On Thu, May 12, 2016 at 12:39:35AM +0900, Akinobu Mita wrote: > I realized that this undo patch has not been merged to Linus' tree yet. > I have a fix for this issue (attached patch). But the change is not > small and also v4.6 release is soon. So I think this undo patch > should go into 4.6 release. I actually just sent that a few minutes ago anyway. > The actual DMA transfer length by dmaengine can be smaller than SPI > transfer length in the specific condition. In that case, the last > word needs to be filled after DMA transfer completion. > This fixes it by detecting that case and remap the scatterlist with > correct DMA transfer length. This feels like it should be in the framework, I imagine other devices will have similar limiations. Especially if the limitation comes from the DMA engine I'd hope we can arrange to query it somehow... can you provide a bit more detail on what the restriction is please?
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