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From:   Yu Kuai <yukuai3@huawei.com>
To:     <vkoul@kernel.org>, <mcoquelin.stm32@gmail.com>,
        <alexandre.torgue@foss.st.com>, <michal.simek@xilinx.com>
CC:     <dmaengine@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>, <yukuai3@huawei.com>,
        <yi.zhang@huawei.com>
Subject: [PATCH 1/3] dmaengine: stm32-mdma: fix PM reference leak in stm32_mdma_alloc_chan_resourc()
Date:   Mon, 17 May 2021 16:18:24 +0800
Message-ID: <20210517081826.1564698-2-yukuai3@huawei.com>
In-Reply-To: <20210517081826.1564698-1-yukuai3@huawei.com>
References: <20210517081826.1564698-1-yukuai3@huawei.com>
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pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/dma/stm32-mdma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
index 36ba8b43e78d..18cbd1e43c2e 100644
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -1452,7 +1452,7 @@ static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
 		return -ENOMEM;
 	}
 
-	ret = pm_runtime_get_sync(dmadev->ddev.dev);
+	ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
 	if (ret < 0)
 		return ret;
 
@@ -1718,7 +1718,7 @@ static int stm32_mdma_pm_suspend(struct device *dev)
 	u32 ccr, id;
 	int ret;
 
-	ret = pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.25.4