On Fri, Aug 31, 2018 at 2:59 AM Christoph Hellwig wrote:
>
> > + dma_sync_single_for_cpu(&urb->dev->dev, urb->transfer_dma,
> > + urb->transfer_buffer_length, DMA_FROM_DEVICE);
>
> You can't ue dma_sync_single_for_cpu on non-coherent dma buffers,
> which is one of the major issues
> + dma_sync_single_for_cpu(&urb->dev->dev, urb->transfer_dma,
> + urb->transfer_buffer_length, DMA_FROM_DEVICE);
You can't ue dma_sync_single_for_cpu on non-coherent dma buffers,
which is one of the major issues with them.
