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| author | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-05-08 20:56:44 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-17 16:15:16 +0300 |
| commit | 33fcddee1999dad22cc7b36fdbe282ad73d9ec9b (patch) | |
| tree | 0a1bb6a397f34ed45fd8313527b9142781bcdb89 /drivers/iio/dac | |
| parent | d8aa41f4d8e63ebc688f2589c25387a8728408e4 (diff) | |
| download | linux-33fcddee1999dad22cc7b36fdbe282ad73d9ec9b.tar.xz | |
iio: dac: ti-dac7612: Fix alignment for DMA safety
[ Upstream commit b9ac08b3282a95fcefb057c2886028a6807725d8 ]
____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.
Updated help text to 'may' require buffers to be in their own cacheline.
Fixes: 977724d20584 ("iio:dac:ti-dac7612: Add driver for Texas Instruments DAC7612")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Ricardo Ribalda <ribalda@kernel.org>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-65-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/iio/dac')
| -rw-r--r-- | drivers/iio/dac/ti-dac7612.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/dac/ti-dac7612.c b/drivers/iio/dac/ti-dac7612.c index 4c0f4b5e9ff4..8195815de26f 100644 --- a/drivers/iio/dac/ti-dac7612.c +++ b/drivers/iio/dac/ti-dac7612.c @@ -31,10 +31,10 @@ struct dac7612 { 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. */ - uint8_t data[2] ____cacheline_aligned; + uint8_t data[2] __aligned(IIO_DMA_MINALIGN); }; static int dac7612_cmd_single(struct dac7612 *priv, int channel, u16 val) |