iio: sx9310: Fixes various memory handling

Makes use __aligned(8) to ensure that the timestamp is correctly aligned
when we call io_push_to_buffers_with_timestamp().
Also makes use of sizeof() for regmap_bulk_read instead of static value.
Signed-off-by: Daniel Campello <campello@chromium.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/proximity/sx9310.c

@@ -132,8 +132,11 @@ struct sx9310_data {
 	 */
 	bool prox_stat[SX9310_NUM_CHANNELS];
 	bool trigger_enabled;
-	__be16 buffer[SX9310_NUM_CHANNELS +
-		      4]; /* 64-bit data + 64-bit timestamp */
+	/* Ensure correct alignment of timestamp when present. */
+	struct {
+		__be16 channels[SX9310_NUM_CHANNELS];
+		s64 ts __aligned(8);
+	} buffer;
 	/* Remember enabled channels and sample rate during suspend. */
 	unsigned int suspend_ctrl0;
 	struct completion completion;
@@ -344,7 +347,7 @@ static int sx9310_read_prox_data(struct sx9310_data *data,
 	if (ret < 0)
 		return ret;
 
-	return regmap_bulk_read(data->regmap, chan->address, val, 2);
+	return regmap_bulk_read(data->regmap, chan->address, val, sizeof(*val));
 }
 
 /*
@@ -694,10 +697,10 @@ static irqreturn_t sx9310_trigger_handler(int irq, void *private)
 		if (ret < 0)
 			goto out;
 
-		data->buffer[i++] = val;
+		data->buffer.channels[i++] = val;
 	}
 
-	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
+	iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer,
 					   pf->timestamp);
 
 out: