diff options
| author | Miquel Raynal <miquel.raynal@bootlin.com> | 2022-02-07 17:38:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 19:32:41 +0300 |
| commit | 7821d743abb301a916731a4294eba4927482e148 (patch) | |
| tree | a3f98b733cbf427d434f7b2e9a9ba5c703b4f766 /include/linux/iio | |
| parent | 5a89a92efc342dd7c44b6056da87debc598f9c73 (diff) | |
| download | linux-7821d743abb301a916731a4294eba4927482e148.tar.xz | |
iio: st_sensors: Add a local lock for protecting odr
[ Upstream commit 474010127e2505fc463236470908e1ff5ddb3578 ]
Right now the (framework) mlock lock is (ab)used for multiple purposes:
1- protecting concurrent accesses over the odr local cache
2- avoid changing samplig frequency whilst buffer is running
Let's start by handling situation #1 with a local lock.
Suggested-by: Jonathan Cameron <jic23@kernel.org>
Cc: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220207143840.707510-7-miquel.raynal@bootlin.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux/iio')
| -rw-r--r-- | include/linux/iio/common/st_sensors.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/iio/common/st_sensors.h b/include/linux/iio/common/st_sensors.h index 33e939977444..c16a9dda3ad5 100644 --- a/include/linux/iio/common/st_sensors.h +++ b/include/linux/iio/common/st_sensors.h @@ -228,6 +228,7 @@ struct st_sensor_settings { * @hw_irq_trigger: if we're using the hardware interrupt on the sensor. * @hw_timestamp: Latest timestamp from the interrupt handler, when in use. * @buffer_data: Data used by buffer part. + * @odr_lock: Local lock for preventing concurrent ODR accesses/changes */ struct st_sensor_data { struct device *dev; @@ -253,6 +254,8 @@ struct st_sensor_data { s64 hw_timestamp; char buffer_data[ST_SENSORS_MAX_BUFFER_SIZE] ____cacheline_aligned; + + struct mutex odr_lock; }; #ifdef CONFIG_IIO_BUFFER |