[PATCH 2/2] drm/atomic: Wait indefinitely and interruptibly for hw_done.

[Maarten Lankhorst]

Without waiting for hw_done, previous atomic updates may dereference
the wrong state and cause a lot of confusion. The real fix is fixing
all obj->state to use the accessor macros, but for now wait
indefinitely and interruptibly.

Cc: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
Cc: CK Hu <ck.hu@xxxxxxxxxxxx>
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Rob Clark <robdclark@xxxxxxxxx>
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Cc: Jonathan Hunter <jonathanh@xxxxxxxxxx>
Cc: Jyri Sarha <jsarha@xxxxxx>
Cc: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Cc: Eric Anholt <eric@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-mediatek@xxxxxxxxxxxxxxxxxxx
Cc: linux-arm-msm@xxxxxxxxxxxxxxx
Cc: freedreno@xxxxxxxxxxxxxxxxxxxxx
Cc: nouveau@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-tegra@xxxxxxxxxxxxxxx
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_atomic_helper.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index f66b6c45cdd0..56e7729d993d 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2144,8 +2144,7 @@ EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
 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;
@@ -2168,12 +2167,11 @@ 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;
 		}
 	}
 
-- 
2.11.0