From da803652534271dbb4af0802bd678c759e27e6de Mon Sep 17 00:00:00 2001

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

Date: Sun, 8 May 2022 18:57:01 +0100

Subject: [PATCH] iio: potentiometer: ad5272: Fix alignment for DMA safety

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Git-commit: da803652534271dbb4af0802bd678c759e27e6de

Patch-mainline: v6.0-rc1

References: git-fixes

____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: 79e8a32d2aa9 ("iio: ad5272: Add support for Analog Devices digital potentiometers")

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Reviewed-by: Phil Reid <preid@electromag.com.au>

Acked-by: Nuno Sá <nuno.sa@analog.com>

Link: https://lore.kernel.org/r/20220508175712.647246-82-jic23@kernel.org

Acked-by: Takashi Iwai <tiwai@suse.de>

---

 drivers/iio/potentiometer/ad5272.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/potentiometer/ad5272.c b/drivers/iio/potentiometer/ad5272.c

index d8cbd170262f..ed5fc0b50fe9 100644

--- a/drivers/iio/potentiometer/ad5272.c

+++ b/drivers/iio/potentiometer/ad5272.c

@@ -50,7 +50,7 @@ struct ad5272_data {

 	struct i2c_client       *client;

 	struct mutex            lock;

 	const struct ad5272_cfg *cfg;

-	u8                      buf[2] ____cacheline_aligned;

+	u8                      buf[2] __aligned(IIO_DMA_MINALIGN);

 };

 static const struct iio_chan_spec ad5272_channel = {

-- 

2.35.3