[PATCH 6.6.y] iio: pressure: mpl115: fix runtime PM leak on read error

[Sasha Levin <sashal@kernel.org>]

From: Biren Pandya <birenpandya@gmail.com>

[ Upstream commit fbe67ff37a6fd855a6c097f84f3738bd13d0a898 ]

mpl115_read_raw() takes a runtime PM reference with pm_runtime_get_sync()
before reading the processed pressure or raw temperature, but on the read
error path it returns without calling pm_runtime_put_autosuspend(). Each
failed read therefore leaks a runtime PM reference and prevents the device
from autosuspending.

Drop the reference before checking the return value so both the success
and error paths are balanced.

Fixes: 0c3a333524a3 ("iio: pressure: mpl115: Implementing low power mode by shutdown gpio")
Signed-off-by: Biren Pandya <birenpandya@gmail.com>
Assisted-by: Claude:claude-opus-4-8 coccinelle
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
[ moved pm_runtime_mark_last_busy() together with pm_runtime_put_autosuspend() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/pressure/mpl115.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/pressure/mpl115.c b/drivers/iio/pressure/mpl115.c
index 02ea38c8a3e431..e3eb154feb5fde 100644
--- a/drivers/iio/pressure/mpl115.c
+++ b/drivers/iio/pressure/mpl115.c
@@ -106,20 +106,20 @@ static int mpl115_read_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_PROCESSED:
 		pm_runtime_get_sync(data->dev);
 		ret = mpl115_comp_pressure(data, val, val2);
-		if (ret < 0)
-			return ret;
 		pm_runtime_mark_last_busy(data->dev);
 		pm_runtime_put_autosuspend(data->dev);
+		if (ret < 0)
+			return ret;
 
 		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_RAW:
 		pm_runtime_get_sync(data->dev);
 		/* temperature -5.35 C / LSB, 472 LSB is 25 C */
 		ret = mpl115_read_temp(data);
-		if (ret < 0)
-			return ret;
 		pm_runtime_mark_last_busy(data->dev);
 		pm_runtime_put_autosuspend(data->dev);
+		if (ret < 0)
+			return ret;
 		*val = ret >> 6;
 
 		return IIO_VAL_INT;
-- 
2.53.0