From: Jonathan Cameron Jonathan.Cameron@huawei.com
[ Upstream commit d0c167ceff2d833ee493dd58164dc87bd36e48aa ]
____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: c499d029d805 ("iio:dac: Add ad5755 driver") Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Acked-by: Nuno Sá nuno.sa@analog.com Link: https://lore.kernel.org/r/20220508175712.647246-51-jic23@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iio/dac/ad5755.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/dac/ad5755.c b/drivers/iio/dac/ad5755.c index 1a63b8456725..beadfa938d2d 100644 --- a/drivers/iio/dac/ad5755.c +++ b/drivers/iio/dac/ad5755.c @@ -189,14 +189,14 @@ struct ad5755_state { struct mutex lock;
/* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */
union { __be32 d32; u8 d8[4]; - } data[2] ____cacheline_aligned; + } data[2] __aligned(IIO_DMA_MINALIGN); };
enum ad5755_type {