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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        =?UTF-8?q?Nuno=20S=C3=A1?= <nuno.sa@analog.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.18 0639/1095] iio: dac: ad5791: Fix alignment for DMA saftey
Date:   Mon, 15 Aug 2022 20:00:38 +0200
Message-Id: <20220815180455.835723881@linuxfoundation.org>
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From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

[ Upstream commit b2d5e9de77c8774a5a6cff59d928f2fa38cbc642 ]

____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: 791bb52a0cd2 ("iio:ad5791: Do not store transfer buffers on the stack")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-56-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/dac/ad5791.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ad5791.c b/drivers/iio/dac/ad5791.c
index 2b14914b4050..ee7e89774d9d 100644
--- a/drivers/iio/dac/ad5791.c
+++ b/drivers/iio/dac/ad5791.c
@@ -95,7 +95,7 @@ struct ad5791_state {
 	union {
 		__be32 d32;
 		u8 d8[4];
-	} data[3] ____cacheline_aligned;
+	} data[3] __aligned(IIO_DMA_MINALIGN);
 };
 
 enum ad5791_supported_device_ids {
-- 
2.35.1