[PATCH] i2c: imx-lpi2c: fix runtime pm imbalance on error

[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-imx-lpi2c.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c 
b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 94743ba581fe..89908c24c8b3 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -260,8 +260,10 @@ static int lpi2c_imx_master_enable(struct lpi2c_imx_struct 
*lpi2c_imx)
        int ret;
 
        ret = pm_runtime_get_sync(lpi2c_imx->adapter.dev.parent);
-       if (ret < 0)
+       if (ret < 0) {
+               pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent);
                return ret;
+       }
 
        temp = MCR_RST;
        writel(temp, lpi2c_imx->base + LPI2C_MCR);
-- 
2.17.1