iio: adc: ad7768-1: Fix too small buffer passed to iio_push_to_buffers_with_timestamp()

Add space for the timestamp to be inserted.  Also ensure correct
alignment for passing to iio_push_to_buffers_with_timestamp()

Fixes: a5f8c7da3dbe ("iio: adc: Add AD7768-1 ADC basic support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210501165314.511954-2-jic23@kernel.org
Cc: <Stable@vger.kernel.org>

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index c945f1349623f7ad7f58069710ed02565f022af5..60f21fed6dcbe1a8c69336c0dbe3b3452d2be923 100644 (file)
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -167,6 +167,10 @@ struct ad7768_state {
         * transfer buffers to live in their own cache lines.
         */
        union {
+               struct {
+                       __be32 chan;
+                       s64 timestamp;
+               } scan;
                __be32 d32;
                u8 d8[2];
        } data ____cacheline_aligned;
@@ -469,11 +473,11 @@ static irqreturn_t ad7768_trigger_handler(int irq, void *p)
 
        mutex_lock(&st->lock);
 
-       ret = spi_read(st->spi, &st->data.d32, 3);
+       ret = spi_read(st->spi, &st->data.scan.chan, 3);
        if (ret < 0)
                goto err_unlock;
 
-       iio_push_to_buffers_with_timestamp(indio_dev, &st->data.d32,
+       iio_push_to_buffers_with_timestamp(indio_dev, &st->data.scan,
                                           iio_get_time_ns(indio_dev));
 
        iio_trigger_notify_done(indio_dev->trig);