[PATCH 5.18 0665/1095] iio: potentiometer: ad5272: Fix alignment for DMA safety

Greg Kroah-Hartman
2022-08-15T21:51:50Z

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

[ Upstream commit da803652534271dbb4af0802bd678c759e27e6de ]

____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
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 = {
--
2.35.1