[PATCH 5.18 0645/1095] iio: dac: ti-dac082s085: Fix alignment for DMA safety

Greg Kroah-Hartman
2022-08-15T21:42:08Z

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

[ Upstream commit 03a0cc77f164e4e59b970d50c6e9a6caf06dae80 ]

____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: 61011264c1af ("iio: dac: Add Texas Instruments 8/10/12-bit 2/4-channel DAC driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-62-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/dac/ti-dac082s085.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ti-dac082s085.c b/drivers/iio/dac/ti-dac082s085.c
index 4e1156e6deb2..f52ad8fa7747 100644
--- a/drivers/iio/dac/ti-dac082s085.c
+++ b/drivers/iio/dac/ti-dac082s085.c
@@ -55,7 +55,7 @@ struct ti_dac_chip {
bool powerdown;
u8 powerdown_mode;
u8 resolution;
- u8 buf[2] ____cacheline_aligned;
+ u8 buf[2] __aligned(IIO_DMA_MINALIGN);
};

#define WRITE_NOT_UPDATE(chan) (0x00 | (chan) << 6)
--
2.35.1