[PATCH RFCv2 1/2] dmaengine: add support for scatterlist to scatterlist transfers

Per Förlin per.friden at stericsson.com
Tue Sep 28 17:13:35 EST 2010

> On Mon, Sep 27, 2010 at 05:23:34PM +0200, Linus Walleij wrote:
>> 2010/9/25 Ira W. Snyder <iws at ovro.caltech.edu>:
>>> This adds support for scatterlist to scatterlist DMA transfers.
>> This is a good idea, we have a local function to do this in DMA40 already,
>> stedma40_memcpy_sg().
> I think that having two devices that want to implement this
> functionality as part of the DMAEngine API is a good argument for making
> it available as part of the core API. I think it would be good to add
> this to struct dma_device, and add a capability (DMA_SG?) for it as
> well.
> I have looked at the stedma40_memcpy_sg() function, and I think we would
> want to extend it slightly for the generic API. Is there any good reason
> to prohibit scatterlists with different numbers of elements?


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