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[v2,54/92] iio: dac: ad5770r: Fix alignment for DMA safety

Message ID 20220508175712.647246-55-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: cbbb819837f6 ("iio: dac: ad5770r: Add AD5770R support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Alexandru Tachici <alexandru.tachici@analog.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/iio/dac/ad5770r.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/iio/dac/ad5770r.c b/drivers/iio/dac/ad5770r.c
index 7e2fd32e993a..f66d67402e43 100644
--- a/drivers/iio/dac/ad5770r.c
+++ b/drivers/iio/dac/ad5770r.c
@@ -140,7 +140,7 @@  struct ad5770r_state {
 	bool				ch_pwr_down[AD5770R_MAX_CHANNELS];
 	bool				internal_ref;
 	bool				external_res;
-	u8				transf_buf[2] ____cacheline_aligned;
+	u8				transf_buf[2] __aligned(IIO_DMA_MINALIGN);
 };
 
 static const struct regmap_config ad5770r_spi_regmap_config = {