IOMMU-based dma_mmap() implementation lacked proper support for offset
parameter used in mmap call (it always assumed that mapping starts from
offset zero). This patch adds support for offset parameter to IOMMU-based
implementation.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # v3.6+
---
arch/arm/mm/dma-mapping.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 67ae0f2ed983..25ecc6afec4c 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1424,6 +1424,8 @@ static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
return -ENXIO;
+ pages += off;
+
do {
int ret = vm_insert_page(vma, uaddr, *pages++);
if (ret) {
--
1.9.2
--
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