[PATCH] drm/amdgpu: fix "fix 64bit division"

[deathsimple@xxxxxxxxxxx (Christian König)]

From: Christian König <christian.koenig@xxxxxxx>

The offset must be 64bit and add back the accidential dropped line.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index c91f13b..ba11ff254 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -551,9 +551,10 @@ static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
 {
 	struct drm_mm_node *mm = bo->mem.mm_node;
 	uint64_t size = mm->size;
-	unsigned long offset = page_offset;
+	uint64_t offset = page_offset;
 
 	page_offset = do_div(offset, size);
+	mm += offset;
 	return (bo->mem.bus.base >> PAGE_SHIFT) + mm->start + page_offset;
 }
 
-- 
2.7.4