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authorJonathan Cameron <Jonathan.Cameron@huawei.com>2022-05-08 20:56:21 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2022-06-14 13:53:15 +0300
commit026bffa458d029a5f15ac3f82a9bb0f64aca403d (patch)
tree2a58c8b39764a6c046be95b29f1b3490cef514eb /drivers/iio/amplifiers
parent00eb2b8a077062557772234019ecd6045b8b6298 (diff)
downloadlinux-026bffa458d029a5f15ac3f82a9bb0f64aca403d.tar.xz
iio: amplifiers: ad8366: 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: e71d42e03c60 ("iio: amplifiers: New driver for AD8366 Dual-Digital Variable Gain Amplifier") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Acked-by: Nuno Sá <nuno.sa@analog.com> Link: https://lore.kernel.org/r/20220508175712.647246-42-jic23@kernel.org
Diffstat (limited to 'drivers/iio/amplifiers')
-rw-r--r--drivers/iio/amplifiers/ad8366.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index 1134ae12e531..f2c2ea79a07f 100644
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -45,10 +45,10 @@ struct ad8366_state {
enum ad8366_type type;
struct ad8366_info *info;
/*
- * DMA (thus cache coherency maintenance) requires the
+ * DMA (thus cache coherency maintenance) may require the
* transfer buffers to live in their own cache lines.
*/
- unsigned char data[2] ____cacheline_aligned;
+ unsigned char data[2] __aligned(IIO_DMA_MINALIGN);
};
static struct ad8366_info ad8366_infos[] = {