Re: How is dmaengine_prep_slave_single supposed to be used?

[Vinod Koul]

On Fri, 2012-01-27 at 15:32 +0100, Lars-Peter Clausen wrote:
> Hi,
> 
> I've tried using dmaengine_prep_slave_single in one of my drivers an run
> into an issue, the dma_address attribute of the sg element is not
> initialized and thus the dma transfer and the DMA transfer fails.
> 
> Quoting from Documentation/dmaengine.txt:
> 
>    The peripheral driver is expected to have mapped the scatterlist for
>    the DMA operation prior to calling device_prep_slave_sg, and must
>    keep the scatterlist mapped until the DMA operation has completed.
> 
> So this is clearly not the case with dmaengine_prep_slave_single, so I'm
> wondering how is ut supposed to be used and can it work properly at all?
> 
Yes this is broken now, I will fix this up

-- 
~Vinod

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