[PATCH 5.19 0719/1157] iio: temp: maxim_thermocouple: Fix alignment for DMA safety

Greg Kroah-Hartman
2022-08-16T00:15:20Z

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

[ Upstream commit 10897f34309b3c7bc14698407436c82d11c07f47 ]

____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: 1f25ca11d84a ("iio: temperature: add support for Maxim thermocouple chips")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Matt Ranostay <mranostay@gmail.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-93-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/temperature/maxim_thermocouple.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/temperature/maxim_thermocouple.c b/drivers/iio/temperature/maxim_thermocouple.c
index 98c41cddc6f0..c28a7a6dea5f 100644
--- a/drivers/iio/temperature/maxim_thermocouple.c
+++ b/drivers/iio/temperature/maxim_thermocouple.c
@@ -122,7 +122,7 @@ struct maxim_thermocouple_data {
struct spi_device *spi;
const struct maxim_thermocouple_chip *chip;

- u8 buffer[16] ____cacheline_aligned;
+ u8 buffer[16] __aligned(IIO_DMA_MINALIGN);
char tc_type;
};

--
2.35.1