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    SubjectRe: How is dmaengine_prep_slave_single supposed to be used?
    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


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