iio: gyro: fxas21002c: Fix missing data update in trigger handler

commit fa13ac6cdf9b6c358e7d77c29fb60145c7a87965 upstream.

The fxas21002c_trigger_handler() may fail to acquire sample data because
the runtime PM enters the autosuspend state and sensor can not return
sample data in standby mode..

Resume the sensor before reading the sample data into the buffer within the
trigger handler. After the data is read, place the sensor back into the
autosuspend state.

Fixes: a0701b6263ae ("iio: gyro: add core driver for fxas21002c")
Signed-off-by: Carlos Song <carlos.song@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20241116152945.4006374-1-Frank.Li@nxp.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/gyro/fxas21002c_core.c b/drivers/iio/gyro/fxas21002c_core.c
index a36d71d9e3ea932a97ff38a2c84e30bf9d590239..e38fd7dcecfe0ccc622096ae913e28f0c99a3c0c 100644 (file)
--- a/drivers/iio/gyro/fxas21002c_core.c
+++ b/drivers/iio/gyro/fxas21002c_core.c
@@ -730,14 +730,21 @@ static irqreturn_t fxas21002c_trigger_handler(int irq, void *p)
        int ret;
 
        mutex_lock(&data->lock);
+       ret = fxas21002c_pm_get(data);
+       if (ret < 0)
+               goto out_unlock;
+
        ret = regmap_bulk_read(data->regmap, FXAS21002C_REG_OUT_X_MSB,
                               data->buffer, CHANNEL_SCAN_MAX * sizeof(s16));
        if (ret < 0)
-               goto out_unlock;
+               goto out_pm_put;
 
        iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
                                           data->timestamp);
 
+out_pm_put:
+       fxas21002c_pm_put(data);
+
 out_unlock:
        mutex_unlock(&data->lock);