Hi, The following change fixes a bug, which causes releasing incorrect iova space, in the original patch of this mail thread. It fixes compilation error either.

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 82d5134..8c16ed7 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -900,10 +900,8 @@ static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t si unsigned int count = size >> PAGE_SHIFT; int i;

- for (i=0; i<count; i++) { - iommu_unmap(mapping->domain, iova, 0); - iova += PAGE_SIZE; - } + for (i=0; i<count; i++) + iommu_unmap(mapping->domain, iova + i * PAGE_SIZE, 0); __free_iova(mapping, iova, size); return 0; } @@ -1073,7 +1071,7 @@ int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents, size += sg->length; } __map_sg_chunk(dev, start, size, &dma->dma_address, dir); - d->dma_address += offset; + dma->dma_address += offset;

return count;