On Thu, Jun 18, 2015 at 10:04:00AM +0100, Russell King - ARM Linux wrote: > > If dma_map_sg() coalesces scatterlist entries, then ret will be smaller > than src_nents, and ret indicates how many scatterlist entries to be > walked during DMA - you should not use src_nents for that. I couldn't > see where the driver used that information. In fact, the driver seems > to be capable of walking more than src_nents/ret numbers of scatterlist > entries: it just keeps going with sg_next() until it hits the end of > the allocated scatterlist. I think he should be OK even though he throws away the return value because he's stopping his walk once the sum of sg_dma_length reaches his end goal. Cheers, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
