drm/amdgpu: fix userptr BO unpin bug (v2)

sg could point to array of contigiouse page*, only free page could lead
to memory leak.

v2: use iterator

Signed-off-by: monk.liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 120e6e7..729e0bb 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -555,8 +555,7 @@ static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
 {
        struct amdgpu_device *adev = amdgpu_get_adev(ttm->bdev);
        struct amdgpu_ttm_tt *gtt = (void *)ttm;
-       struct scatterlist *sg;
-       int i;
+       struct sg_page_iter sg_iter;
 
        int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
        enum dma_data_direction direction = write ?
@@ -569,9 +568,8 @@ static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
        /* free the sg table and pages again */
        dma_unmap_sg(adev->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 & AMDGPU_GEM_USERPTR_READONLY))
                        set_page_dirty(page);