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| author | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-05-08 18:56:09 +0100 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-06-14 11:53:14 +0100 |
| commit | bb102fd600d1d6c0020a4514197c0604c4a218d9 (patch) | |
| tree | 54b13d3679044ac4d751746f2870175bb32d7d70 | |
| parent | 1e6bb81c23a84a078736a0f2a52bd765863e94ed (diff) | |
| download | linux-bb102fd600d1d6c0020a4514197c0604c4a218d9.tar.gz linux-bb102fd600d1d6c0020a4514197c0604c4a218d9.tar.bz2 linux-bb102fd600d1d6c0020a4514197c0604c4a218d9.zip | |
iio: adc: ti-adc084s021: 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: 3691e5a69449 ("iio: adc: add driver for the ti-adc084s021 chip")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Acked-by: Mårten Lindahl <marten.lindahl@axis.com>
Link: https://lore.kernel.org/r/20220508175712.647246-30-jic23@kernel.org
| -rw-r--r-- | drivers/iio/adc/ti-adc084s021.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/adc/ti-adc084s021.c b/drivers/iio/adc/ti-adc084s021.c index c9b5d9aec3dc..1f6e53832e06 100644 --- a/drivers/iio/adc/ti-adc084s021.c +++ b/drivers/iio/adc/ti-adc084s021.c @@ -32,10 +32,10 @@ struct adc084s021 { s64 ts __aligned(8); } scan; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache line. */ - u16 tx_buf[4] ____cacheline_aligned; + u16 tx_buf[4] __aligned(IIO_DMA_MINALIGN); __be16 rx_buf[5]; /* First 16-bits are trash */ }; |