drm/radeon: fix userptr BO unpin bug v3

Fixing a memory leak with userptrs.

v2: clean up the loop, use an iterator instead
v3: remove unused variable

Signed-off-by: monk.liu <monk.liu@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
CC: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index b292aca0f342..edafd3c2b170 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -591,8 +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;
-        int i;
+        struct sg_page_iter sg_iter;
 
         int write = !(gtt->userflags & RADEON_GEM_USERPTR_READONLY);
         enum dma_data_direction direction = write ?
@@ -605,9 +604,8 @@ 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);