linux-kernel - [PATCH 5.18 0610/1095] iio: adc: max1241: Fix alignment for DMA safety

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Message-Id: <20220815180454.743090611@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:00:09 +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>,
        Alexandru Lazar <alazar@...rtmail.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0610/1095] iio: adc: max1241: Fix alignment for DMA safety

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

[ Upstream commit 9d7019e43ee67a48cef63f8f23f002233064d390 ]

____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: 8a80a71d9020 ("iio: adc: Add MAX1241 driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Alexandru Lazar <alazar@...rtmail.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-27-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/max1241.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/max1241.c b/drivers/iio/adc/max1241.c
index a5afd84af58b..a815ad1f6913 100644
--- a/drivers/iio/adc/max1241.c
+++ b/drivers/iio/adc/max1241.c
@@ -26,7 +26,7 @@ struct max1241 {
 	struct regulator *vref;
 	struct gpio_desc *shutdown;
 
-	__be16 data ____cacheline_aligned;
+	__be16 data __aligned(IIO_DMA_MINALIGN);
 };
 
 static const struct iio_chan_spec max1241_channels[] = {
-- 
2.35.1