drm/exynos: use drm_for_each_connector_iter()

Drop legacy drm_for_each_connector() in favor of the race-free
drm_for_each_connector_iter()

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170511191049.28944-2-gustavo@padovan.org

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -171,12 +171,13 @@ static int exynos_drm_suspend(struct device *dev)
 {
 	struct drm_device *drm_dev = dev_get_drvdata(dev);
 	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
 
 	if (pm_runtime_suspended(dev) || !drm_dev)
 		return 0;
 
-	drm_modeset_lock_all(drm_dev);
-	drm_for_each_connector(connector, drm_dev) {
+	drm_connector_list_iter_begin(drm_dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
 		int old_dpms = connector->dpms;
 
 		if (connector->funcs->dpms)
@@ -185,7 +186,7 @@ static int exynos_drm_suspend(struct device *dev)
 		/* Set the old mode back to the connector for resume */
 		connector->dpms = old_dpms;
 	}
-	drm_modeset_unlock_all(drm_dev);
+	drm_connector_list_iter_end(&conn_iter);
 
 	return 0;
 }
@@ -194,12 +195,13 @@ static int exynos_drm_resume(struct device *dev)
 {
 	struct drm_device *drm_dev = dev_get_drvdata(dev);
 	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
 
 	if (pm_runtime_suspended(dev) || !drm_dev)
 		return 0;
 
-	drm_modeset_lock_all(drm_dev);
-	drm_for_each_connector(connector, drm_dev) {
+	drm_connector_list_iter_begin(drm_dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
 		if (connector->funcs->dpms) {
 			int dpms = connector->dpms;
 
@@ -207,7 +209,7 @@ static int exynos_drm_resume(struct device *dev)
 			connector->funcs->dpms(connector, dpms);
 		}
 	}
-	drm_modeset_unlock_all(drm_dev);
+	drm_connector_list_iter_end(&conn_iter);
 
 	return 0;
 }