linux-kernel - Re: [PATCH 21/22] watchdog: mpc8xxx_wdt: Convert to use device managed functions and other improvements

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Date:   Tue, 23 Apr 2019 15:28:06 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 21/22] watchdog: mpc8xxx_wdt: Convert to use device
 managed functions and other improvements



Le 10/04/2019 à 18:28, Guenter Roeck a écrit :
> Use device managed functions to simplify error handling, reduce
> source code size, improve readability, and reduce the likelyhood of bugs.
> Other improvements as listed below.
> 
> The conversion was done automatically with coccinelle using the
> following semantic patches. The semantic patches and the scripts
> used to generate this commit log are available at
> https://github.com/groeck/coccinelle-patches
> 
> - Drop assignments to otherwise unused variables
> - Drop empty remove function
>    This also drops the inaccurate message on remove; the driver won't be
>    removed if the hardware watchdog is running, no matter if the watchdog
>    device is open or not.
> - Use local variable 'struct device *dev' consistently
> - Use devm_watchdog_register_driver() to register watchdog device
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

Reviewed-by: Christophe Leroy <christophe.leroy@....fr>

> ---
>   drivers/watchdog/mpc8xxx_wdt.c | 17 +++--------------
>   1 file changed, 3 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/watchdog/mpc8xxx_wdt.c b/drivers/watchdog/mpc8xxx_wdt.c
> index 3b5b446b690c..9b6d6a5a27ad 100644
> --- a/drivers/watchdog/mpc8xxx_wdt.c
> +++ b/drivers/watchdog/mpc8xxx_wdt.c
> @@ -204,9 +204,10 @@ static int mpc8xxx_wdt_probe(struct platform_device *ofdev)
>   	if (ddata->wdd.timeout < ddata->wdd.min_timeout)
>   		ddata->wdd.timeout = ddata->wdd.min_timeout;
>   
> -	ret = watchdog_register_device(&ddata->wdd);
> +	ret = devm_watchdog_register_device(dev, &ddata->wdd);
>   	if (ret) {
> -		dev_err(dev, "cannot register watchdog device (err=%d)\n", ret);
> +		dev_err(dev, "cannot register watchdog device (err=%d)\n",
> +			ret);
>   		return ret;
>   	}
>   
> @@ -218,17 +219,6 @@ static int mpc8xxx_wdt_probe(struct platform_device *ofdev)
>   	return 0;
>   }
>   
> -static int mpc8xxx_wdt_remove(struct platform_device *ofdev)
> -{
> -	struct mpc8xxx_wdt_ddata *ddata = platform_get_drvdata(ofdev);
> -
> -	dev_crit(&ofdev->dev, "Watchdog removed, expect the %s soon!\n",
> -		 reset ? "reset" : "machine check exception");
> -	watchdog_unregister_device(&ddata->wdd);
> -
> -	return 0;
> -}
> -
>   static const struct of_device_id mpc8xxx_wdt_match[] = {
>   	{
>   		.compatible = "mpc83xx_wdt",
> @@ -259,7 +249,6 @@ MODULE_DEVICE_TABLE(of, mpc8xxx_wdt_match);
>   
>   static struct platform_driver mpc8xxx_wdt_driver = {
>   	.probe		= mpc8xxx_wdt_probe,
> -	.remove		= mpc8xxx_wdt_remove,
>   	.driver = {
>   		.name = "mpc8xxx_wdt",
>   		.of_match_table = mpc8xxx_wdt_match,
>