linux-kernel - [PATCH 5.4 309/348] iio: adc: at91-sama5d2: Fix buffer alignment in iio_push_to_buffers_with

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Message-Id: <20210712060744.838644727@linuxfoundation.org>
Date:   Mon, 12 Jul 2021 08:11:33 +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>,
        Eugen Hristev <eugen.hristev@...rochip.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 309/348] iio: adc: at91-sama5d2: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

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

[ Upstream commit 8f884758966259fa8c50c137ac6d4ce9bb7859db ]

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: 5e1a1da0f8c9 ("iio: adc: at91-sama5d2_adc: add hw trigger and buffer support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Eugen Hristev <eugen.hristev@...rochip.com>
Reviewed-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20210613152301.571002-2-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/at91-sama5d2_adc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index bafb9dded0ea..def4abeb47ca 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -400,7 +400,8 @@ struct at91_adc_state {
 	struct at91_adc_dma		dma_st;
 	struct at91_adc_touch		touch_st;
 	struct iio_dev			*indio_dev;
-	u16				buffer[AT91_BUFFER_MAX_HWORDS];
+	/* Ensure naturally aligned timestamp */
+	u16				buffer[AT91_BUFFER_MAX_HWORDS] __aligned(8);
 	/*
 	 * lock to prevent concurrent 'single conversion' requests through
 	 * sysfs.
-- 
2.30.2