GEM: Fix oops on NULL dereference when we try clflushing when we don't need to.

diff --git a/linux-core/i915_gem.c b/linux-core/i915_gem.c
index 861e7bb..5c58032 100644 (file)
--- a/linux-core/i915_gem.c
+++ b/linux-core/i915_gem.c
@@ -415,6 +415,13 @@ i915_gem_clflush_object (struct drm_gem_object *obj)
 {
        struct drm_i915_gem_object      *obj_priv = obj->driver_private;
 
+       /* If we don't have a page list set up, then we're not pinned
+        * to GPU, and we can ignore the cache flush because it'll happen
+        * again at bind time.
+        */
+       if (obj_priv->page_list == NULL)
+               return;
+
        drm_ttm_cache_flush (obj_priv->page_list, obj->size / PAGE_SIZE);
 }