linux-kernel - [PATCH 5.19 0718/1157] iio: temp: max31865: Fix alignment for DMA safety

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Date:   Mon, 15 Aug 2022 20:01:14 +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>,
        Navin Sankar Velliangiri <navin@...umiz.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0718/1157] iio: temp: max31865: Fix alignment for DMA safety

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

[ Upstream commit ecdef5b8317cdf18acb46223e087f04a226fa619 ]

____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: e112dc4e18ea ("iio: temperature: Add MAX31865 RTD Support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Navin Sankar Velliangiri <navin@...umiz.com>
Acked-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20220508175712.647246-92-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/temperature/max31865.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/temperature/max31865.c b/drivers/iio/temperature/max31865.c
index e3bb78184c6e..29e23652ba5a 100644
--- a/drivers/iio/temperature/max31865.c
+++ b/drivers/iio/temperature/max31865.c
@@ -55,7 +55,7 @@ struct max31865_data {
 	struct mutex lock;
 	bool filter_50hz;
 	bool three_wire;
-	u8 buf[2] ____cacheline_aligned;
+	u8 buf[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 static int max31865_read(struct max31865_data *data, u8 reg,
-- 
2.35.1