From dc455f4c888365595c0a13da445e092422d55b8d Mon Sep 17 00:00:00 2001
From: Dinghao Liu <dinghao.liu@zju.edu.cn>
Date: Wed, 20 May 2020 18:47:48 +0800
Subject: [PATCH] drm/nouveau/dispnv50: fix runtime pm imbalance on error
Git-commit: dc455f4c888365595c0a13da445e092422d55b8d
Patch-mainline: v5.8-rc1
References: git-fixes

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.liu@zju.edu.cn>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/nouveau/dispnv50/disp.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -947,8 +947,10 @@ nv50_mstc_detect(struct drm_connector *c
 		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;
+	}
 
 	conn_status = drm_dp_mst_detect_port(connector, mstc->port->mgr,
 					     mstc->port);