linux-kernel - [PATCH 5.19 0676/1157] iio: dac: ad5504: Fix alignment for DMA safety

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Message-Id: <20220815180506.725671223@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:00:32 +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 0676/1157] iio: dac: ad5504: Fix alignment for DMA safety

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

[ Upstream commit 00b9737caa5aaed5cf45a7c7498edf5957efa3b2 ]

____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: 0dbe59c7a788 ("iio:ad5504: Do not store transfer buffers on the stack")
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/20220508175712.647246-48-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/dac/ad5504.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ad5504.c b/drivers/iio/dac/ad5504.c
index a0817e799cc0..e6c5be728bb2 100644
--- a/drivers/iio/dac/ad5504.c
+++ b/drivers/iio/dac/ad5504.c
@@ -54,7 +54,7 @@ struct ad5504_state {
 	unsigned			pwr_down_mask;
 	unsigned			pwr_down_mode;
 
-	__be16				data[2] ____cacheline_aligned;
+	__be16				data[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 /*
-- 
2.35.1