[PATCH] drm/radeon: fix userptr BO unpin bug v2

[Christian König]

From: "monk.liu" <monk.liu at amd.com>

Fixing a memory leak with userptrs.

v2: clean up the loop, use an iterator instead

Signed-off-by: monk.liu <monk.liu at amd.com>
Signed-off-by: Christian König <christian.koenig at amd.com>
CC: stable at vger.kernel.org
---
 drivers/gpu/drm/radeon/radeon_ttm.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index b292aca..921dd0f 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -591,7 +591,7 @@ static void radeon_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 {
 	struct radeon_device *rdev = radeon_get_rdev(ttm->bdev);
 	struct radeon_ttm_tt *gtt = (void *)ttm;
-	struct scatterlist *sg;
+	struct sg_page_iter sg_iter;
 	int i;
 
 	int write = !(gtt->userflags & RADEON_GEM_USERPTR_READONLY);
@@ -605,9 +605,8 @@ static void radeon_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 	/* free the sg table and pages again */
 	dma_unmap_sg(rdev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
 
-	for_each_sg(ttm->sg->sgl, sg, ttm->sg->nents, i) {
-		struct page *page = sg_page(sg);
-
+	for_each_sg_page(ttm->sg->sgl, &sg_iter, ttm->sg->nents, 0) {
+		struct page *page = sg_page_iter_page(&sg_iter);
 		if (!(gtt->userflags & RADEON_GEM_USERPTR_READONLY))
 			set_page_dirty(page);
 
-- 
1.9.1