iio: dac: mcp4922: Fix alignment for DMA safety

____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: 1b791fadf3a1 ("iio: dac: mcp4902/mcp4912/mcp4922 dac driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Acked-by: Michael Welling <mwelling@ieee.org>
Link: https://lore.kernel.org/r/20220508175712.647246-61-jic23@kernel.org

diff --git a/drivers/iio/dac/mcp4922.c b/drivers/iio/dac/mcp4922.c
index cb9e60e..6c0e310 100644 (file)
--- a/drivers/iio/dac/mcp4922.c
+++ b/drivers/iio/dac/mcp4922.c
@@ -29,7 +29,7 @@ struct mcp4922_state {
        unsigned int value[MCP4922_NUM_CHANNELS];
        unsigned int vref_mv;
        struct regulator *vref_reg;
-       u8 mosi[2] ____cacheline_aligned;
+       u8 mosi[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 #define MCP4922_CHAN(chan, bits) {                     \