[PATCH] iio: accel: kxsd9: Fix runtime PM leak in kxsd9_write_raw()

[Wentao Liang]

pm_runtime_get_sync() increments the usage counter even on failure, so
every successful call must be paired with a put. Rejecting an invalid
scale value returned early and skipped the paired
pm_runtime_put_autosuspend(), permanently preventing runtime suspend.

Fixes: 9a9a369d6178 ("iio: accel: kxsd9: Deploy system and runtime PM")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/iio/accel/kxsd9.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/accel/kxsd9.c b/drivers/iio/accel/kxsd9.c
index 4717d80fc24a..1186d711f4d3 100644
--- a/drivers/iio/accel/kxsd9.c
+++ b/drivers/iio/accel/kxsd9.c
@@ -146,8 +146,10 @@ static int kxsd9_write_raw(struct iio_dev *indio_dev,
 
 	if (mask == IIO_CHAN_INFO_SCALE) {
 		/* Check no integer component */
-		if (val)
+		if (val) {
+			pm_runtime_put_autosuspend(st->dev);
 			return -EINVAL;
+		}
 		ret = kxsd9_write_scale(indio_dev, val2);
 	}
 
-- 
2.34.1