dma_free_coherent
dma_free_coherent(adev->dev, ih->ring_size + 8,
dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
dma_free_coherent(&pdev->dev, size, vaddr, dma_handle);
dma_free_coherent(pool->dev, pool->size, (void *)d_page->vaddr, dma);