[RFC 3/3] stk1160: Use non-coherent buffers for USB transfers
From: hch@infradead.org (Christoph Hellwig)
Date: 2018-08-30 17:59:40
Also in:
linux-media, linux-usb, lkml
+ 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.