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| author | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-05-08 18:56:25 +0100 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-06-14 11:53:15 +0100 |
| commit | d2b240d3d31c66df4d2da54c75ff8e27a0e006c3 (patch) | |
| tree | 49dec4359035fc854c624d1397b24d2839c7cb08 /drivers/iio/dac | |
| parent | 94ec314e1bd686b669c24385ce2dbc967eb74147 (diff) | |
| download | linux-d2b240d3d31c66df4d2da54c75ff8e27a0e006c3.tar.bz2 | |
iio: dac: ad5421: 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.
Update the comment to include 'may'.
Fixes: 5691b23489db ("staging:iio:dac: Add AD5421 driver")
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/20220508175712.647246-46-jic23@kernel.org
Diffstat (limited to 'drivers/iio/dac')
| -rw-r--r-- | drivers/iio/dac/ad5421.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/dac/ad5421.c b/drivers/iio/dac/ad5421.c index eedf661d32b2..7644acfd879e 100644 --- a/drivers/iio/dac/ad5421.c +++ b/drivers/iio/dac/ad5421.c @@ -72,13 +72,13 @@ struct ad5421_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); }; static const struct iio_event_spec ad5421_current_event[] = { |