linux-kernel - Re: [PATCH 1/7] mmc: sdhci-pltfm: bail out if register resource is too small

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Date:	Tue, 19 Apr 2016 14:32:36 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	linux-mmc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH 1/7] mmc: sdhci-pltfm: bail out if register resource is
 too small

On 14/04/16 05:29, Masahiro Yamada wrote:
> This code checks the resource size and displays an error message if
> it is too small, but still moves forward.  Let is fail in that case.

is -> it

How do you know there aren't drivers that actually have a smaller size?

One that might not is sdhci-dove which appears to sidestep some registers in
sdhci_dove_readw().


> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
>  drivers/mmc/host/sdhci-pltfm.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
> index 072bb27..7d12203 100644
> --- a/drivers/mmc/host/sdhci-pltfm.c
> +++ b/drivers/mmc/host/sdhci-pltfm.c
> @@ -127,8 +127,11 @@ struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
>  		goto err;
>  	}
>  
> -	if (resource_size(iomem) < 0x100)
> +	if (resource_size(iomem) < 0x100) {
>  		dev_err(&pdev->dev, "Invalid iomem size!\n");
> +		ret = -EINVAL;
> +		goto err;
> +	}
>  
>  	host = sdhci_alloc_host(&pdev->dev,
>  		sizeof(struct sdhci_pltfm_host) + priv_size);
>