ARM: 8427/1: dma-mapping: add support for offset parameter in dma_mmap()

commit 7e31210349e9e03a9a4dff31ab5f2bc83e8e84f5 upstream.

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>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 67ae0f2ed983ada372c1a4b4a4f0627c6d66032f..25ecc6afec4cf1e54088d57bbf82d59bfa669cf1 100644 (file)
--- 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) {