Maciej W. Rozycki d01501f852 MIPS: Fix `dma_alloc_coherent' returning a non-coherent allocation ... Fix a MIPS `dma_alloc_coherent' regression from commit bc3ec75de5 ("dma-mapping: merge direct and noncoherent ops") that causes a cached allocation to be returned on noncoherent cache systems. This is due to an inverted check now used in the MIPS implementation of `arch_dma_alloc' on the result from `dma_direct_alloc_pages' before doing the cached-to-uncached mapping of the allocation address obtained. The mapping has to be done for a non-NULL rather than NULL result, because a NULL result means the allocation has failed. Invert the check for correct operation then. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Paul Burton <paul.burton@mips.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Fixes: bc3ec75de5 ("dma-mapping: merge direct and noncoherent ops") Patchwork: https://patchwork.linux-mips.org/patch/20965/		2018-11-05 10:08:13 -08:00
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