c6x: dma_debug: add debug_dma_mapping_error support
Add dma-debug interface debug_dma_mapping_error() to debug drivers that fail to check dma mapping errors on addresses returned by dma_map_single() and dma_map_page() interfaces. Signed-off-by: NShuah Khan <shuah.khan@hp.com> Acked-by: NMark Salter <msalter@redhat.com> Signed-off-by: NJoerg Roedel <joro@8bytes.org>
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