linux-kernel - [PATCH 5.19 0675/1157] iio: dac: ad5449: Fix alignment for DMA safety

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Message-Id: <20220815180506.693236219@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:00:31 +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>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0675/1157] iio: dac: ad5449: Fix alignment for DMA safety

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

[ Upstream commit 678d536bb454e3bbedcaa68208550ac9dc1cc066 ]

____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.

Update the comment to include 'may'.

Fixes: 8341dc04dfb3 ("iio:dac: Add support for the ad5449")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-47-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/dac/ad5449.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/dac/ad5449.c b/drivers/iio/dac/ad5449.c
index bad9bdaafa94..4572d6f49275 100644
--- a/drivers/iio/dac/ad5449.c
+++ b/drivers/iio/dac/ad5449.c
@@ -68,10 +68,10 @@ struct ad5449 {
 	uint16_t dac_cache[AD5449_MAX_CHANNELS];
 
 	/*
-	 * DMA (thus cache coherency maintenance) requires the
+	 * DMA (thus cache coherency maintenance) may require the
 	 * transfer buffers to live in their own cache lines.
 	 */
-	__be16 data[2] ____cacheline_aligned;
+	__be16 data[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 enum ad5449_type {
-- 
2.35.1