FAILED: patch "[PATCH] iio: pressure: mpl115: fix runtime PM leak on read error" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x fbe67ff37a6fd855a6c097f84f3738bd13d0a898
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026071315-browbeat-obnoxious-e1ef@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From fbe67ff37a6fd855a6c097f84f3738bd13d0a898 Mon Sep 17 00:00:00 2001
From: Biren Pandya <[email protected]>
Date: Sun, 14 Jun 2026 12:45:48 +0530
Subject: [PATCH] iio: pressure: mpl115: fix runtime PM leak on read error

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.

index 830a5065c008..16e112b796ba 100644
@@ -106,18 +106,18 @@ 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);
+		pm_runtime_put_autosuspend(data->dev);
 		if (ret < 0)
 			return ret;
-		pm_runtime_put_autosuspend(data->dev);
 
 		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);
+		pm_runtime_put_autosuspend(data->dev);
 		if (ret < 0)
 			return ret;
-		pm_runtime_put_autosuspend(data->dev);
 		*val = ret >> 6;
 
 		return IIO_VAL_INT;

From: Biren Pandya <[email protected]>

[ 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.

---
 drivers/iio/pressure/mpl115.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

index 02ea38c8a3e431..e3eb154feb5fde 100644
@@ -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

From: Biren Pandya <[email protected]>

[ 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.

---
 drivers/iio/pressure/mpl115.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

index 02ea38c8a3e431..e3eb154feb5fde 100644
@@ -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