Problems with dma_alloc_coherent()

[John Whitney]

> I think we should use "device" parameter passed to DMA API for such
> stuff, it
> already has a member "struct bus_type* bus".
>

This effectively makes the DMA API a superset of the PCI DMA API (the
DMA API would recognize a PCI device, and handle it accordingly)?  It
sounds like a good solution to me, although I'd like to see the
"device" structure get that DMA offset I mentioned, so the DMA API
wouldn't have to have a special case for each new bus-type added (PLB,
PCI, OCP, CPM, whatever), as it does now for PCI vs. non-PCI.  (That
assumes bus offset is the only difference that needs to be handled...)


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