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iio: adc: ad7298: Fix alignment for DMA safety

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____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: be7fd3b86a ("iio:adc:ad7298 make the tx and rx buffers __be16")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-13-jic23@kernel.org
This commit is contained in:
Jonathan Cameron 2022-05-08 18:55:52 +01:00
parent 98295a206d
commit 585c9772f8
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/adc/ad7298.c
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@ -49,7 +49,7 @@ struct ad7298_state {
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
*/
__be16 rx_buf[12] ____cacheline_aligned;
__be16 rx_buf[12] __aligned(IIO_DMA_MINALIGN);
__be16 tx_buf[2];
};