linux-kernel - Re: [PATCH] watchdog: core: Make use of devm_register_reboot

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Date:   Tue, 4 Apr 2017 18:47:44 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     linux-watchdog@...r.kernel.org, Chris Healy <cphealy@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] watchdog: core: Make use of devm_register_reboot_notifier()

On Tue, Apr 4, 2017 at 5:10 PM, Andrey Smirnov <andrew.smirnov@...il.com> 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