linux-kernel - Re: [PATCH 34/58] mmc: sdhci-of-aspeed: Convert to platform remove callback returning void

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Date:   Thu, 13 Jul 2023 11:13:58 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Yangtao Li <frank.li@...o.com>
Cc:     Andrew Jeffery <andrew@...id.au>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Joel Stanley <joel@....id.au>, linux-mmc@...r.kernel.org,
        linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 34/58] mmc: sdhci-of-aspeed: Convert to platform remove
 callback returning void

On Thu, Jul 13, 2023 at 04:07:43PM +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>
> ---
>  drivers/mmc/host/sdhci-of-aspeed.c | 15 +++++----------
>  1 file changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
> index 25b4073f698b..42d54532cabe 100644
> --- a/drivers/mmc/host/sdhci-of-aspeed.c
> +++ b/drivers/mmc/host/sdhci-of-aspeed.c
> @@ -450,22 +450,19 @@ static int aspeed_sdhci_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -static int aspeed_sdhci_remove(struct platform_device *pdev)
> +static void aspeed_sdhci_remove(struct platform_device *pdev)
>  {
>  	struct sdhci_pltfm_host *pltfm_host;
>  	struct sdhci_host *host;
> -	int dead = 0;
>  
>  	host = platform_get_drvdata(pdev);
>  	pltfm_host = sdhci_priv(host);
>  
> -	sdhci_remove_host(host, dead);
> +	sdhci_remove_host(host, 0);

Please mention additional cleanups in the commit log (or split them into
separate patches).

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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