netdev - Re: [RFC 0/7] Fixing dma mask setting in various network drivers

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Message-ID: <20130617140145.GH2718@n2100.arm.linux.org.uk>
Date:	Mon, 17 Jun 2013 15:01:45 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc:	Alex Duyck <alexander.h.duyck@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Greg Rose <gregory.v.rose@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	John Ronciak <john.ronciak@...el.com>, netdev@...r.kernel.org,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Rasesh Mody <rmody@...cade.com>,
	Tushar Dave <tushar.n.dave@...el.com>
Subject: Re: [RFC 0/7] Fixing dma mask setting in various network drivers

On Tue, Jun 11, 2013 at 11:12:30AM -0700, Jesse Brandeburg wrote:
> This is my proposed change to the intel drivers.  Comments?
> 
> +	if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
> +		pci_using_dac = true;
> +		/* coherent mask for the same size will always succeed if
> +		 * dma_set_mask does
> +		 */
> +		dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
> +	} else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
> +		pci_using_dac = false;
> +		dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +	} else {
> +		dev_err(&pdev->dev, "%s: DMA configuration failed: %d\n",
> +			 __func__, err);
> +		err = -EIO;
> +		goto err_dma;
>  	}
> 

So, will you be going with this change rather than mine, which apparantly
Jeff queued?  Please let me know what you decide so I can keep my private
git tree in sync with what you've decided to avoid conflicting with
further dma-mask changes which I'm working on.

Thanks.
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