linux-kernel - [PATCH] i2c: xiic: Fix reference count leaks.

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Date:   Sat, 13 Jun 2020 16:59:23 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu, Michal Simek <michal.simek@...inx.com>,
        Rob Herring <robh@...nel.org>, Wolfram Sang <wsa@...nel.org>,
        Shubhrajyoti Datta <shubhraj@...inx.com>,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: xiic: 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.

Fixes: 36ecbcab84d0 ("i2c: xiic: Implement power management")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/i2c/busses/i2c-xiic.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index 90c1c362394d..ffec41e6be72 100644
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -696,8 +696,10 @@ static int xiic_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 		xiic_getreg8(i2c, XIIC_SR_REG_OFFSET));
 
 	err = pm_runtime_get_sync(i2c->dev);
-	if (err < 0)
+	if (err < 0) {
+		pm_runtime_put_noidle(i2c->dev);
 		return err;
+	}
 
 	err = xiic_busy(i2c);
 	if (err)
@@ -860,8 +862,10 @@ static int xiic_i2c_remove(struct platform_device *pdev)
 	i2c_del_adapter(&i2c->adap);
 
 	ret = pm_runtime_get_sync(i2c->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c->dev);
 		return ret;
+	}
 
 	xiic_deinit(i2c);
 	pm_runtime_put_sync(i2c->dev);
-- 
2.17.1