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| author | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-05-08 20:56:02 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-06-14 13:53:13 +0300 |
| commit | 6ebf401d555ee1e75e779b865d38e171db0aa1f2 (patch) | |
| tree | e6540313b266548509fef763a53e1b5b3e7c9f96 /drivers/iio/adc/ltc2497.c | |
| parent | 1673b7ca2dc1fb3b8d7c94a112496c02d34ae449 (diff) | |
| download | linux-6ebf401d555ee1e75e779b865d38e171db0aa1f2.tar.xz | |
iio: adc: ltc2497: 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: bc82222fcca1 ("iio:adc: Driver for Linear Technology LTC2497 ADC")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-23-jic23@kernel.org
Diffstat (limited to 'drivers/iio/adc/ltc2497.c')
| -rw-r--r-- | drivers/iio/adc/ltc2497.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c index 1adddf5a88a9..f7c786f37ceb 100644 --- a/drivers/iio/adc/ltc2497.c +++ b/drivers/iio/adc/ltc2497.c @@ -20,10 +20,10 @@ struct ltc2497_driverdata { struct ltc2497core_driverdata common_ddata; struct i2c_client *client; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ - __be32 buf ____cacheline_aligned; + __be32 buf __aligned(IIO_DMA_MINALIGN); }; static int ltc2497_result_and_measure(struct ltc2497core_driverdata *ddata, |