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

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Message-ID: <6db72962.1929f.17e61cadc03.Coremail.lyz_cs@pku.edu.cn>
Date:   Sun, 16 Jan 2022 15:29:51 +0800 (GMT+08:00)
From:   刘永志 <lyz_cs@....edu.cn>
To:     laurent.pinchart@...asonboard.com
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dmaengine: shdma: Fix runtime PM imbalance on error

pm_runtime_get_() increments the runtime PM usage counter even
when it returns an error code, thus a matching decrement is needed on
the error handling path to keep the counter balanced.

Signed-off-by: Yongzhi Liu <lyz_cs@....edu.cn>
---
 drivers/dma/sh/shdma-base.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
index 158e5e7..b26ed69 100644
--- a/drivers/dma/sh/shdma-base.c
+++ b/drivers/dma/sh/shdma-base.c
@@ -115,8 +115,10 @@ static dma_cookie_t shdma_tx_submit(struct dma_async_tx_descriptor *tx)
 		ret = pm_runtime_get(schan->dev);
 
 		spin_unlock_irq(&schan->chan_lock);
-		if (ret < 0)
+		if (ret < 0) {
 			dev_err(schan->dev, "%s(): GET = %d\n", __func__, ret);
+			pm_runtime_put(schan->dev);
+		}
 
 		pm_runtime_barrier(schan->dev);
 
-- 
2.7.4