[PATCH] drm/nouveau: 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/nouveau_gem.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c 
b/drivers/gpu/drm/nouveau/nouveau_gem.c
index f5ece1f94973..6697f960dd89 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -76,8 +76,10 @@ nouveau_gem_object_open(struct drm_gem_object *gem, struct 
drm_file *file_priv)
                return ret;
 
        ret = pm_runtime_get_sync(dev);
-       if (ret < 0 && ret != -EACCES)
+       if (ret < 0 && ret != -EACCES) {
+               pm_runtime_put_autosuspend(dev);
                goto out;
+       }
 
        ret = nouveau_vma_new(nvbo, vmm, &vma);
        pm_runtime_mark_last_busy(dev);
-- 
2.17.1