This is a note to let you know that I've just added the patch titled
iio: chemical: bme680: Fix read/write ops to device by adding mutexes
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-chemical-bme680-fix-read-write-ops-to-device-by-.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 65918dff230af5ee41fb6dd6864ce91ca624ea08
Author: Vasileios Amoiridis <vassilisamir@xxxxxxxxx>
Date: Mon Jun 10 01:38:12 2024 +0200
iio: chemical: bme680: Fix read/write ops to device by adding mutexes
[ Upstream commit 77641e5a477d428335cd094b88ac54e09ccb70f4 ]
Add mutexes in the {read/write}_raw() functions of the device to guard the
read/write of data from/to the device. This is necessary because for any
operation other than temperature, multiple reads need to take place from
the device. Even though regmap has a locking by itself, it won't protect us
from multiple applications trying to read at the same time temperature and
pressure since the pressure reading includes an internal temperature
reading and there is nothing to ensure that this temperature+pressure
reading will happen sequentially without any other operation interfering
in the meantime.
Fixes: 1b3bd8592780 ("iio: chemical: Add support for Bosch BME680 sensor")
Signed-off-by: Vasileios Amoiridis <vassilisamir@xxxxxxxxx>
Link: https://patch.msgid.link/20240609233826.330516-2-vassilisamir@xxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
index 500f56834b01f..a6bf689833dad 100644
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -10,6 +10,7 @@
*/
#include <linux/acpi.h>
#include <linux/bitfield.h>
+#include <linux/cleanup.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/module.h>
@@ -52,6 +53,7 @@ struct bme680_calib {
struct bme680_data {
struct regmap *regmap;
struct bme680_calib bme680;
+ struct mutex lock; /* Protect multiple serial R/W ops to device. */
u8 oversampling_temp;
u8 oversampling_press;
u8 oversampling_humid;
@@ -827,6 +829,8 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
{
struct bme680_data *data = iio_priv(indio_dev);
+ guard(mutex)(&data->lock);
+
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
switch (chan->type) {
@@ -871,6 +875,8 @@ static int bme680_write_raw(struct iio_dev *indio_dev,
{
struct bme680_data *data = iio_priv(indio_dev);
+ guard(mutex)(&data->lock);
+
if (val2 != 0)
return -EINVAL;
@@ -967,6 +973,7 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
name = bme680_match_acpi_device(dev);
data = iio_priv(indio_dev);
+ mutex_init(&data->lock);
dev_set_drvdata(dev, indio_dev);
data->regmap = regmap;
indio_dev->name = name;
