x86/calgary: remove the mapping_error dma_map_ops method
Return DMA_MAPPING_ERROR instead of the magic bad_dma_addr on a dma mapping failure and let the core dma-mapping code handle the rest. Remove the magic EMERGENCY_PAGES that the bad_dma_addr gets redirected to. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
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