iio: adc: ti-ads8688: Fix alignment of buffer in iio_push_to_buffers_with_timestamp()

BugLink: https://bugs.launchpad.net/bugs/1938340
[ Upstream commit 61fa5dfa5f52806f5ce37a0ba5712c271eb22f98 ]

Add __aligned(8) to ensure the buffer passed to
iio_push_to_buffers_with_timestamp() is suitable for the naturally
aligned timestamp that will be inserted.

Fixes: f214ff521fb1 ("iio: ti-ads8688: Update buffer allocation for timestamps")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210613152301.571002-5-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/iio/adc/ti-ads8688.c b/drivers/iio/adc/ti-ads8688.c
index 16bcb37eebb721236eefd6f1510267f74093d338..79c803537dc4233be7aa6c044cf2c8a63dd53879 100644 (file)
--- a/drivers/iio/adc/ti-ads8688.c
+++ b/drivers/iio/adc/ti-ads8688.c
@@ -383,7 +383,8 @@ static irqreturn_t ads8688_trigger_handler(int irq, void *p)
 {
        struct iio_poll_func *pf = p;
        struct iio_dev *indio_dev = pf->indio_dev;
-       u16 buffer[ADS8688_MAX_CHANNELS + sizeof(s64)/sizeof(u16)];
+       /* Ensure naturally aligned timestamp */
+       u16 buffer[ADS8688_MAX_CHANNELS + sizeof(s64)/sizeof(u16)] __aligned(8);
        int i, j = 0;
 
        for (i = 0; i < indio_dev->masklength; i++) {