linux-kernel - Re: [PATCH 2/2] ethernet: lpc_eth: Use NULL to compare with pointer-typed value rather than 0

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Date:   Fri, 17 Aug 2018 18:29:01 +0300
From:   Vladimir Zapolskiy <vz@...ia.com>
To:     zhong jiang <zhongjiang@...wei.com>, davem@...emloft.net
Cc:     slemieux.tyco@...il.com, keescook@...omium.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ethernet: lpc_eth: Use NULL to compare with
 pointer-typed value rather than 0

Hi zhong jiang,

On 08/17/2018 04:18 PM, zhong jiang wrote:
> We should use NULL to compare with pointer-typed value rather than 0.
> The issue is detected with the help of Coccinelle.
> ---
>  drivers/net/ethernet/nxp/lpc_eth.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
> index 08381ef..04d9e62 100644
> --- a/drivers/net/ethernet/nxp/lpc_eth.c
> +++ b/drivers/net/ethernet/nxp/lpc_eth.c
> @@ -1350,7 +1350,7 @@ static int lpc_eth_drv_probe(struct platform_device *pdev)
>  				"IRAM not big enough for net buffers, using SDRAM instead.\n");
>  	}
>  
> -	if (pldat->dma_buff_base_v == 0) {
> +	if (pldat->dma_buff_base_v == NULL) {

That's a valid finding, but please use a common 0 and NULL comparison in form of

	if (!pldat->dma_buff_base_v)

To the change above please feel free to add my

Acked-by: Vladimir Zapolskiy <vz@...ia.com>

>  		ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
>  		if (ret)
>  			goto err_out_free_irq;
>