linux-kernel - [PATCH AUTOSEL 4.19 20/56] media: venus: core: Fix runtime PM imbalance in venus

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Message-Id: <20201018192417.4055228-20-sashal@kernel.org>
Date:   Sun, 18 Oct 2020 15:23:41 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dinghao Liu <dinghao.liu@....edu.cn>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 20/56] media: venus: core: Fix runtime PM imbalance in venus_probe

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

[ Upstream commit bbe516e976fce538db96bd2b7287df942faa14a3 ]

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code. Thus a pairing decrement is needed on
the error handling path to keep the counter balanced. For other error
paths after this call, things are the same.

Fix this by adding pm_runtime_put_noidle() after 'err_runtime_disable'
label. But in this case, the error path after pm_runtime_put_sync()
will decrease PM usage counter twice. Thus add an extra
pm_runtime_get_noresume() in this path to balance PM counter.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/qcom/venus/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 60069869596cb..168f5af6abcc2 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -321,8 +321,10 @@ static int venus_probe(struct platform_device *pdev)
 		goto err_dev_unregister;
 
 	ret = pm_runtime_put_sync(dev);
-	if (ret)
+	if (ret) {
+		pm_runtime_get_noresume(dev);
 		goto err_dev_unregister;
+	}
 
 	return 0;
 
@@ -333,6 +335,7 @@ static int venus_probe(struct platform_device *pdev)
 err_venus_shutdown:
 	venus_shutdown(dev);
 err_runtime_disable:
+	pm_runtime_put_noidle(dev);
 	pm_runtime_set_suspended(dev);
 	pm_runtime_disable(dev);
 	hfi_destroy(core);
-- 
2.25.1