lkpi_dma_unmap
void lkpi_dma_unmap(struct device *, dma_addr_t, size_t,
lkpi_dma_unmap(dev, dma_addr, size, DMA_BIDIRECTIONAL, 0);
lkpi_dma_unmap(dev, dma_address, size, direction, 0);
lkpi_dma_unmap(dev, dma, size, direction, attrs);
lkpi_dma_unmap(dev, dma, size, direction, attrs);
lkpi_dma_unmap(dev, dma_addr, len, DMA_NONE, 0);