On Tuesday 07 January 2014, Yao Yuan wrote: > Thanks for your suggestion. It's important for me. > > I read the source code for dma_map_single again. I found that both of them(as first argument is > dma or uart) worked well. But in my code I found that the *sport->port.dev->dma_mask is not > zero. By contrast the dma_mask for dma device is zero. Ah, it seems you found two more bugs then ;-) > You are right. There should be dma device. But I also have a doubt here. Why I find many other > driver use the first argument here rather than the dma device pointer. It's a common mistake. Most other linux device driver interfaces require you to pass the device you are working on, so it's understandable why people come to the wrong conclusion here. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
