linux-kernel - Re: [PATCH 16/58] mmc: rtsx_pci: Convert to platform remove callback returning void

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Date:   Thu, 13 Jul 2023 11:06:31 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Yangtao Li <frank.li@...o.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/58] mmc: rtsx_pci: Convert to platform remove callback
 returning void

On Thu, Jul 13, 2023 at 04:07:25PM +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/rtsx_pci_sdmmc.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
> index 8098726dcc0b..5465a7225df4 100644
> --- a/drivers/mmc/host/rtsx_pci_sdmmc.c
> +++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
> @@ -1523,14 +1523,14 @@ static int rtsx_pci_sdmmc_drv_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev)
> +static void rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev)
>  {
>  	struct realtek_pci_sdmmc *host = platform_get_drvdata(pdev);
>  	struct rtsx_pcr *pcr;
>  	struct mmc_host *mmc;
>  
>  	if (!host)
> -		return 0;
> +		return;

If host is NULL, there is a problem. While sometimes (rarely) driver
maintainers object, I usually remove these, see for example
3d82dca0f27ac5a0bfbbce439bba5c6452f3b7da.
 
>  	pcr = host->pcr;
>  	pcr->slots[RTSX_SD_CARD].p_dev = NULL;

Best regards
Uwe

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

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