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    SubjectRe: [PATCH 2/2 v2] Blackfin: fix dma-mapping build errors
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    On Tuesday 23 June 2009, Mike Frysinger wrote:

    > +static inline void dma_sync_sg_for_device(struct device *dev,
    > + struct scatterlist *sg,
    > + int nents, enum dma_data_direction dir)
    > +{
    > +}

    If you flush the dcache in dma_map_sg, you probably also need to
    flush it in dma_sync_*_for_device:

    static inline void
    dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
    int nents, enum dma_data_direction direction)
    {
    struct scatterlist *sg;
    int i;

    for_each_sg(sglist, sg, nents, i)
    invalidate_dcache_range(sg_virt(sg), sg_virt(sg) + sg->length);
    }

    Arnd <><


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