iio: dac: ti-dac7311: Fix alignment for DMA safety

[ 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>

diff --git a/drivers/iio/dac/ti-dac7311.c b/drivers/iio/dac/ti-dac7311.c
index e10d17e60ed39f02e57f77e78affd3f45fd53758..dd0a7b77838da91ad041d4d3a6b44c4414620062 100644 (file)
--- 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)