linux-kernel - [PATCH 4.19 199/421] iio: adc: hx711: Fix buffer alignment in iio_push_to_buffers_with

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Message-Id: <20210719144953.282550632@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:50:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Andreas Klinger <ak@...klinger.de>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 199/421] iio: adc: hx711: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

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

[ Upstream commit afe2a789fbf7acd1a05407fc7839cc08d23825e3 ]

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 this function.

Fixes: d3bf60450d47 ("iio: hx711: add triggered buffer support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Andreas Klinger <ak@...klinger.de>
Reviewed-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20210613152301.571002-3-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/hx711.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/hx711.c b/drivers/iio/adc/hx711.c
index 6c5d81a89aec..0dc487dd1674 100644
--- a/drivers/iio/adc/hx711.c
+++ b/drivers/iio/adc/hx711.c
@@ -94,9 +94,9 @@ struct hx711_data {
 	struct mutex		lock;
 	/*
 	 * triggered buffer
-	 * 2x32-bit channel + 64-bit timestamp
+	 * 2x32-bit channel + 64-bit naturally aligned timestamp
 	 */
-	u32			buffer[4];
+	u32			buffer[4] __aligned(8);
 	/*
 	 * delay after a rising edge on SCK until the data is ready DOUT
 	 * this is dependent on the hx711 where the datasheet tells a
-- 
2.30.2