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    Subject[PATCH 5.19 0713/1157] iio: potentiometer: mcp4131: Fix alignment for DMA safety
    Date
    From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

    [ 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>
    ---
    drivers/iio/potentiometer/mcp4131.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/iio/potentiometer/mcp4131.c b/drivers/iio/potentiometer/mcp4131.c
    index 7c8c18ab8764..7890c0993ec4 100644
    --- a/drivers/iio/potentiometer/mcp4131.c
    +++ b/drivers/iio/potentiometer/mcp4131.c
    @@ -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) { \
    --
    2.35.1


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