linux-kernel - Re: [PATCH] ATHEROS-ALX: Use dma_set_mask_and

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Message-ID: <5324E8AD.6000206@cogentembedded.com>
Date:	Sun, 16 Mar 2014 02:56:29 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Peter Senna Tschudin <peter.senna@...il.com>, jcliburn@...il.com,
	chris.snook@...il.com, davem@...emloft.net,
	johannes@...solutions.net, jg1.han@...sung.com,
	wangyijing@...wei.com, linux@...njo.de, sd@...asysnail.net,
	hahnjo@...njo.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ATHEROS-ALX: Use dma_set_mask_and_coherent and fix a
 bug

Hello.

On 03/15/2014 09:19 PM, Peter Senna Tschudin wrote:

>   1. For the 64 bits dma mask use dma_set_mask_and_coherent instead of
>   dma_set_mask and dma_set_coherent_mask.

>   2. For the 32 bits dma mask dma_set_coherent_mask is only called if
>   dma_set_mask fails, which is unusual. Assuming this as a bug, fixes
>   it by replacing calls to dma_set_mask and dma_set_coherent_mask by a
>   call to dma_set_coherent_mask.

    You meant to say dma_set_mask_and_coherent() here?

>   Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
> ---

>   Tested by compilation only.

>   drivers/net/ethernet/atheros/alx/main.c | 14 ++++----------
>   1 file changed, 4 insertions(+), 10 deletions(-)

> diff --git a/drivers/net/ethernet/atheros/alx/main.c b/drivers/net/ethernet/atheros/alx/main.c
> index 2e45f6e..380d249 100644
> --- a/drivers/net/ethernet/atheros/alx/main.c
> +++ b/drivers/net/ethernet/atheros/alx/main.c
> @@ -1248,19 +1248,13 @@ static int alx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>   	 * shared register for the high 32 bits, so only a single, aligned,
>   	 * 4 GB physical address range can be used for descriptors.
>   	 */
> -	if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) &&
> -	    !dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
> +	if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
>   		dev_dbg(&pdev->dev, "DMA to 64-BIT addresses\n");
>   	} else {
> -		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
> +		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
>   		if (err) {
> -			err = dma_set_coherent_mask(&pdev->dev,
> -						    DMA_BIT_MASK(32));
> -			if (err) {
> -				dev_err(&pdev->dev,
> -					"No usable DMA config, aborting\n");
> -				goto out_pci_disable;
> -			}
> +			dev_err(&pdev->dev, "No usable DMA config, aborting\n");
> +			goto out_pci_disable;
>   		}
>   	}

WBR, Sergei


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