> >> + paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen, > >> + DMA_FROM_DEVICE); > > > > The device should be the device of the dma channel. > > The device is not visible on linux, DMA is done by the helper processor. > Perhaps you cah give me some idea how to do this. Thanks Well, that is a question for the DMA maintainers. But we can fix this later, I guess.
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