linux-kernel - Re: [PATCH v2] mmc: sdhci-of-esdhc: Check for error num after setting mask

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Date:   Wed, 12 Jan 2022 11:10:18 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mmc: sdhci-of-esdhc: Check for error num after setting
 mask

On 12/01/2022 10:31, Jiasheng Jiang wrote:
> Because of the possible failure of the dma_supported(), the
> dma_set_mask_and_coherent() may return error num.
> Therefore, it should be better to check it and return the error if
> fails.
> And since the sdhci_setup_host() has already checked the return value of
> the enable_dma, we need not check it in sdhci_resume_host() again.
> 
> Fixes: 5552d7ad596c ("mmc: sdhci-of-esdhc: set proper dma mask for ls104x chips")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
> Changelog
> 
> v1 -> v2
> 
> * Change 1. Remove the change of esdhc_of_resume and refine the commit
> * message.
> ---
>  drivers/mmc/host/sdhci-of-esdhc.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
> index a593b1fbd69e..0f3658b36513 100644
> --- a/drivers/mmc/host/sdhci-of-esdhc.c
> +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> @@ -524,12 +524,16 @@ static void esdhc_of_adma_workaround(struct sdhci_host *host, u32 intmask)
>  
>  static int esdhc_of_enable_dma(struct sdhci_host *host)
>  {
> +	int ret;
>  	u32 value;
>  	struct device *dev = mmc_dev(host->mmc);
>  
>  	if (of_device_is_compatible(dev->of_node, "fsl,ls1043a-esdhc") ||
> -	    of_device_is_compatible(dev->of_node, "fsl,ls1046a-esdhc"))
> -		dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
> +	    of_device_is_compatible(dev->of_node, "fsl,ls1046a-esdhc")) {
> +		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
> +		if (ret)
> +			return ret;
> +	}
>  
>  	value = sdhci_readl(host, ESDHC_DMA_SYSCTL);
>  
>