linux-kernel - [PATCH] i2c: busses: Fix a reference count leak.

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Message-Id: <20200613221213.6679-1-wu000273@umn.edu>
Date:   Sat, 13 Jun 2020 17:12:13 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu, Dong Aisheng <aisheng.dong@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Wolfram Sang <wsa@...nel.org>,
        Fugang Duan <fugang.duan@....com>, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: busses: Fix a reference count leak.

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.

Fixes: 13d6eb20fc79 ("i2c: imx-lpi2c: add runtime pm support")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 9db6ccded5e9..85b9c1fc7681 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -260,8 +260,10 @@ static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx)
 	int ret;
 
 	ret = pm_runtime_get_sync(lpi2c_imx->adapter.dev.parent);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(lpi2c_imx->adapter.dev.parent);
 		return ret;
+	}
 
 	temp = MCR_RST;
 	writel(temp, lpi2c_imx->base + LPI2C_MCR);
-- 
2.17.1