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

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Message-Id: <20200521084634.31966-1-dinghao.liu@zju.edu.cn>
Date:   Thu, 21 May 2020 16:46:32 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Chuhong Yuan <hslester96@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Colin Ian King <colin.king@...onical.com>,
        YueHaibing <yuehaibing@...wei.com>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] dmaengine: ti: edma: 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.

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

diff --git a/drivers/dma/ti/edma.c b/drivers/dma/ti/edma.c
index c4a5c170c1f9..609ce2607eb7 100644
--- a/drivers/dma/ti/edma.c
+++ b/drivers/dma/ti/edma.c
@@ -2402,8 +2402,7 @@ static int edma_probe(struct platform_device *pdev)
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
 		dev_err(dev, "pm_runtime_get_sync() failed\n");
-		pm_runtime_disable(dev);
-		return ret;
+		goto err_disable_pm;
 	}
 
 	/* Get eDMA3 configuration from IP */
-- 
2.17.1