[PATCH 5.19 0654/1157] iio: adc: max1118: Fix alignment for DMA safety

Greg Kroah-Hartman
2022-08-16T04:36:32Z

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

[ Upstream commit f746ab0bac5b335b09143dcd01db6f9f26d0c9ec ]

____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: a9e9c7153e96 ("iio: adc: add max1117/max1118/max1119 ADC driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-26-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/adc/max1118.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/max1118.c b/drivers/iio/adc/max1118.c
index a41bc570be21..75ab57d9aef7 100644
--- a/drivers/iio/adc/max1118.c
+++ b/drivers/iio/adc/max1118.c
@@ -42,7 +42,7 @@ struct max1118 {
s64 ts __aligned(8);
} scan;

- u8 data ____cacheline_aligned;
+ u8 data __aligned(IIO_DMA_MINALIGN);
};

#define MAX1118_CHANNEL(ch) \
--
2.35.1