linux-kernel - Re: [PATCH v2 46/61] mmc: atmel-mci: Convert to platform remove callback returning void

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Message-ID: <7a8e07cf-2995-0018-b658-91a37457f05b@tuxon.dev>
Date:   Thu, 27 Jul 2023 08:41:26 +0300
From:   claudiu beznea <claudiu.beznea@...on.dev>
To:     Yangtao Li <frank.li@...o.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 46/61] mmc: atmel-mci: Convert to platform remove
 callback returning void



On 26.07.2023 07:00, 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: Claudiu Beznea <claudiu.beznea@...on.dev>

> ---
>   drivers/mmc/host/atmel-mci.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index dd18440a90c5..b4ae9aa939a5 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -2600,7 +2600,7 @@ static int atmci_probe(struct platform_device *pdev)
>   	return ret;
>   }
>   
> -static int atmci_remove(struct platform_device *pdev)
> +static void atmci_remove(struct platform_device *pdev)
>   {
>   	struct atmel_mci	*host = platform_get_drvdata(pdev);
>   	unsigned int		i;
> @@ -2630,8 +2630,6 @@ static int atmci_remove(struct platform_device *pdev)
>   
>   	pm_runtime_disable(&pdev->dev);
>   	pm_runtime_put_noidle(&pdev->dev);
> -
> -	return 0;
>   }
>   
>   #ifdef CONFIG_PM
> @@ -2664,7 +2662,7 @@ static const struct dev_pm_ops atmci_dev_pm_ops = {
>   
>   static struct platform_driver atmci_driver = {
>   	.probe		= atmci_probe,
> -	.remove		= atmci_remove,
> +	.remove_new	= atmci_remove,
>   	.driver		= {
>   		.name		= "atmel_mci",
>   		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,