[PATCH v2 02/12] drm/atomic: Change drm_atomic_helper_swap_state to return an error.

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

We want to change swap_state to wait indefinitely, but to do this
swap_state should wait interruptibly. This requires propagating
the error to each driver.

Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: intel-gfx@lists.freedesktop.org
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/drm_atomic_helper.c | 22 ++++++++++++++++------
 include/drm/drm_atomic_helper.h     |  3 +--
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 667ec97d4efb..bfb98fbd0e0e 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1510,10 +1510,8 @@ int drm_atomic_helper_commit(struct drm_device *dev,
 
 	if (!nonblock) {
 		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
-		if (ret) {
-			drm_atomic_helper_cleanup_planes(dev, state);
-			return ret;
-		}
+		if (ret)
+			goto err;
 	}
 
 	/*
@@ -1522,7 +1520,9 @@ int drm_atomic_helper_commit(struct drm_device *dev,
 	 * the software side now.
 	 */
 
-	drm_atomic_helper_swap_state(state, true);
+	ret = drm_atomic_helper_swap_state(state, true);
+	if (ret)
+		goto err;
 
 	/*
 	 * Everything below can be run asynchronously without the need to grab
@@ -1551,6 +1551,10 @@ int drm_atomic_helper_commit(struct drm_device *dev,
 		commit_tail(state);
 
 	return 0;
+
+err:
+	drm_atomic_helper_cleanup_planes(dev, state);
+	return ret;
 }
 EXPORT_SYMBOL(drm_atomic_helper_commit);
 
@@ -2254,8 +2258,12 @@ EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
  * the &drm_plane.state, &drm_crtc.state or &drm_connector.state pointer. With
  * the current atomic helpers this is almost always the case, since the helpers
  * don't pass the right state structures to the callbacks.
+ *
+ * Returns:
+ *
+ * Always returns 0, cannot fail yet.
  */
-void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
+int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 				  bool stall)
 {
 	int i;
@@ -2332,6 +2340,8 @@ void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
 
 	__for_each_private_obj(state, obj, obj_state, i, funcs)
 		funcs->swap_state(obj, &state->private_objs[i].obj_state);
+
+	return 0;
 }
 EXPORT_SYMBOL(drm_atomic_helper_swap_state);
 
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index dd196cc0afd7..37c9534ff691 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -84,8 +84,7 @@ void
 drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
 					 bool atomic);
 
-void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
-				  bool stall);
+int drm_atomic_helper_swap_state(struct drm_atomic_state *state, bool stall);
 
 /* nonblocking commit helpers */
 int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
-- 
2.11.0