iio: adc: max1118: Fix alignment for DMA safety

[ 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>

diff --git a/drivers/iio/adc/max1118.c b/drivers/iio/adc/max1118.c
index a41bc570be210af7c08fb20591f55b43d9ac4455..75ab57d9aef74e44be208105e37ddb2fbcc34da5 100644 (file)
--- 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)                                            \