linux-kernel - Re: [PATCH v2 26/61] mmc: sdhci-of-arasan: Convert to platform remove callback returning void

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Message-ID: <5ba4efe1-9328-5edc-889b-6e253152cb88@amd.com>
Date:   Thu, 27 Jul 2023 08:25:52 +0200
From:   Michal Simek <michal.simek@....com>
To:     Yangtao Li <frank.li@...o.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 26/61] mmc: sdhci-of-arasan: Convert to platform remove
 callback returning void



On 7/26/23 06:00, 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>
> ---
>   drivers/mmc/host/sdhci-of-arasan.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index 294dd605fd2b..160bab0c437c 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -2016,7 +2016,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>   	return ret;
>   }
>   
> -static int sdhci_arasan_remove(struct platform_device *pdev)
> +static void sdhci_arasan_remove(struct platform_device *pdev)
>   {
>   	struct sdhci_host *host = platform_get_drvdata(pdev);
>   	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -2034,8 +2034,6 @@ static int sdhci_arasan_remove(struct platform_device *pdev)
>   	sdhci_pltfm_unregister(pdev);
>   
>   	clk_disable_unprepare(clk_ahb);
> -
> -	return 0;
>   }
>   
>   static struct platform_driver sdhci_arasan_driver = {
> @@ -2046,7 +2044,7 @@ static struct platform_driver sdhci_arasan_driver = {
>   		.pm = &sdhci_arasan_dev_pm_ops,
>   	},
>   	.probe = sdhci_arasan_probe,
> -	.remove = sdhci_arasan_remove,
> +	.remove_new = sdhci_arasan_remove,
>   };
>   
>   module_platform_driver(sdhci_arasan_driver);

Acked-by: Michal Simek <michal.simek@....com>

Thanks,
Michal