Fix for one swiotlb regression in 2.16 from Takashi.
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@ -719,7 +719,7 @@ swiotlb_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle,
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goto out_warn;
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*dma_handle = __phys_to_dma(dev, phys_addr);
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if (dma_coherent_ok(dev, *dma_handle, size))
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if (!dma_coherent_ok(dev, *dma_handle, size))
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goto out_unmap;
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memset(phys_to_virt(phys_addr), 0, size);
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