Re: [PATCH v5 2/2] media: usb: pwc: Don't use coherent DMA buffers for ISO transfer

[Christoph Hellwig]

On Wed, Dec 12, 2018 at 05:57:02PM +0900, Tomasz Figa wrote:
> How about dma_sync_sg_*()? I'd expect some drivers to export/import
> such memory via sg, since that's the typical way of describing memory
> in DMA-buf.

The way it is implemented dma_sync_sg_* would just work, however there
really should be no need to have sglists for buffers created by this
API.

> Sounds good to me. Thanks for working on this. I'd be happy to be on
> CC and help with review when you post the patches later.

The patches were already posted here:

https://lists.linuxfoundation.org/pipermail/iommu/2018-December/031982.html