linux-kernel - [PATCH 5.18 0665/1095] iio: potentiometer: ad5272: Fix alignment for DMA safety

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Message-Id: <20220815180456.906096386@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:01:04 +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>,
        Phil Reid <preid@...ctromag.com.au>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0665/1095] iio: potentiometer: ad5272: Fix alignment for DMA safety

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

[ Upstream commit da803652534271dbb4af0802bd678c759e27e6de ]

____cacheline_aligned is an insufficient guarantee for non-coherent DMA
on platforms with 128 byte cachelines above L1.  Switch to the updated
IIO_DMA_MINALIGN definition.

Fixes: 79e8a32d2aa9 ("iio: ad5272: Add support for Analog Devices digital potentiometers")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Phil Reid <preid@...ctromag.com.au>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-82-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/potentiometer/ad5272.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/potentiometer/ad5272.c b/drivers/iio/potentiometer/ad5272.c
index d8cbd170262f..ed5fc0b50fe9 100644
--- a/drivers/iio/potentiometer/ad5272.c
+++ b/drivers/iio/potentiometer/ad5272.c
@@ -50,7 +50,7 @@ struct ad5272_data {
 	struct i2c_client       *client;
 	struct mutex            lock;
 	const struct ad5272_cfg *cfg;
-	u8                      buf[2] ____cacheline_aligned;
+	u8                      buf[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 static const struct iio_chan_spec ad5272_channel = {
-- 
2.35.1