[PATCH 1/1] drm: exynos: fix for mapping contigous dma buffers

[Rahul Sharma]

This patch fixes the problem of mapping contigous dma buffers. Currently page
struct is calculated from the buf->dma_addr which is not the physical address.
It is replaced by buf->pages which points to the page struct of the first page
of contigous memory chunk. This gives the correct page frame number for
mapping.

Signed-off-by: Rahul Sharma <rahul.sharma at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_gem.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index c557ac7..50d73f1 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -120,8 +120,12 @@ static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
 		}
 
 		pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
-	} else
-		pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
+	} else {
+		if (!buf->pages)
+			return -EINTR;
+
+		pfn = page_to_pfn(buf->pages[0]) + page_offset;
+	}
 
 	return vm_insert_mixed(vma, f_vaddr, pfn);
 }
-- 
1.7.0.4