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iio: potentiometer: mcp41010: Fix alignment for DMA safety

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____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: 092cb71a60 ("iio: potentiometer: Add driver for Microchip MCP41xxx/42xxx")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-84-jic23@kernel.org
This commit is contained in:
Jonathan Cameron 2022-05-08 18:57:03 +01:00
parent ec1ac1c0e7
commit c5f78f4d21
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/potentiometer/mcp41010.c
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@ -60,7 +60,7 @@ struct mcp41010_data {
const struct mcp41010_cfg *cfg; const struct mcp41010_cfg *cfg;
struct mutex lock; /* Protect write sequences */ struct mutex lock; /* Protect write sequences */
unsigned int value[MCP41010_MAX_WIPERS]; /* Cache wiper values */ unsigned int value[MCP41010_MAX_WIPERS]; /* Cache wiper values */
u8 buf[2] ____cacheline_aligned; u8 buf[2] __aligned(IIO_DMA_MINALIGN);
}; };
#define MCP41010_CHANNEL(ch) { \ #define MCP41010_CHANNEL(ch) { \