On Fri, Jul 11, 2014 at 05:56:21PM +0200, Geert Uytterhoeven wrote: > Signed-off-by: Geert Uytterhoeven <[email protected]> > --- > v2: > - New > --- > Documentation/dmaengine.txt | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/Documentation/dmaengine.txt b/Documentation/dmaengine.txt > index 879b6e31e2da..87d3f192e160 100644 > --- a/Documentation/dmaengine.txt > +++ b/Documentation/dmaengine.txt > @@ -100,8 +100,10 @@ The slave DMA usage consists of following steps: > 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. > - The scatterlist must be mapped using the DMA struct device. So, > - normal setup should look like this: > + The scatterlist must be mapped using the DMA struct device. > + If a mapping needs to be synchronized later, dma_sync_*_for_*() must be > + called using the DMA struct device, too. > + So, normal setup should look like this: > > nr_sg = dma_map_sg(chan->device->dev, sgl, sg_len); > if (nr_sg == 0) > -- > 1.9.1 > Applied, thanks
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