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[v2,70/92] iio: frequency: admv4420: Fix alignment for DMA safety

Message ID 20220508175712.647246-71-jic23@kernel.org (mailing list archive)
State Accepted
Headers show
Series IIO: Fix alignment of buffers for DMA | expand

Commit Message

Jonathan Cameron May 8, 2022, 5:56 p.m. UTC 
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

____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: b59c04155901 ("iio: frequency: admv4420.c: Add support for ADMV4420")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/iio/frequency/admv4420.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/iio/frequency/admv4420.c b/drivers/iio/frequency/admv4420.c
index 51134aee8510..863ba8e98c95 100644
--- a/drivers/iio/frequency/admv4420.c
+++ b/drivers/iio/frequency/admv4420.c
@@ -113,7 +113,7 @@  struct admv4420_state {
 	struct admv4420_n_counter	n_counter;
 	enum admv4420_mux_sel		mux_sel;
 	struct mutex			lock;
-	u8				transf_buf[4] ____cacheline_aligned;
+	u8				transf_buf[4] __aligned(IIO_DMA_MINALIGN);
 };
 
 static const struct regmap_config admv4420_regmap_config = {