swiotlb-xen: simplify the DMA sync method implementations
Get rid of the grand multiplexer and implement the sync_single_for_cpu and sync_single_for_device methods directly, and then loop over them for the scatterlist based variants. Note that this also loses a few comments related to highlevel DMA API concepts, which have nothing to do with the swiotlb-xen implementation details. Reviewed-by:Stefano Stabellini <sstabellini@kernel.org> Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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