linux-kernel - Re: [PATCH 21/27] thermal/drivers/rcar_thermal: Convert to platform remove callback returning void

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Message-ID: <ZK6pOIET7MnkkP-d@oden.dyn.berto.se>
Date:   Wed, 12 Jul 2023 15:23:04 +0200
From:   Niklas Söderlund <niklas.soderlund@...natech.se>
To:     Yangtao Li <frank.li@...o.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        linux-renesas-soc@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 21/27] thermal/drivers/rcar_thermal: Convert to platform
 remove callback returning void

On 2023-07-12 16:12:52 +0800, Yangtao Li wrote:
> The .remove() callback for a platform driver returns an int which makes
> many driver authors wrongly assume it's possible to do error handling by
> returning an error code. However the value returned is (mostly) ignored
> and this typically results in resource leaks. To improve here there is a
> quest to make the remove callback return void. In the first step of this
> quest all drivers are converted to .remove_new() which already returns
> void.
> 
> Trivially convert this driver from always returning zero in the remove
> callback to the void returning variant.
> 
> Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Signed-off-by: Yangtao Li <frank.li@...o.com>

Reviewed-by: Niklas Söderlund <niklas.soderlund@...natech.se>

> ---
>  drivers/thermal/rcar_thermal.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
> index b8571f7090aa..b4c58c5f6f6d 100644
> --- a/drivers/thermal/rcar_thermal.c
> +++ b/drivers/thermal/rcar_thermal.c
> @@ -371,7 +371,7 @@ static irqreturn_t rcar_thermal_irq(int irq, void *data)
>  /*
>   *		platform functions
>   */
> -static int rcar_thermal_remove(struct platform_device *pdev)
> +static void rcar_thermal_remove(struct platform_device *pdev)
>  {
>  	struct rcar_thermal_common *common = platform_get_drvdata(pdev);
>  	struct device *dev = &pdev->dev;
> @@ -388,8 +388,6 @@ static int rcar_thermal_remove(struct platform_device *pdev)
>  
>  	pm_runtime_put(dev);
>  	pm_runtime_disable(dev);
> -
> -	return 0;
>  }
>  
>  static int rcar_thermal_probe(struct platform_device *pdev)
> @@ -581,7 +579,7 @@ static struct platform_driver rcar_thermal_driver = {
>  		.of_match_table = rcar_thermal_dt_ids,
>  	},
>  	.probe		= rcar_thermal_probe,
> -	.remove		= rcar_thermal_remove,
> +	.remove_new	= rcar_thermal_remove,
>  };
>  module_platform_driver(rcar_thermal_driver);
>  
> -- 
> 2.39.0
> 

-- 
Kind Regards,
Niklas Söderlund