iio: adc: vf610: 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: 0010d6b44406 ("iio: adc: vf610: Add IIO buffer support for Vybrid ADC")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Stefan-Gabriel Mirea <stefan-gabriel.mirea@nxp.com>
Cc: Sanchayan Maity <maitysanchayan@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210501170121.512209-10-jic23@kernel.org

diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index 1d794cf..fd57fc4 100644 (file)
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -167,7 +167,11 @@ struct vf610_adc {
        u32 sample_freq_avail[5];
 
        struct completion completion;
-       u16 buffer[8];
+       /* Ensure the timestamp is naturally aligned */
+       struct {
+               u16 chan;
+               s64 timestamp __aligned(8);
+       } scan;
 };
 
 static const u32 vf610_hw_avgs[] = { 1, 4, 8, 16, 32 };
@@ -579,9 +583,9 @@ static irqreturn_t vf610_adc_isr(int irq, void *dev_id)
        if (coco & VF610_ADC_HS_COCO0) {
                info->value = vf610_adc_read_data(info);
                if (iio_buffer_enabled(indio_dev)) {
-                       info->buffer[0] = info->value;
+                       info->scan.chan = info->value;
                        iio_push_to_buffers_with_timestamp(indio_dev,
-                                       info->buffer,
+                                       &info->scan,
                                        iio_get_time_ns(indio_dev));
                        iio_trigger_notify_done(indio_dev->trig);
                } else