iio: gyro: bmg160: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

To make code more readable, use a structure to express the channel
layout and ensure the timestamp is 8 byte aligned.

Found during an audit of all calls of uses of
iio_push_to_buffers_with_timestamp()

Fixes: 13426454b649 ("iio: bmg160: Separate i2c and core driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210501170121.512209-11-jic23@kernel.org

diff --git a/drivers/iio/gyro/bmg160_core.c b/drivers/iio/gyro/bmg160_core.c
index 26a9ed5770c6b1c5d8214a58584064280e1aba16..a7cc2cad8bbf25f5e8b58bf87be74a77341e82c1 100644 (file)
--- a/drivers/iio/gyro/bmg160_core.c
+++ b/drivers/iio/gyro/bmg160_core.c
@@ -98,7 +98,11 @@ struct bmg160_data {
        struct iio_trigger *motion_trig;
        struct iio_mount_matrix orientation;
        struct mutex mutex;
-       s16 buffer[8];
+       /* Ensure naturally aligned timestamp */
+       struct {
+               s16 chans[3];
+               s64 timestamp __aligned(8);
+       } scan;
        u32 dps_range;
        int ev_enable_state;
        int slope_thres;
@@ -882,12 +886,12 @@ static irqreturn_t bmg160_trigger_handler(int irq, void *p)
 
        mutex_lock(&data->mutex);
        ret = regmap_bulk_read(data->regmap, BMG160_REG_XOUT_L,
-                              data->buffer, AXIS_MAX * 2);
+                              data->scan.chans, AXIS_MAX * 2);
        mutex_unlock(&data->mutex);
        if (ret < 0)
                goto err;
 
-       iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
+       iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
                                           pf->timestamp);
 err:
        iio_trigger_notify_done(indio_dev->trig);