diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index d009661..1b3e0ff 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -159,6 +159,9 @@
 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file_priv)
 {
+	if (file_priv->is_master)
+		return 0;
+
 	if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
 		return -EINVAL;
 
@@ -169,6 +172,7 @@
 	    file_priv->minor->master != file_priv->master) {
 		mutex_lock(&dev->struct_mutex);
 		file_priv->minor->master = drm_master_get(file_priv->master);
+		file_priv->is_master = 1;
 		mutex_unlock(&dev->struct_mutex);
 	}
 
@@ -178,10 +182,12 @@
 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv)
 {
-	if (!file_priv->master)
+	if (!file_priv->is_master)
 		return -EINVAL;
+
 	mutex_lock(&dev->struct_mutex);
 	drm_master_put(&file_priv->minor->master);
+	file_priv->is_master = 0;
 	mutex_unlock(&dev->struct_mutex);
 	return 0;
 }