[PATCH 5.19 0676/1157] iio: dac: ad5504: Fix alignment for DMA safety

Greg Kroah-Hartman
2022-08-16T00:14:22Z

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

[ Upstream commit 00b9737caa5aaed5cf45a7c7498edf5957efa3b2 ]

____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.

Fixes: 0dbe59c7a788 ("iio:ad5504: Do not store transfer buffers on the stack")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-48-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/dac/ad5504.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ad5504.c b/drivers/iio/dac/ad5504.c
index a0817e799cc0..e6c5be728bb2 100644
--- a/drivers/iio/dac/ad5504.c
+++ b/drivers/iio/dac/ad5504.c
@@ -54,7 +54,7 @@ struct ad5504_state {
unsigned pwr_down_mask;
unsigned pwr_down_mode;

- __be16 data[2] ____cacheline_aligned;
+ __be16 data[2] __aligned(IIO_DMA_MINALIGN);
};

/*
--
2.35.1