linux-kernel - [PATCH] i2c: tegra: Fix PM device usage count

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Date:   Sat, 24 Feb 2018 23:44:23 +0100
From:   Tobias Jordan <Tobias.Jordan@...ktrobit.com>
To:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Subject: [PATCH] i2c: tegra: Fix PM device usage count

pm_runtime_get_sync() increases the device's usage count even when
reporting an error, so add a call to pm_runtime_put_noidle() in the
related error branches.

Fixes: 1f50ad2c86cd ("i2c: tegra: Add runtime power-management support")
Signed-off-by: Tobias Jordan <Tobias.Jordan@...ktrobit.com>
---
This is one of a number of patches for problems found using coccinelle 
scripting in the SIL2LinuxMP project. The patch has been compile-tested;
it's based on linux-next-20180223.

For a discussion of the corresponding issue, see
https://marc.info/?l=linux-pm&m=151904483924999&w=2

 drivers/i2c/busses/i2c-tegra.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 60292d243e24..d53136538339 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -484,6 +484,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 	err = pm_runtime_get_sync(i2c_dev->dev);
 	if (err < 0) {
 		dev_err(i2c_dev->dev, "runtime resume failed %d\n", err);
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return err;
 	}
 
@@ -740,6 +741,7 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
 	ret = pm_runtime_get_sync(i2c_dev->dev);
 	if (ret < 0) {
 		dev_err(i2c_dev->dev, "runtime resume failed %d\n", ret);
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
 	}
 
-- 
2.11.0