2 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_object.c b/drivers/gpu/drm/ttm/ttm_object.c
index 37079859afc8..53b51c4e671a 100644
--- a/drivers/gpu/drm/ttm/ttm_object.c
+++ b/drivers/gpu/drm/ttm/ttm_object.c
@@ -292,7 +292,7 @@ int ttm_ref_object_add(struct ttm_object_file *tfile,
 
                 if (ret == 0) {
                         ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
-                        if (!kref_get_unless_zero(&ref->kref)) {
+                        if (kref_get_unless_zero(&ref->kref)) {
                                 rcu_read_unlock();
                                 break;
                         }
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 9af99084b344..75f319090043 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -380,6 +380,9 @@ static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
         pgoff_t i;
         struct page **page = ttm->pages;
 
+        if (ttm->page_flags & TTM_PAGE_FLAG_SG)
+                return;
+
         for (i = 0; i < ttm->num_pages; ++i) {
                 (*page)->mapping = NULL;
                 (*page++)->index = 0;