linux-kernel - [PATCH] media: coda: Fix runtime PM imbalance in coda

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Date:   Sat, 23 May 2020 18:03:32 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: coda: Fix runtime PM imbalance in coda_probe

When coda_firmware_request() returns an error code,
a pairing runtime PM usage counter decrement is needed
to keep the counter balanced.

Also, the caller expects coda_probe() to increase PM
usage counter, there should be a refcount decrement
in coda_remove() to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/media/platform/coda/coda-common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index d0d093dd8f7c..550e9a1266da 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -3119,6 +3119,8 @@ static int coda_probe(struct platform_device *pdev)
 	return 0;
 
 err_alloc_workqueue:
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
 	destroy_workqueue(dev->workqueue);
 err_v4l2_register:
 	v4l2_device_unregister(&dev->v4l2_dev);
@@ -3136,6 +3138,7 @@ static int coda_remove(struct platform_device *pdev)
 	}
 	if (dev->m2m_dev)
 		v4l2_m2m_release(dev->m2m_dev);
+	pm_runtime_put_noidle(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	v4l2_device_unregister(&dev->v4l2_dev);
 	destroy_workqueue(dev->workqueue);
-- 
2.17.1