[PATCH 4.19 182/421] iio: light: tcs3414: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

Greg Kroah-Hartman
2021-07-19T16:17:44Z

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

[ Upstream commit ff08fbc22ab32ccc6690c21b0e5e1d402dcc076f ]

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: a244e7b57f0f ("iio: Add driver for AMS/TAOS tcs3414 digital color sensor")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210501170121.512209-19-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/light/tcs3414.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/light/tcs3414.c b/drivers/iio/light/tcs3414.c
index 205e5659ce6b..c525420e7c62 100644
--- a/drivers/iio/light/tcs3414.c
+++ b/drivers/iio/light/tcs3414.c
@@ -56,7 +56,11 @@ struct tcs3414_data {
u8 control;
u8 gain;
u8 timing;
- u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
+ /* Ensure timestamp is naturally aligned */
+ struct {
+ u16 chans[4];
+ s64 timestamp __aligned(8);
+ } scan;
};

#define TCS3414_CHANNEL(_color, _si, _addr) { \
@@ -212,10 +216,10 @@ static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
if (ret < 0)
goto done;

- data->buffer[j++] = ret;
+ data->scan.chans[j++] = ret;
}

- iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
+ iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
iio_get_time_ns(indio_dev));

done:
--
2.30.2