linux-kernel - Re: [PATCH v2 05/61] mmc: mtk-sd: Convert to platform remove callback returning void

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Message-ID: <479e4e09-899a-63a0-e606-40427bdd6cf8@collabora.com>
Date:   Wed, 26 Jul 2023 10:26:48 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yangtao Li <frank.li@...o.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 05/61] mmc: mtk-sd: Convert to platform remove callback
 returning void

Il 26/07/23 05:59, Yangtao Li ha scritto:
> 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: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

> ---
>   drivers/mmc/host/mtk-sd.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 02403ff99e0d..9e2debd1edbe 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -2887,7 +2887,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
>   	return ret;
>   }
>   
> -static int msdc_drv_remove(struct platform_device *pdev)
> +static void msdc_drv_remove(struct platform_device *pdev)
>   {
>   	struct mmc_host *mmc;
>   	struct msdc_host *host;
> @@ -2911,8 +2911,6 @@ static int msdc_drv_remove(struct platform_device *pdev)
>   			host->dma.bd, host->dma.bd_addr);
>   
>   	mmc_free_host(mmc);
> -
> -	return 0;
>   }
>   
>   static void msdc_save_reg(struct msdc_host *host)
> @@ -3054,7 +3052,7 @@ static const struct dev_pm_ops msdc_dev_pm_ops = {
>   
>   static struct platform_driver mt_msdc_driver = {
>   	.probe = msdc_drv_probe,
> -	.remove = msdc_drv_remove,
> +	.remove_new = msdc_drv_remove,
>   	.driver = {
>   		.name = "mtk-msdc",
>   		.probe_type = PROBE_PREFER_ASYNCHRONOUS,