watchdog: bcm47xx_wdt.c: add restart handler support

Just like in case of other watchdog drivers, use the new kernel core
API to provide restart support.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

2 files changed, 21 insertions, 1 deletions

diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c
index 9816485f6825..b28a072abf78 100644
--- a/drivers/watchdog/bcm47xx_wdt.c
+++ b/drivers/watchdog/bcm47xx_wdt.c
@@ -169,6 +169,17 @@ static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
         return NOTIFY_DONE;
 }
 
+static int bcm47xx_wdt_restart(struct notifier_block *this, unsigned long mode,
+                               void *cmd)
+{
+        struct bcm47xx_wdt *wdt;
+
+        wdt = container_of(this, struct bcm47xx_wdt, restart_handler);
+        wdt->timer_set(wdt, 1);
+
+        return NOTIFY_DONE;
+}
+
 static struct watchdog_ops bcm47xx_wdt_soft_ops = {
         .owner          = THIS_MODULE,
         .start          = bcm47xx_wdt_soft_start,
@@ -209,15 +220,23 @@ static int bcm47xx_wdt_probe(struct platform_device *pdev)
         if (ret)
                 goto err_timer;
 
-        ret = watchdog_register_device(&wdt->wdd);
+        wdt->restart_handler.notifier_call = &bcm47xx_wdt_restart;
+        wdt->restart_handler.priority = 64;
+        ret = register_restart_handler(&wdt->restart_handler);
         if (ret)
                 goto err_notifier;
 
+        ret = watchdog_register_device(&wdt->wdd);
+        if (ret)
+                goto err_handler;
+
         dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
                 timeout, nowayout ? ", nowayout" : "",
                 soft ? ", Software Timer" : "");
         return 0;
 
+err_handler:
+        unregister_restart_handler(&wdt->restart_handler);
 err_notifier:
         unregister_reboot_notifier(&wdt->notifier);
 err_timer:
diff --git a/include/linux/bcm47xx_wdt.h b/include/linux/bcm47xx_wdt.h
index b708786d4cbf..5582c211f594 100644
--- a/include/linux/bcm47xx_wdt.h
+++ b/include/linux/bcm47xx_wdt.h
@@ -16,6 +16,7 @@ struct bcm47xx_wdt {
 
         struct watchdog_device wdd;
         struct notifier_block notifier;
+        struct notifier_block restart_handler;
 
         struct timer_list soft_timer;
         atomic_t soft_ticks;