linux-kernel - Re: [PATCH 40/58] mmc: sdhci-msm: Convert to platform remove callback returning void

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Date:   Thu, 13 Jul 2023 10:44:30 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Yangtao Li <frank.li@...o.com>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        linux-arm-msm@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 40/58] mmc: sdhci-msm: Convert to platform remove callback
 returning void

On 13.07.2023 10:07, 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>
> ---
Acked-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad

>  drivers/mmc/host/sdhci-msm.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 1c935b5bafe1..80e376802ee0 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -2668,7 +2668,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -static int sdhci_msm_remove(struct platform_device *pdev)
> +static void sdhci_msm_remove(struct platform_device *pdev)
>  {
>  	struct sdhci_host *host = platform_get_drvdata(pdev);
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -2687,7 +2687,6 @@ static int sdhci_msm_remove(struct platform_device *pdev)
>  	if (!IS_ERR(msm_host->bus_clk))
>  		clk_disable_unprepare(msm_host->bus_clk);
>  	sdhci_pltfm_free(pdev);
> -	return 0;
>  }
>  
>  static __maybe_unused int sdhci_msm_runtime_suspend(struct device *dev)
> @@ -2740,7 +2739,7 @@ static const struct dev_pm_ops sdhci_msm_pm_ops = {
>  
>  static struct platform_driver sdhci_msm_driver = {
>  	.probe = sdhci_msm_probe,
> -	.remove = sdhci_msm_remove,
> +	.remove_new = sdhci_msm_remove,
>  	.driver = {
>  		   .name = "sdhci_msm",
>  		   .of_match_table = sdhci_msm_dt_match,