESCRIPTION("Panic watchdog pretimeout governor");
MODULE_LICENSE("GPL");