linux-kernel - [PATCH 4.19 184/421] iio: potentiostat: lmp91000: Fix alignment of buffer in iio_push_to_buffers_with

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Message-Id: <20210719144952.802599953@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:49:55 +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>,
        Matt Ranostay <matt.ranostay@...sulko.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 184/421] iio: potentiostat: lmp91000: Fix alignment of buffer in iio_push_to_buffers_with_timestamp()

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

[ Upstream commit 8979b67ec61abc232636400ee8c758a16a73c95f ]

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.

Here structure is not used, because this buffer is also used
elsewhere in the driver.

Fixes: 67e17300dc1d ("iio: potentiostat: add LMP91000 support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Matt Ranostay <matt.ranostay@...sulko.com>
Acked-by: Matt Ranostay <matt.ranostay@...sulko.com>
Link: https://lore.kernel.org/r/20210501171352.512953-8-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/potentiostat/lmp91000.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/potentiostat/lmp91000.c b/drivers/iio/potentiostat/lmp91000.c
index 90e895adf997..68f4f6fa27da 100644
--- a/drivers/iio/potentiostat/lmp91000.c
+++ b/drivers/iio/potentiostat/lmp91000.c
@@ -71,8 +71,8 @@ struct lmp91000_data {
 
 	struct completion completion;
 	u8 chan_select;
-
-	u32 buffer[4]; /* 64-bit data + 64-bit timestamp */
+	/* 64-bit data + 64-bit naturally aligned timestamp */
+	u32 buffer[4] __aligned(8);
 };
 
 static const struct iio_chan_spec lmp91000_channels[] = {
-- 
2.30.2