Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.19 0712/1157] iio: potentiometer: mcp41010: Fix alignment for DMA safety | Date | Mon, 15 Aug 2022 20:01:08 +0200 |
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From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
[ Upstream commit c5f78f4d2168ba21324095b0d46d4353c2eace4d ]
____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: 092cb71a604e ("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 Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/iio/potentiometer/mcp41010.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/potentiometer/mcp41010.c b/drivers/iio/potentiometer/mcp41010.c index 30a4594d4e11..2b73c7540209 100644 --- a/drivers/iio/potentiometer/mcp41010.c +++ b/drivers/iio/potentiometer/mcp41010.c @@ -60,7 +60,7 @@ struct mcp41010_data { const struct mcp41010_cfg *cfg; struct mutex lock; /* Protect write sequences */ 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) { \ -- 2.35.1
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