dma_alloc_coherent
ih->ring = dma_alloc_coherent(adev->dev, ih->ring_size + 8,
dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL);
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
return dma_alloc_coherent(&pdev->dev, size, dma_handle, GFP_ATOMIC);