linux-kernel - [PATCH 4.19 172/245] drm/nouveau: fix runtime pm imbalance on error

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Message-Id: <20200929105955.348976739@linuxfoundation.org>
Date:   Tue, 29 Sep 2020 13:00:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dinghao Liu <dinghao.liu@....edu.cn>,
        Ben Skeggs <bskeggs@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 172/245] drm/nouveau: fix runtime pm imbalance on error

From: Dinghao Liu <dinghao.liu@....edu.cn>

[ Upstream commit d7372dfb3f7f1602b87e0663e8b8646da23ebca7 ]

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@....edu.cn>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 791f970714ed6..a98fccb0d32f9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -82,8 +82,10 @@ 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, &cli->vmm, &vma);
 	pm_runtime_mark_last_busy(dev);
-- 
2.25.1