[PATCH 06/51] DMA-API: net: intel/ixgb: fix 32-bit DMA mask handling

Jeff Kirsher jeffrey.t.kirsher at intel.com
Fri Sep 20 19:50:20 UTC 2013


On Thu, 2013-09-19 at 22:30 +0100, Russell King wrote:
> The fallback to 32-bit DMA mask is rather odd:
>         err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
>         if (!err) {
>                 err = dma_set_coherent_mask(&pdev->dev,
> DMA_BIT_MASK(64));
>                 if (!err)
>                         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) {
>                                 pr_err("No usable DMA configuration,
> aborting\n");
>                                 goto err_dma_mask;
>                         }
>                 }
>         }
> 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 at arm.linux.org.uk>
> ---
>  drivers/net/ethernet/intel/ixgb/ixgb_main.c |   16 +++++-----------
>  1 files changed, 5 insertions(+), 11 deletions(-)

Acked-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
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