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Hi everyone, Thank for your time, I'm new to linux kernel. I am reading LDD3 chapter 15, Dirrect Memory Access section. I see that when I call function dma_map_single and dma_unmap_single, I need to pass a direction as a parameter. I wonder what is purpose of it? Does It relate to something like permission? Can I call dma_map_single with DMA_BIDIRECTIONAL and then call dma_unmap_single with DMA_TO_DEVICE? Will it cause any problem? Thank you very much.
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