linux-kernel - [PATCH 5.18 0640/1095] iio: dac: ad7293: Fix alignment for DMA safety

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Message-Id: <20220815180455.873915128@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:00:39 +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>,
        Antoniu Miclaus <antoniu.miclaus@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0640/1095] iio: dac: ad7293: Fix alignment for DMA safety

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

[ Upstream commit 8482468b30bdb16d4a764f995d7a63d94fa0cf40 ]

____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: 0bb12606c05f ("iio:dac:ad7293: add support for AD7293")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Antoniu Miclaus <antoniu.miclaus@...log.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-57-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/dac/ad7293.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ad7293.c b/drivers/iio/dac/ad7293.c
index 59a38ca4c3c7..06f05750d921 100644
--- a/drivers/iio/dac/ad7293.c
+++ b/drivers/iio/dac/ad7293.c
@@ -144,7 +144,7 @@ struct ad7293_state {
 	struct regulator *reg_avdd;
 	struct regulator *reg_vdrive;
 	u8 page_select;
-	u8 data[3] ____cacheline_aligned;
+	u8 data[3] __aligned(IIO_DMA_MINALIGN);
 };
 
 static int ad7293_page_select(struct ad7293_state *st, unsigned int reg)
-- 
2.35.1