[PATCH] i2c: stm32f7: Fix runtime PM imbalance in stm32f7_i2c_reg_slave

[Dinghao Liu]

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....@zju.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..602cf35649c8 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1767,8 +1767,10 @@ static int stm32f7_i2c_reg_slave(struct i2c_client 
*slave)
                return ret;
 
        ret = pm_runtime_get_sync(dev);
-       if (ret < 0)
+       if (ret < 0) {
+               pm_runtime_put_autosuspend(dev);
                return ret;
+       }
 
        if (!stm32f7_i2c_is_slave_registered(i2c_dev))
                stm32f7_i2c_enable_wakeup(i2c_dev, true);
-- 
2.17.1