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iio: potentiometer: mcp4131: Fix alignment for DMA safety

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[ Upstream commit 4842e5de6f39ebf2c0f6da9e6a0cb751c7108507 ]

____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: 22d199a53910 ("iio: potentiometer: add driver for Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-85-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jonathan Cameron 2022-05-08 18:57:04 +01:00 committed by Greg Kroah-Hartman
parent 51143f6675
commit 5179a57372
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/potentiometer/mcp4131.c
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@ -129,7 +129,7 @@ struct mcp4131_data {
struct spi_device *spi;
const struct mcp4131_cfg *cfg;
struct mutex lock;
u8 buf[2] ____cacheline_aligned;
u8 buf[2] __aligned(IIO_DMA_MINALIGN);
};
#define MCP4131_CHANNEL(ch) { \