From c4bbb7358425b3a1c93f4d8c12a8fe46438ca73b Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date: Tue, 11 Jul 2017 16:33:14 +0200
Subject: [PATCH] drm/atomic: Allow drm_atomic_helper_swap_state to fail
Git-commit: c4bbb7358425b3a1c93f4d8c12a8fe46438ca73b
Patch-mainline: v4.14-rc1
References: FATE#322643 bsc#1055900

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170711143314.2148-13-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/drm_atomic_helper.c |   15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2261,13 +2261,13 @@ EXPORT_SYMBOL(drm_atomic_helper_cleanup_
  *
  * Returns:
  *
- * Always returns 0, cannot fail yet.
+ * Returns 0 on success. Can return -ERESTARTSYS when @stall is true and the
+ * waiting for the previous commits has been interrupted.
  */
 int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 				  bool stall)
 {
-	int i;
-	long ret;
+	int i, ret;
 	struct drm_connector *connector;
 	struct drm_connector_state *old_conn_state, *new_conn_state;
 	struct drm_crtc *crtc;
@@ -2290,12 +2290,11 @@ int drm_atomic_helper_swap_state(struct
 			if (!commit)
 				continue;
 
-			ret = wait_for_completion_timeout(&commit->hw_done,
-							  10*HZ);
-			if (ret == 0)
-				DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n",
-					  crtc->base.id, crtc->name);
+			ret = wait_for_completion_interruptible(&commit->hw_done);
 			drm_crtc_commit_put(commit);
+
+			if (ret)
+				return ret;
 		}
 	}