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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hulk Robot <hulkci@huawei.com>,
        Qinglang Miao <miaoqinglang@huawei.com>,
        Wolfram Sang <wsa@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 200/244] i2c: sprd: fix reference leak when pm_runtime_get_sync fails
Date:   Wed, 12 May 2021 16:49:31 +0200
Message-Id: <20210512144749.401897700@linuxfoundation.org>
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From: Qinglang Miao <miaoqinglang@huawei.com>

[ Upstream commit 3a4f326463117cee3adcb72999ca34a9aaafda93 ]

The PM reference count is not expected to be incremented on
return in sprd_i2c_master_xfer() and sprd_i2c_remove().

However, pm_runtime_get_sync will increment the 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: 8b9ec0719834 ("i2c: Add Spreadtrum I2C controller driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/i2c/busses/i2c-sprd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
index b2dc80286464..92ba0183fd8a 100644
--- a/drivers/i2c/busses/i2c-sprd.c
+++ b/drivers/i2c/busses/i2c-sprd.c
@@ -290,7 +290,7 @@ static int sprd_i2c_master_xfer(struct i2c_adapter *i2c_adap,
 	struct sprd_i2c *i2c_dev = i2c_adap->algo_data;
 	int im, ret;
 
-	ret = pm_runtime_get_sync(i2c_dev->dev);
+	ret = pm_runtime_resume_and_get(i2c_dev->dev);
 	if (ret < 0)
 		return ret;
 
@@ -577,7 +577,7 @@ static int sprd_i2c_remove(struct platform_device *pdev)
 	struct sprd_i2c *i2c_dev = platform_get_drvdata(pdev);
 	int ret;
 
-	ret = pm_runtime_get_sync(i2c_dev->dev);
+	ret = pm_runtime_resume_and_get(i2c_dev->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.30.2