This is a note to let you know that I've just added the patch titled
iio: imu: st_lsm6dsx: introduce conf_lock mutex
to the 4.15-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-imu-st_lsm6dsx-introduce-conf_lock-mutex.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 335eaedce461c9092e133ce0c6247f5a0b0baf69 Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx>
Date: Mon, 1 Jan 2018 19:54:43 +0100
Subject: iio: imu: st_lsm6dsx: introduce conf_lock mutex
From: Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx>
commit 335eaedce461c9092e133ce0c6247f5a0b0baf69 upstream.
Add conf_lock mutex to prevent concurrent FIFO configuration update
Fixes: 290a6ce11d93 (iio: imu: add support to lsm6dsx driver)
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h | 2 ++
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 21 +++++++++++++--------
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 6 ++++++
3 files changed, 21 insertions(+), 8 deletions(-)
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
@@ -130,6 +130,7 @@ struct st_lsm6dsx_sensor {
* @irq: Device interrupt line (I2C or SPI).
* @lock: Mutex to protect read and write operations.
* @fifo_lock: Mutex to prevent concurrent access to the hw FIFO.
+ * @conf_lock: Mutex to prevent concurrent FIFO configuration update.
* @fifo_mode: FIFO operating mode supported by the device.
* @enable_mask: Enabled sensor bitmask.
* @sip: Total number of samples (acc/gyro) in a given pattern.
@@ -144,6 +145,7 @@ struct st_lsm6dsx_hw {
struct mutex lock;
struct mutex fifo_lock;
+ struct mutex conf_lock;
enum st_lsm6dsx_fifo_mode fifo_mode;
u8 enable_mask;
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
@@ -325,38 +325,40 @@ static int st_lsm6dsx_update_fifo(struct
struct st_lsm6dsx_hw *hw = sensor->hw;
int err;
+ mutex_lock(&hw->conf_lock);
+
if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS) {
err = st_lsm6dsx_flush_fifo(hw);
if (err < 0)
- return err;
+ goto out;
}
if (enable) {
err = st_lsm6dsx_sensor_enable(sensor);
if (err < 0)
- return err;
+ goto out;
} else {
err = st_lsm6dsx_sensor_disable(sensor);
if (err < 0)
- return err;
+ goto out;
}
err = st_lsm6dsx_set_fifo_odr(sensor, enable);
if (err < 0)
- return err;
+ goto out;
err = st_lsm6dsx_update_decimators(hw);
if (err < 0)
- return err;
+ goto out;
err = st_lsm6dsx_update_watermark(sensor, sensor->watermark);
if (err < 0)
- return err;
+ goto out;
if (hw->enable_mask) {
err = st_lsm6dsx_set_fifo_mode(hw, ST_LSM6DSX_FIFO_CONT);
if (err < 0)
- return err;
+ goto out;
/*
* store enable buffer timestamp as reference to compute
@@ -365,7 +367,10 @@ static int st_lsm6dsx_update_fifo(struct
sensor->ts = iio_get_time_ns(iio_dev);
}
- return 0;
+out:
+ mutex_unlock(&hw->conf_lock);
+
+ return err;
}
static irqreturn_t st_lsm6dsx_handler_irq(int irq, void *private)
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -528,7 +528,12 @@ static int st_lsm6dsx_set_watermark(stru
if (val < 1 || val > hw->settings->max_fifo_size)
return -EINVAL;
+ mutex_lock(&hw->conf_lock);
+
err = st_lsm6dsx_update_watermark(sensor, val);
+
+ mutex_unlock(&hw->conf_lock);
+
if (err < 0)
return err;
@@ -739,6 +744,7 @@ int st_lsm6dsx_probe(struct device *dev,
mutex_init(&hw->lock);
mutex_init(&hw->fifo_lock);
+ mutex_init(&hw->conf_lock);
hw->dev = dev;
hw->irq = irq;
Patches currently in stable-queue which might be from lorenzo.bianconi@xxxxxxxxxx are
queue-4.15/iio-imu-st_lsm6dsx-fix-endianness-in-st_lsm6dsx_read_oneshot.patch
queue-4.15/iio-imu-st_lsm6dsx-introduce-conf_lock-mutex.patch