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Date:   Sat, 13 Jun 2020 17:14:34 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu, Wolfram Sang <wsa@...nel.org>,
        Dejin Zheng <zhengdejin5@...il.com>,
        Robert Richter <rrichter@...vell.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thor Thayer <thor.thayer@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: busses: Fix reference count leaks.

From: Qiushi Wu <wu000273@....edu>

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code. Thus call pm_runtime_put_noidle()
if pm_runtime_get_sync() fails.

Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/i2c/busses/i2c-img-scb.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c
index 98a89301ed2a..e13ca862fa97 100644
--- a/drivers/i2c/busses/i2c-img-scb.c
+++ b/drivers/i2c/busses/i2c-img-scb.c
@@ -1058,8 +1058,10 @@ static int img_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 	}
 
 	ret = pm_runtime_get_sync(adap->dev.parent);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(adap->dev.parent);
 		return ret;
+	}
 
 	for (i = 0; i < num; i++) {
 		struct i2c_msg *msg = &msgs[i];
@@ -1159,8 +1161,10 @@ static int img_i2c_init(struct img_i2c *i2c)
 	int ret;
 
 	ret = pm_runtime_get_sync(i2c->adap.dev.parent);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c->adap.dev.parent);
 		return ret;
+	}
 
 	rev = img_i2c_readl(i2c, SCB_CORE_REV_REG);
 	if ((rev & 0x00ffffff) < 0x00020200) {
-- 
2.17.1

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