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iio: st_sensors: Add a local lock for protecting odr
[ Upstream commit 474010127e
]
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>
This commit is contained in:
parent
5a89a92efc
commit
7821d743ab
2 changed files with 21 additions and 6 deletions
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@ -70,16 +70,18 @@ static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
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int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
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{
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int err;
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int err = 0;
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struct st_sensor_odr_avl odr_out = {0, 0};
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struct st_sensor_data *sdata = iio_priv(indio_dev);
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mutex_lock(&sdata->odr_lock);
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if (!sdata->sensor_settings->odr.mask)
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return 0;
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goto unlock_mutex;
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err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
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if (err < 0)
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goto st_sensors_match_odr_error;
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goto unlock_mutex;
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if ((sdata->sensor_settings->odr.addr ==
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sdata->sensor_settings->pw.addr) &&
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@ -102,7 +104,9 @@ int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
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if (err >= 0)
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sdata->odr = odr_out.hz;
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st_sensors_match_odr_error:
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unlock_mutex:
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mutex_unlock(&sdata->odr_lock);
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return err;
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}
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EXPORT_SYMBOL(st_sensors_set_odr);
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@ -364,6 +368,8 @@ int st_sensors_init_sensor(struct iio_dev *indio_dev,
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struct st_sensors_platform_data *of_pdata;
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int err = 0;
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mutex_init(&sdata->odr_lock);
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/* If OF/DT pdata exists, it will take precedence of anything else */
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of_pdata = st_sensors_dev_probe(indio_dev->dev.parent, pdata);
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if (IS_ERR(of_pdata))
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@ -557,18 +563,24 @@ int st_sensors_read_info_raw(struct iio_dev *indio_dev,
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err = -EBUSY;
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goto out;
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} else {
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mutex_lock(&sdata->odr_lock);
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err = st_sensors_set_enable(indio_dev, true);
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if (err < 0)
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if (err < 0) {
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mutex_unlock(&sdata->odr_lock);
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goto out;
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}
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msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
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err = st_sensors_read_axis_data(indio_dev, ch, val);
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if (err < 0)
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if (err < 0) {
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mutex_unlock(&sdata->odr_lock);
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goto out;
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}
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*val = *val >> ch->scan_type.shift;
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err = st_sensors_set_enable(indio_dev, false);
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mutex_unlock(&sdata->odr_lock);
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}
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out:
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mutex_unlock(&indio_dev->mlock);
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@ -228,6 +228,7 @@ struct st_sensor_settings {
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* @hw_irq_trigger: if we're using the hardware interrupt on the sensor.
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* @hw_timestamp: Latest timestamp from the interrupt handler, when in use.
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* @buffer_data: Data used by buffer part.
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* @odr_lock: Local lock for preventing concurrent ODR accesses/changes
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*/
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struct st_sensor_data {
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struct device *dev;
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@ -253,6 +254,8 @@ struct st_sensor_data {
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s64 hw_timestamp;
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char buffer_data[ST_SENSORS_MAX_BUFFER_SIZE] ____cacheline_aligned;
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struct mutex odr_lock;
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};
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#ifdef CONFIG_IIO_BUFFER
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