Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *	SoftDog:	A Software Watchdog Device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *	(c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *							All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *	Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *	warranty for any of this software. This material is provided
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *	"AS-IS" and at no charge.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *	(c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *	Software only watchdog driver. Unlike its big brother the WDT501P
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *	driver this won't always recover a failed machine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/hrtimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define TIMER_MARGIN	60		/* Default is 60 seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static unsigned int soft_margin = TIMER_MARGIN;	/* in seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) module_param(soft_margin, uint, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) MODULE_PARM_DESC(soft_margin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	"Watchdog soft_margin in seconds. (0 < soft_margin < 65536, default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 					__MODULE_STRING(TIMER_MARGIN) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) MODULE_PARM_DESC(nowayout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		"Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) static int soft_noboot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) module_param(soft_noboot, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) MODULE_PARM_DESC(soft_noboot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	"Softdog action, set to 1 to ignore reboots, 0 to reboot (default=0)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static int soft_panic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) module_param(soft_panic, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) MODULE_PARM_DESC(soft_panic,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	"Softdog action, set to 1 to panic, 0 to reboot (default=0)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static char *soft_reboot_cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) module_param(soft_reboot_cmd, charp, 0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) MODULE_PARM_DESC(soft_reboot_cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	"Set reboot command. Emergency reboot takes place if unset");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static bool soft_active_on_boot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) module_param(soft_active_on_boot, bool, 0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) MODULE_PARM_DESC(soft_active_on_boot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	"Set to true to active Softdog on boot (default=false)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) static struct hrtimer softdog_ticktock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static struct hrtimer softdog_preticktock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static int reboot_kthread_fn(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	kernel_restart(soft_reboot_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	return -EPERM; /* Should not reach here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) static void reboot_work_fn(struct work_struct *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	kthread_run(reboot_kthread_fn, NULL, "softdog_reboot");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static enum hrtimer_restart softdog_fire(struct hrtimer *timer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	static bool soft_reboot_fired;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	module_put(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (soft_noboot) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		pr_crit("Triggered - Reboot ignored\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	} else if (soft_panic) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		pr_crit("Initiating panic\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		panic("Software Watchdog Timer expired");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		pr_crit("Initiating system reboot\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		if (!soft_reboot_fired && soft_reboot_cmd != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			static DECLARE_WORK(reboot_work, reboot_work_fn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			 * The 'kernel_restart' is a 'might-sleep' operation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			 * Also, executing it in system-wide workqueues blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			 * any driver from using the same workqueue in its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			 * shutdown callback function. Thus, we should execute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			 * the 'kernel_restart' in a standalone kernel thread.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			 * But since starting a kernel thread is also a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			 * 'might-sleep' operation, so the 'reboot_work' is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			 * required as a launcher of the kernel thread.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			 * After request the reboot, restart the timer to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			 * schedule an 'emergency_restart' reboot after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			 * 'TIMER_MARGIN' seconds. It's because if the softdog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			 * hangs, it might be because of scheduling issues. And
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			 * if that is the case, both 'schedule_work' and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			 * 'kernel_restart' may possibly be malfunctional at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			 * same time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			soft_reboot_fired = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			schedule_work(&reboot_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			hrtimer_add_expires_ns(timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 					(u64)TIMER_MARGIN * NSEC_PER_SEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			return HRTIMER_RESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		emergency_restart();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		pr_crit("Reboot didn't ?????\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return HRTIMER_NORESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static struct watchdog_device softdog_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static enum hrtimer_restart softdog_pretimeout(struct hrtimer *timer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	watchdog_notify_pretimeout(&softdog_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	return HRTIMER_NORESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static int softdog_ping(struct watchdog_device *w)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (!hrtimer_active(&softdog_ticktock))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		__module_get(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	hrtimer_start(&softdog_ticktock, ktime_set(w->timeout, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		      HRTIMER_MODE_REL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		if (w->pretimeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			hrtimer_start(&softdog_preticktock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 				      ktime_set(w->timeout - w->pretimeout, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 				      HRTIMER_MODE_REL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			hrtimer_cancel(&softdog_preticktock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static int softdog_stop(struct watchdog_device *w)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (hrtimer_cancel(&softdog_ticktock))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		module_put(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		hrtimer_cancel(&softdog_preticktock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static struct watchdog_info softdog_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	.identity = "Software Watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static const struct watchdog_ops softdog_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	.start = softdog_ping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	.stop = softdog_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static struct watchdog_device softdog_dev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	.info = &softdog_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	.ops = &softdog_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	.min_timeout = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	.max_timeout = 65535,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	.timeout = TIMER_MARGIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static int __init softdog_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	watchdog_init_timeout(&softdog_dev, soft_margin, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	watchdog_set_nowayout(&softdog_dev, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	watchdog_stop_on_reboot(&softdog_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	hrtimer_init(&softdog_ticktock, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	softdog_ticktock.function = softdog_fire;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		softdog_info.options |= WDIOF_PRETIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		hrtimer_init(&softdog_preticktock, CLOCK_MONOTONIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 			     HRTIMER_MODE_REL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		softdog_preticktock.function = softdog_pretimeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (soft_active_on_boot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		softdog_ping(&softdog_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	ret = watchdog_register_device(&softdog_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	pr_info("initialized. soft_noboot=%d soft_margin=%d sec soft_panic=%d (nowayout=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		soft_noboot, softdog_dev.timeout, soft_panic, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	pr_info("             soft_reboot_cmd=%s soft_active_on_boot=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		soft_reboot_cmd ?: "<not set>", soft_active_on_boot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) module_init(softdog_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static void __exit softdog_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	watchdog_unregister_device(&softdog_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) module_exit(softdog_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) MODULE_AUTHOR("Alan Cox");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) MODULE_DESCRIPTION("Software Watchdog Device Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) MODULE_LICENSE("GPL");