From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
____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.
Worth noting the fixes tag refers to the same issue being observed
on a platform that probably had only 64 byte cachelines.
Fixes: 0e81bc99a082 ("iio: mcp320x: Fix occasional incorrect readings")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Michael Welling <mwelling@xxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
---
drivers/iio/adc/mcp320x.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c
index b4c69acb33e3..f3b81798b3c9 100644
--- a/drivers/iio/adc/mcp320x.c
+++ b/drivers/iio/adc/mcp320x.c
@@ -92,7 +92,7 @@ struct mcp320x {
struct mutex lock;
const struct mcp320x_chip_info *chip_info;
- u8 tx_buf ____cacheline_aligned;
+ u8 tx_buf __aligned(IIO_DMA_MINALIGN);
u8 rx_buf[4];
};
--
2.36.0
