[PATCH 5.11 493/601] i2c: sprd: fix reference leak when pm_runtime_get_sync fails

Greg Kroah-Hartman
2021-05-12T17:56:19Z

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 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;

--
2.30.2