linux-kernel - [PATCH 5.12 559/677] i2c: imx: fix reference leak when pm_runtime_get

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Message-Id: <20210512144855.966812551@linuxfoundation.org>
Date:   Wed, 12 May 2021 16:50:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Qinglang Miao <miaoqinglang@...wei.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Wolfram Sang <wsa@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 559/677] i2c: imx: fix reference leak when pm_runtime_get_sync fails

From: Qinglang Miao <miaoqinglang@...wei.com>

[ Upstream commit 47ff617217ca6a13194fcb35c6c3a0c57c080693 ]

In i2c_imx_xfer() and i2c_imx_remove(), the pm reference count
is not expected to be incremented on return.

However, pm_runtime_get_sync will increment pm reference count
even failed. Forgetting to putting operation will result in a
reference leak here.

Replace it with pm_runtime_resume_and_get to keep usage
counter balanced.

Fixes: 3a5ee18d2a32 ("i2c: imx: implement master_xfer_atomic callback")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
Reviewed-by: Oleksij Rempel <o.rempel@...gutronix.de>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-imx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index b80fdc1f0092..dc9c4b4cc25a 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -1253,7 +1253,7 @@ static int i2c_imx_xfer(struct i2c_adapter *adapter,
 	struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter);
 	int result;
 
-	result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent);
+	result = pm_runtime_resume_and_get(i2c_imx->adapter.dev.parent);
 	if (result < 0)
 		return result;
 
@@ -1496,7 +1496,7 @@ static int i2c_imx_remove(struct platform_device *pdev)
 	struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
 	int irq, ret;
 
-	ret = pm_runtime_get_sync(&pdev->dev);
+	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.30.2