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From:   wu000273@umn.edu
To:     kjlu@umn.edu
Cc:     wu000273@umn.edu, Michal Simek <michal.simek@xilinx.com>,
        Rob Herring <robh@kernel.org>, Wolfram Sang <wsa@kernel.org>,
        Shubhrajyoti Datta <shubhraj@xilinx.com>,
        linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH] i2c: xiic: Fix reference count leaks.
Date:   Sat, 13 Jun 2020 16:59:23 -0500
Message-Id: <20200613215923.2611-1-wu000273@umn.edu>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Qiushi Wu <wu000273@umn.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@umn.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