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The buffers mapped by the PCI GART can be written to by the device,
not just read.
For example, this happens via the RB_RPTR writeback on Radeon.
So we can't use PCI_DMA_TODEVICE else we'll get protection faults
on IOMMU platforms.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
296c6ae0e9