[PATCH] drm/nouveau/dispnv50: fix runtime pm imbalance on error

[Dinghao Liu]

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a pairing decrement is needed
on the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao....@zju.edu.cn>
---
 drivers/gpu/drm/nouveau/dispnv50/disp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c 
b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 6be9df1820c5..e670756664ff 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -1123,8 +1123,10 @@ nv50_mstc_detect(struct drm_connector *connector,
                return connector_status_disconnected;
 
        ret = pm_runtime_get_sync(connector->dev->dev);
-       if (ret < 0 && ret != -EACCES)
+       if (ret < 0 && ret != -EACCES) {
+               pm_runtime_put_autosuspend(connector->dev->dev);
                return connector_status_disconnected;
+       }
 
        ret = drm_dp_mst_detect_port(connector, ctx, mstc->port->mgr,
                                     mstc->port);
-- 
2.17.1