[PATCH 5.19 0692/1157] iio: dac: ti-dac7311: Fix alignment for DMA safety

Greg Kroah-Hartman
2022-08-16T00:17:29Z

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

[ Upstream commit 3637c49ed54632d7c221af718d2d7b1d381d4b6e ]

____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: 7a02ef7907d8 ("iio:dac:ti-dac7311 Add driver for Texas Instrument DAC7311")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Charles-Antoine Couret <charles-antoine.couret@essensium.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-64-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iio/dac/ti-dac7311.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/dac/ti-dac7311.c b/drivers/iio/dac/ti-dac7311.c
index 4afc411725d9..7f89d2a52f49 100644
--- a/drivers/iio/dac/ti-dac7311.c
+++ b/drivers/iio/dac/ti-dac7311.c
@@ -52,7 +52,7 @@ struct ti_dac_chip {
bool powerdown;
u8 powerdown_mode;
u8 resolution;
- u8 buf[2] ____cacheline_aligned;
+ u8 buf[2] __aligned(IIO_DMA_MINALIGN);
};

static u8 ti_dac_get_power(struct ti_dac_chip *ti_dac, bool powerdown)
--
2.35.1