[PATCH 5.19 0655/1157] iio: adc: max1241: Fix alignment for DMA safety

Greg Kroah-Hartman
2022-08-16T04:37:24Z

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

[ Upstream commit 9d7019e43ee67a48cef63f8f23f002233064d390 ]

____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: 8a80a71d9020 ("iio: adc: Add MAX1241 driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Alexandru Lazar <alazar@startmail.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-27-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/adc/max1241.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/max1241.c b/drivers/iio/adc/max1241.c
index a5afd84af58b..a815ad1f6913 100644
--- a/drivers/iio/adc/max1241.c
+++ b/drivers/iio/adc/max1241.c
@@ -26,7 +26,7 @@ struct max1241 {
struct regulator *vref;
struct gpio_desc *shutdown;

- __be16 data ____cacheline_aligned;
+ __be16 data __aligned(IIO_DMA_MINALIGN);
};

static const struct iio_chan_spec max1241_channels[] = {
--
2.35.1