void arch_sync_dma_for_device()

in mm/dma-mapping.c [21:43]

• 18 lines of code
• 4 McCabe index (conditional complexity)

void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
		enum dma_data_direction dir)
{
	void *vaddr = phys_to_virt(paddr);

	switch (dir) {
	case DMA_FROM_DEVICE:
		invalidate_dcache_range((unsigned long)vaddr,
			(unsigned long)(vaddr + size));
		break;
	case DMA_TO_DEVICE:
		/*
		 * We just need to flush the caches here , but Nios2 flush
		 * instruction will do both writeback and invalidate.
		 */
	case DMA_BIDIRECTIONAL: /* flush and invalidate */
		flush_dcache_range((unsigned long)vaddr,
			(unsigned long)(vaddr + size));
		break;
	default:
		BUG();
	}
}