netdev - Re: [PATCH net-next 1/6] ethernet: wiznet: remove unnecessary check

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Date:	Wed, 22 Oct 2014 15:43:50 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Varka Bhadram <varkabhadram@...il.com>, netdev@...r.kernel.org
CC:	Varka Bhadram <varkab@...c.in>
Subject: Re: [PATCH net-next 1/6] ethernet: wiznet: remove unnecessary check

Hello.

On 10/22/2014 8:16 AM, Varka Bhadram wrote:

> devm_ioremap_resource checks platform_get_resource() return value.
> We can remove the duplicate check here.

> Signed-off-by: Varka Bhadram <varkab@...c.in>
> ---
>   drivers/net/ethernet/wiznet/w5100.c |    3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)

> diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
> index 0f56b1c..bf195e3 100644
> --- a/drivers/net/ethernet/wiznet/w5100.c
> +++ b/drivers/net/ethernet/wiznet/w5100.c
> @@ -638,8 +638,7 @@ static int w5100_hw_probe(struct platform_device *pdev)
>   	}
>
>   	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!mem)
> -		return -ENXIO;
> +
>   	mem_size = resource_size(mem);

    This would cause a NULL dereference on resource_size() call if 'mem' is 
NULL. You can't remove the NULL check because of that.

>
>   	priv->base = devm_ioremap_resource(&pdev->dev, mem);
>

WBR, Sergei

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