Grant> Yes. "0" is a valid DMA address. no portable PCI driver
Grant> should be expecting 0 for a failure. ppc64 can return
Grant> anything it likes. Many arches (including parisc, alpha,
Grant> sparc) would just panic when the DMA pool was exhausted.
But dma_map_sg() isn't returning a DMA address -- it's returning the
number of entries in the sg list it used to do the mapping. So 0
indicates an error, and there's no need to scan through the whole
returned list for a bad address.
- R.
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