linux-kernel - [PATCH -next] i2c: imx-lpi2c: fix PM reference leak in lpi2c_imx_master

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Date:   Thu, 8 Apr 2021 19:19:30 +0800
From:   Ye Weihua <yeweihua4@...wei.com>
To:     <aisheng.dong@....com>, <shawnguo@...nel.org>,
        <s.hauer@...gutronix.de>, <kernel@...gutronix.de>,
        <festevam@...il.com>, <linux-imx@....com>
CC:     <linux-i2c@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <yangjihong1@...wei.com>,
        <zhangjinhao2@...wei.com>
Subject: [PATCH -next] i2c: imx-lpi2c: fix PM reference leak in lpi2c_imx_master_enable()

The PM reference count is not expected to be incremented on return in
ipi2c_imx_master_enable().

However, pm_runtime_get_sync() will increment the PM reference count
even on failure. forgetting to put the reference again will result in
a leak.

Replace it with pm_runtime_resume_and_get() to keep the usage counter
balanced.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Ye Weihua <yeweihua4@...wei.com>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 9db6ccded5e9..8b9ba055c418 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -259,7 +259,7 @@ static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx)
 	unsigned int temp;
 	int ret;
 
-	ret = pm_runtime_get_sync(lpi2c_imx->adapter.dev.parent);
+	ret = pm_runtime_resume_and_get(lpi2c_imx->adapter.dev.parent);
 	if (ret < 0)
 		return ret;
 
-- 
2.17.1