drm/atomic: Allow drm_atomic_helper_swap_state to fail

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>

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 8d8221a..70146f8 100644 (file)
--- 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_planes);
  *
  * 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 drm_atomic_state *state,
                        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;
                }
        }