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authorJonathan Cameron <Jonathan.Cameron@huawei.com>2022-05-08 20:57:03 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2022-06-14 13:53:19 +0300
commitc5f78f4d2168ba21324095b0d46d4353c2eace4d (patch)
treece3ebc080173689344d25cffc1bb467f6dd9346d /drivers/iio/potentiometer
parentec1ac1c0e7a14657d729159ccfbea72f434bdaf1 (diff)
downloadlinux-c5f78f4d2168ba21324095b0d46d4353c2eace4d.tar.xz
iio: potentiometer: mcp41010: Fix alignment for DMA safety
____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
Diffstat (limited to 'drivers/iio/potentiometer')
-rw-r--r--drivers/iio/potentiometer/mcp41010.c2
1 files changed, 1 insertions, 1 deletions
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) { \