From: "Brandeburg, Jesse" <redacted>
Date: Thu, 13 Nov 2008 17:21:50 -0800 (Pacific Standard Time)

On Fri, 31 Oct 2008, Russell King - ARM Linux wrote:

quoted

On Thu, Oct 30, 2008 at 05:27:59PM +0100, Anders Grafström wrote:

quoted

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).

I'm guessing it's allowed to do that and that something like
the patch below is called for?

No, it is not allowed to do that - that's why it's called "BUG_ON".
Changing the DMA direction, especially with dmabounce will result
in unexpected behaviour.

okay, how about this patch...  only compile tested as I couldn't get 
net-next-2.6 to boot on my test machine.  I'll get some testing done on 
this, but in the meantime....

e100: fix dma error in direction for mapping

From: Jesse Brandeburg <redacted>

FWIW this looks good to me.

Acked-by: David S. Miller <davem@davemloft.net>