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[4.14,135/315] iio: light: tcs3414: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

Message ID 20210719144947.315411748@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman July 19, 2021, 2:50 p.m. UTC 
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(-)

-- 
2.30.2
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Patch

diff --git a/drivers/iio/light/tcs3414.c b/drivers/iio/light/tcs3414.c
index a795afb7667b..b51cd43ef824 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: