drm/exynos: fix layering violation of address

There is no guarantee that DMA addresses are the same as physical
addresses, but dma_to_pfn() knows how to convert a dma_addr_t to a PFN
which can then be converted to a struct page.

Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index f12fbc3..a4fb78e 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -77,7 +77,8 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem_obj *obj)
 
                start_addr = obj->dma_addr;
                while (i < nr_pages) {
-                       obj->pages[i] = phys_to_page(start_addr);
+                       obj->pages[i] = pfn_to_page(dma_to_pfn(dev->dev,
+                                                              start_addr));
                        start_addr += PAGE_SIZE;
                        i++;
                }