linux-kernel - [PATCH] i2c: stm32f7: Fix runtime PM imbalance in stm32f7_i2c_unreg

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Date:   Thu, 21 May 2020 15:08:47 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Pierre-Yves MORDRET <pierre-yves.mordret@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-i2c@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: stm32f7: Fix runtime PM imbalance in stm32f7_i2c_unreg_slave

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a pairing decrement is needed
on the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/i2c/busses/i2c-stm32f7.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 330ffed011e0..6f5f0fa68385 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1837,8 +1837,10 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
 	WARN_ON(!i2c_dev->slave[id]);
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_autosuspend(i2c_dev->dev);
 		return ret;
+	}
 
 	if (id == 0) {
 		mask = STM32F7_I2C_OAR1_OA1EN;
-- 
2.17.1