linux-kernel - [PATCH] dmaengine: sprd: Fix runtime PM imbalance on error

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Date:   Fri, 22 May 2020 14:52:43 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dmaengine: sprd: Fix runtime PM imbalance on error

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.

Also, call pm_runtime_disable() when pm_runtime_get_sync() returns
an error code.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/dma/sprd-dma.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 0ef5ca81ba4d..275d83768d0d 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -1210,7 +1210,7 @@ static int sprd_dma_probe(struct platform_device *pdev)
 	ret = dma_async_device_register(&sdev->dma_dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
-		goto err_register;
+		goto err_rpm;
 	}
 
 	sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
@@ -1224,10 +1224,9 @@ static int sprd_dma_probe(struct platform_device *pdev)
 
 err_of_register:
 	dma_async_device_unregister(&sdev->dma_dev);
-err_register:
+err_rpm:
 	pm_runtime_put_noidle(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-err_rpm:
 	sprd_dma_disable(sdev);
 	return ret;
 }
-- 
2.17.1