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| author | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-05-08 18:56:04 +0100 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-06-14 11:53:13 +0100 |
| commit | 51f30d63145cc84cb8a8e0ec96f9a8b73e6b5448 (patch) | |
| tree | d45bfa35c3783ac9b8ad45ab828736fab6fd0eaf /drivers/iio/adc/max11100.c | |
| parent | e754fb7e7a05e3838c9aa044b4114869dd0d1e17 (diff) | |
| download | linux-51f30d63145cc84cb8a8e0ec96f9a8b73e6b5448.tar.gz linux-51f30d63145cc84cb8a8e0ec96f9a8b73e6b5448.tar.bz2 linux-51f30d63145cc84cb8a8e0ec96f9a8b73e6b5448.zip | |
iio: adc: max11100: 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: a8e7e88df9ec ("iio: adc: Add Maxim MAX11100 driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-25-jic23@kernel.org
Diffstat (limited to 'drivers/iio/adc/max11100.c')
| -rw-r--r-- | drivers/iio/adc/max11100.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/adc/max11100.c b/drivers/iio/adc/max11100.c index eb1ce6a0315c..49e38dca8fe2 100644 --- a/drivers/iio/adc/max11100.c +++ b/drivers/iio/adc/max11100.c @@ -33,10 +33,10 @@ struct max11100_state { struct spi_device *spi; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ - u8 buffer[3] ____cacheline_aligned; + u8 buffer[3] __aligned(IIO_DMA_MINALIGN); }; static const struct iio_chan_spec max11100_channels[] = { |