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

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Date:   Sat, 24 Feb 2018 23:44:50 +0100
From:   Tobias Jordan <Tobias.Jordan@...ktrobit.com>
To:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Wolfram Sang <wsa@...-dreams.de>
Subject: [PATCH] i2c: xiic: 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
error branch.

Fixes: 36ecbcab84d0 ("i2c: xiic: Implement power management")
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-xiic.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index ae6ed254e01d..fd03e40ca832 100644
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -682,8 +682,10 @@ 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)
-- 
2.11.0