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| author |   Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-05-08 18:56:39 +0100 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-06-14 11:53:17 +0100 |
| commit | 2030708377a219b548a9a36da57d3852382baf1d (patch) | |
| tree | cce71ebdf08b8ce23af9d306b22ac0a54e1f99d6 /drivers/iio/dac/ltc2688.c | |
| parent | iio: dac: ad8801: Fix alignment for DMA safety (diff) | |
| download | wireguard-linux-2030708377a219b548a9a36da57d3852382baf1d.tar.xz wireguard-linux-2030708377a219b548a9a36da57d3852382baf1d.zip | |
iio: dac: ltc2688: 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: 832cb9eeb931 ("iio: dac: add support for ltc2688")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-60-jic23@kernel.org
Diffstat (limited to 'drivers/iio/dac/ltc2688.c')
| -rw-r--r-- | drivers/iio/dac/ltc2688.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/dac/ltc2688.c b/drivers/iio/dac/ltc2688.c index 937b0d25a11c..28bdde2d3088 100644 --- a/drivers/iio/dac/ltc2688.c +++ b/drivers/iio/dac/ltc2688.c @@ -91,10 +91,10 @@ struct ltc2688_state { struct mutex lock; int vref; /* - * 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 tx_data[6] ____cacheline_aligned; + u8 tx_data[6] __aligned(IIO_DMA_MINALIGN); u8 rx_data[3]; }; |