linux-kernel - [PATCH] i2c: sprd: Fix runtime PM imbalance on error

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Date:   Mon, 22 Jun 2020 10:05:18 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Wolfram Sang <wsa@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Patrice Chotard <patrice.chotard@...com>,
        Scott Branden <scott.branden@...adcom.com>,
        Dejin Zheng <zhengdejin5@...il.com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: sprd: Fix runtime PM imbalance on error

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a corresponding decrement is
needed on the error handling path to keep the counter balanced.

Fix this by adding the missed function call.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/i2c/busses/i2c-sprd.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
index 19cda6742423..675f72a3fd60 100644
--- a/drivers/i2c/busses/i2c-sprd.c
+++ b/drivers/i2c/busses/i2c-sprd.c
@@ -285,8 +285,10 @@ static int sprd_i2c_master_xfer(struct i2c_adapter *i2c_adap,
 	int im, ret;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	for (im = 0; im < num - 1; im++) {
 		ret = sprd_i2c_handle_msg(i2c_adap, &msgs[im], 0);
@@ -571,8 +573,10 @@ static int sprd_i2c_remove(struct platform_device *pdev)
 	int ret;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	i2c_del_adapter(&i2c_dev->adap);
 	clk_disable_unprepare(i2c_dev->clk);
-- 
2.17.1