[PATCH v4 12/14] v4l: vb2-dma-contig: change map/unmap behaviour for importers

Laurent Pinchart laurent.pinchart at ideasonboard.com
Mon Apr 16 18:03:37 PDT 2012

Hi Tomasz,

Thanks for the patch.

On Friday 13 April 2012 17:47:54 Tomasz Stanislawski wrote:
> The DMABUF documentation says that the map_dma_buf callback should return
> scatterlist that is mapped into a caller's address space. In practice,
> almost none of existing implementations of DMABUF exporter does it.  This
> patch breaks the DMABUF specification in order to allow exchange DMABUF
> buffers between other APIs like DRM.

Once again, this means that it's time to either fix the documentation or fix 
the non-compliant drivers.

Could you please read the mail I've sent on 27/03/2012 in the "Minutes from 
V4L2 update call" thread and reply there to avoid scattering the discussion ?


Laurent Pinchart

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