linux-kernel - [PATCH 5.18 0642/1095] iio: dac: ad8801: Fix alignment for DMA safety

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Date:   Mon, 15 Aug 2022 20:00:41 +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>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0642/1095] iio: dac: ad8801: Fix alignment for DMA safety

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

[ Upstream commit 1c20292c6b60cfc60a5e652174b8063e5cc03fec ]

____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: 7f270bc9a2d9 ("iio: dac: AD8801: add Analog Devices AD8801/AD8803 support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-59-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/dac/ad8801.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ad8801.c b/drivers/iio/dac/ad8801.c
index 6be35c92d435..919e8c880697 100644
--- a/drivers/iio/dac/ad8801.c
+++ b/drivers/iio/dac/ad8801.c
@@ -26,7 +26,7 @@ struct ad8801_state {
 	struct regulator *vrefh_reg;
 	struct regulator *vrefl_reg;
 
-	__be16 data ____cacheline_aligned;
+	__be16 data __aligned(IIO_DMA_MINALIGN);
 };
 
 static int ad8801_spi_write(struct ad8801_state *state,
-- 
2.35.1