netdev - Re: [PATCH 6/7] NET: intel/ixgbe/ixgbe_main.c: fix 32-bit DMA mask handling

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Date:	Mon, 10 Jun 2013 16:28:14 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Russell King <rmk+kernel@....linux.org.uk>
Cc:	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Tushar Dave <tushar.n.dave@...el.com>,
	e1000-devel@...ts.sourceforge.net
Subject: Re: [PATCH 6/7] NET: intel/ixgbe/ixgbe_main.c: fix 32-bit DMA mask
 handling

On Tue, 2013-06-11 at 00:14 +0100, Russell King wrote:
> The fallback to 32-bit DMA mask is rather odd:
>         if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) &&
>             !dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
>                 pci_using_dac = 1;
>         } else {
>                 err = dma_set_mask(&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 configuration,
> aborting\n");
>                                 goto err_dma;
>                         }
>                 }
>                 pci_using_dac = 0;
>         }
> This means we only set the coherent DMA mask in the fallback path if
> the DMA mask set failed, which is silly.  This fixes it to set the
> coherent DMA mask only if dma_set_mask() succeeded, and to error out
> if either fails.
> 
> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |   11 +++++------
>  1 files changed, 5 insertions(+), 6 deletions(-) 

Thanks Russell, I will add this to my queue.

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