linux-kernel - Re: [RFC RESEND PATCH v2 8/8] watchdog: retu_wdt: Clean-up by using managed work init

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Date:   Mon, 22 Mar 2021 07:05:45 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-watchdog@...r.kernel.org
Subject: Re: [RFC RESEND PATCH v2 8/8] watchdog: retu_wdt: Clean-up by using
 managed work init

On Mon, Mar 22, 2021 at 09:38:37AM +0200, Matti Vaittinen wrote:
> Few drivers implement remove call-back only for ensuring a delayed
> work gets cancelled prior driver removal. Clean-up these by switching
> to use devm_delayed_work_autocancel() instead.
> 
> This change is compile-tested only. All testing is appreciated.
> 
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>

Acked-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/retu_wdt.c | 22 ++++++----------------
>  1 file changed, 6 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/watchdog/retu_wdt.c b/drivers/watchdog/retu_wdt.c
> index 258dfcf9cbda..2b9017e1cd91 100644
> --- a/drivers/watchdog/retu_wdt.c
> +++ b/drivers/watchdog/retu_wdt.c
> @@ -8,6 +8,7 @@
>   * Rewritten by Aaro Koskinen.
>   */
>  
> +#include <linux/devm-helpers.h>
>  #include <linux/slab.h>
>  #include <linux/errno.h>
>  #include <linux/device.h>
> @@ -127,9 +128,12 @@ static int retu_wdt_probe(struct platform_device *pdev)
>  	wdev->rdev		= rdev;
>  	wdev->dev		= &pdev->dev;
>  
> -	INIT_DELAYED_WORK(&wdev->ping_work, retu_wdt_ping_work);
> +	ret = devm_delayed_work_autocancel(&pdev->dev, &wdev->ping_work,
> +					   retu_wdt_ping_work);
> +	if (ret)
> +		return ret;
>  
> -	ret = watchdog_register_device(retu_wdt);
> +	ret = devm_watchdog_register_device(&pdev->dev, retu_wdt);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -138,25 +142,11 @@ static int retu_wdt_probe(struct platform_device *pdev)
>  	else
>  		retu_wdt_ping_enable(wdev);
>  
> -	platform_set_drvdata(pdev, retu_wdt);
> -
> -	return 0;
> -}
> -
> -static int retu_wdt_remove(struct platform_device *pdev)
> -{
> -	struct watchdog_device *wdog = platform_get_drvdata(pdev);
> -	struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
> -
> -	watchdog_unregister_device(wdog);
> -	cancel_delayed_work_sync(&wdev->ping_work);
> -
>  	return 0;
>  }
>  
>  static struct platform_driver retu_wdt_driver = {
>  	.probe		= retu_wdt_probe,
> -	.remove		= retu_wdt_remove,
>  	.driver		= {
>  		.name	= "retu-wdt",
>  	},
> -- 
> 2.25.4
> 
> 
> -- 
> Matti Vaittinen, Linux device drivers
> ROHM Semiconductors, Finland SWDC
> Kiviharjunlenkki 1E
> 90220 OULU
> FINLAND
> 
> ~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
> Simon says - in Latin please.
> ~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
> Thanks to Simon Glass for the translation =]