linux-kernel - Re: [PATCH] enic: Use dma_set_mask_and

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Message-ID: <86bf852e-4220-52d4-259d-3455bc24def1@wanadoo.fr>
Date:   Wed, 5 Jan 2022 20:51:42 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     benve@...co.com, govind@....com, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] enic: Use dma_set_mask_and_coherent()

Le 03/01/2022 à 09:47, Christoph Hellwig a écrit :
> On Sat, Jan 01, 2022 at 03:02:45PM +0100, Christophe JAILLET wrote:
>> -	err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(47));
>> +	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(47));
>>   	if (err) {
>> +		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
>>   		if (err) {
>>   			dev_err(dev, "No usable DMA configuration, aborting\n");
>>   			goto err_out_release_regions;
>>   		}
>>   	} else {
>>   		using_dac = 1;
> 
> There is no need for the callback.  All the routines to set a DMA mask
> will only fail if the passed in mask is too small, but never if it is
> larger than what is supported.  Also the using_dac variable is not
> needed, NETIF_F_HIGHDMA can and should be set unconditionally.
> 

Ok, thanks.
I was only aware of the 64 bits case.
The patch has already reached -next.

I'll send another patch on to of it to go one step further.

CJ