Re: [PATCH 1/2] ARM: initial proof-of-concept IOMMU mapper for DMA-mapping

[Krishna Reddy <vdumpa@nvidia.com>]

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;

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