linux-kernel - Re: [PATCH] watchdog: dw: use devm_watchdog_register

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Message-ID: <b521625b-ffff-ba49-77d7-018ad363db36@roeck-us.net>
Date:   Fri, 25 Jan 2019 00:04:25 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] watchdog: dw: use devm_watchdog_register_device()

Hi,

On 1/24/19 11:52 PM, Jisheng Zhang wrote:
> Use devm_watchdog_register_device() to simplify the code.
> 
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
> ---
>   drivers/watchdog/dw_wdt.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
> index 501aebb5b81f..c053c2de5c2f 100644
> --- a/drivers/watchdog/dw_wdt.c
> +++ b/drivers/watchdog/dw_wdt.c
> @@ -303,7 +303,7 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
>   
>   	watchdog_set_restart_priority(wdd, 128);
>   
> -	ret = watchdog_register_device(wdd);
> +	ret = devm_watchdog_register_device(wdd);
>   	if (ret)
>   		goto out_disable_clk;
>   
> @@ -318,7 +318,6 @@ static int dw_wdt_drv_remove(struct platform_device *pdev)
>   {
>   	struct dw_wdt *dw_wdt = platform_get_drvdata(pdev);
>   
> -	watchdog_unregister_device(&dw_wdt->wdd);
>   	reset_control_assert(dw_wdt->rst);
>   	clk_disable_unprepare(dw_wdt->clk);
>   
> 
Unfortunately it isn't that easy. The other two calls have to be executed after
unregistering the watchdog, meaning you would have to add devm_add_action()
in the probe function to call them.

Guenter