Re: [PATCH] watchdog: core: Make use of devm_register_reboot_notifier()

From: Andy Shevchenko
Date: Tue Apr 04 2017 - 11:48:04 EST


On Tue, Apr 4, 2017 at 5:10 PM, Andrey Smirnov <andrew.smirnov@xxxxxxxxx> wrote:
> Save a bit of cleanup code by leveraging newly added
> devm_register_reboot_notifier().

> @@ -247,7 +247,8 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
> if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status)) {
> wdd->reboot_nb.notifier_call = watchdog_reboot_notifier;
>
> - ret = register_reboot_notifier(&wdd->reboot_nb);

> + ret = devm_register_reboot_notifier(wdd->parent,
> + &wdd->reboot_nb);

I'm not sure it's logically correct. Perhaps binding to the actual
watchdog device would be better.
Though, Guenter can correct me.

Could it be one line after all?

> if (ret) {
> pr_err("watchdog%d: Cannot register reboot notifier (%d)\n",
> wdd->id, ret);
> @@ -302,9 +303,6 @@ static void __watchdog_unregister_device(struct watchdog_device *wdd)
> if (wdd->ops->restart)
> unregister_restart_handler(&wdd->restart_nb);
>
> - if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status))
> - unregister_reboot_notifier(&wdd->reboot_nb);
> -

--
With Best Regards,
Andy Shevchenko