ARM: dma-mapping: add support for offset parameter in dma_mmap()

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@samsung.com>
CC: stable@vger.kernel.org  # v3.6+

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index dacabff87eaedea5ea5f61acb9a1825437a4e531..a04dfbe2d4a20389e21fc060e0939b604c0e94ce 100644 (file)
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1376,6 +1376,8 @@ 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) {