Commit 87ffc69e authored by Guenter Roeck's avatar Guenter Roeck
Browse files

watchdog: alim7101: register restart handler with kernel restart handler 



The kernel core now provides an API to trigger a system restart.  Register
with it to restart the system instead of misusing the reboot notifier.

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarHeiko Stuebner <heiko@sntech.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jonas Jensen <jonas.jensen@gmail.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent ad0e0e68

drivers/watchdog/alim7101_wdt.c

+32 −10
Original line number Diff line number Diff line
@@ -301,6 +301,28 @@ static struct miscdevice wdt_miscdev = { 
	.fops	=	&wdt_fops,

};



static int wdt_restart_handle(struct notifier_block *this, unsigned long mode,

			      void *cmd)

{

	/*

	 * Cobalt devices have no way of rebooting themselves other

	 * than getting the watchdog to pull reset, so we restart the

	 * watchdog on reboot with no heartbeat.

	 */

	wdt_change(WDT_ENABLE);



	/* loop until the watchdog fires */

	while (true)

		;



	return NOTIFY_DONE;

}



static struct notifier_block wdt_restart_handler = {

	.notifier_call = wdt_restart_handle,

	.priority = 128,

};



/*

 *	Notifier for system down

 */
@@ -311,15 +333,6 @@ static int wdt_notify_sys(struct notifier_block *this, 
	if (code == SYS_DOWN || code == SYS_HALT)

		wdt_turnoff();



	if (code == SYS_RESTART) {

		/*

		 * Cobalt devices have no way of rebooting themselves other

		 * than getting the watchdog to pull reset, so we restart the

		 * watchdog on reboot with no heartbeat

		 */

		wdt_change(WDT_ENABLE);

		pr_info("Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second\n");

	}

	return NOTIFY_DONE;

}
@@ -338,6 +351,7 @@ static void __exit alim7101_wdt_unload(void) 
	/* Deregister */

	misc_deregister(&wdt_miscdev);

	unregister_reboot_notifier(&wdt_notifier);

	unregister_restart_handler(&wdt_restart_handler);

	pci_dev_put(alim7101_pmu);

}
@@ -390,11 +404,17 @@ static int __init alim7101_wdt_init(void) 
		goto err_out;

	}



	rc = register_restart_handler(&wdt_restart_handler);

	if (rc) {

		pr_err("cannot register restart handler (err=%d)\n", rc);

		goto err_out_reboot;

	}



	rc = misc_register(&wdt_miscdev);

	if (rc) {

		pr_err("cannot register miscdev on minor=%d (err=%d)\n",

		       wdt_miscdev.minor, rc);

		goto err_out_reboot;

		goto err_out_restart;

	}



	if (nowayout)
@@ -404,6 +424,8 @@ static int __init alim7101_wdt_init(void) 
		timeout, nowayout);

	return 0;



err_out_restart:

	unregister_restart_handler(&wdt_restart_handler);

err_out_reboot:

	unregister_reboot_notifier(&wdt_notifier);

err_out:

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