linux-kernel - [PATCH -next] i2c: sprd: Fix PM reference leak in sprd_i2c_master

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Date:   Thu, 8 Apr 2021 20:59:15 +0800
From:   Li Huafei <lihuafei1@...wei.com>
To:     <orsonzhai@...il.com>, <zhang.lyra@...il.com>, <wsa@...nel.org>,
        <zhengdejin5@...il.com>, <linhua.xu@...soc.com>,
        <andriy.shevchenko@...ux.intel.com>
CC:     <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yangjihong1@...wei.com>, <zhangjinhao2@...wei.com>,
        <--lihuafei1@...wei.com>
Subject: [PATCH -next] i2c: sprd: Fix PM reference leak in sprd_i2c_master_xfer()

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@...wei.com>
Signed-off-by: Li Huafei <lihuafei1@...wei.com>
---
 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 2917fecf6c80..8ead7e021008 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;
 
@@ -576,7 +576,7 @@ 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;
 
-- 
2.17.1