Generic dma-coherent: fix DMA_MEMORY_EXCLUSIVE
Don't rewrite successfull allocation return values in case the memory was marked with DMA_MEMORY_EXCLUSIVE. Signed-off-by: NDmitry Baryshkov <dbaryshkov@gmail.com> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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