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Date: Thu, 30 Aug 2018 10:59:37 -0700 From: Christoph Hellwig <hch@...radead.org> To: Ezequiel Garcia <ezequiel@...labora.com> Cc: linux-media@...r.kernel.org, linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Laurent Pinchart <laurent.pinchart@...asonboard.com>, Tomasz Figa <tfiga@...omium.org>, "Matwey V . Kornilov" <matwey@....msu.ru>, Alan Stern <stern@...land.harvard.edu>, kernel@...labora.com, Keiichi Watanabe <keiichiw@...omium.org> Subject: Re: [RFC 3/3] stk1160: Use non-coherent buffers for USB transfers > + 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.
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