Russell King - ARM Linux writes:
> On Thu, Jul 30, 2015 at 09:02:15PM +0200, Robert Jarzmik wrote:
> Hmm.
>
> What happens if...
>
> n = dma_map_sg(dev, sg, nents, dir);
>
> where n < nents (which can happen if you have an IOMMU and it coalesces
> the entries)?
That's something I have not t
On Thu, Jul 30, 2015 at 09:02:15PM +0200, Robert Jarzmik wrote:
> Sometimes a scatter-gather has to be split into several chunks, or sub scatter
> lists. This happens for example if a scatter list will be handled by multiple
> DMA channels, each one filling a part of it.
>
> A concrete example com
Sometimes a scatter-gather has to be split into several chunks, or sub scatter
lists. This happens for example if a scatter list will be handled by multiple
DMA channels, each one filling a part of it.
A concrete example comes with the media V4L2 API, where the scatter list is
allocated from users
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