iio: dac: ad5449: Fix alignment for DMA safety

[ Upstream commit 678d536bb454e3bbedcaa68208550ac9dc1cc066 ]

____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.

Update the comment to include 'may'.

Fixes: 8341dc04dfb3 ("iio:dac: Add support for the ad5449")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-47-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iio/dac/ad5449.c b/drivers/iio/dac/ad5449.c
index bad9bdaafa94d62fdd98dc4136afca6e29173914..4572d6f49275f0362b6a8c62e86804240a8739d2 100644 (file)
--- a/drivers/iio/dac/ad5449.c
+++ b/drivers/iio/dac/ad5449.c
@@ -68,10 +68,10 @@ struct ad5449 {
        uint16_t dac_cache[AD5449_MAX_CHANNELS];
 
        /*
-        * DMA (thus cache coherency maintenance) requires the
+        * DMA (thus cache coherency maintenance) may require the
         * transfer buffers to live in their own cache lines.
         */
-       __be16 data[2] ____cacheline_aligned;
+       __be16 data[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 enum ad5449_type {