netdev - Re: [NET-NEXT PATCH] e100: fix dma error in direction for mapping

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Date:	Mon, 17 Nov 2008 10:53:54 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	jeff@...zik.org, netdev@...r.kernel.org, davem@...emloft.net,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [NET-NEXT PATCH] e100: fix dma error in direction for mapping

On Fri, Nov 14, 2008 at 03:51:54PM -0800, Jeff Kirsher wrote:
> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
> 
> The e100 driver triggers BUG_ON(buf->direction != dir)
> by doing pci_map_single(..., PCI_DMA_BIDIRECTIONAL)
> and pci_dma_sync_single_for_device(..., PCI_DMA_TODEVICE).
> 
> Changing the DMA direction, especially with dmabounce will result
> in unexpected behaviour.
> 
> Reported-by: Anders Grafstrom <grfstrm@...rs.sourceforge.net>
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> CC: Russell King <linux@....linux.org.uk>

Acked-by: Russell King <rmk+kernel@....linux.org.uk>
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