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[v2,83/92] iio: potentiometer: mcp41010: Fix alignment for DMA safety

Message ID 20220508175712.647246-84-jic23@kernel.org (mailing list archive)
State Accepted
Headers show
Series IIO: Fix alignment of buffers for DMA | expand

Commit Message

Jonathan Cameron May 8, 2022, 5:57 p.m. UTC 
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

____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>
---
 drivers/iio/potentiometer/mcp41010.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

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) {					\