Marek, >It looks that You have simplified arm_iommu_map_sg() function too much. >The main advantage of the iommu is to map scattered memory pages into >contiguous dma address space. DMA-mapping is allowed to merge consecutive >entries in the scatter list if hardware supports that. >http://article.gmane.org/gmane.linux.kernel/1128416 I would update arm_iommu_map_sg() back to coalesce the sg list. >I'm not sure if mmc drivers are aware of coalescing the SG entries together. >If not the code must be updated to use dma_sg_len() and the dma entries >number returned from dma_map_sg() call. MMC drivers seem to be aware of coalescing the SG entries together as they are using dma_sg_len(). Let me test and update the patch. -- nvpublic -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href