[PATCH] [v3] 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 corresponding decrement is
needed on the error handling path to keep the counter balanced.

Fix this by adding the missed function call.

Fixes: 13d6eb20fc79a ("i2c: imx-lpi2c: add runtime pm support")
Co-developed-by: Markus Elfring <markus.elfr...@web.de>
Signed-off-by: Markus Elfring <markus.elfr...@web.de>
Signed-off-by: Dinghao Liu <dinghao....@zju.edu.cn>
---

Changelog:

v2: - Use pm_runtime_put_noidle() instead of
      pm_runtime_put_autosuspend().

v3: - Refine commit message.
---
 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..bdee02dff284 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_noidle(lpi2c_imx->adapter.dev.parent);
                return ret;
+       }
 
        temp = MCR_RST;
        writel(temp, lpi2c_imx->base + LPI2C_MCR);
-- 
2.17.1