iio: adc: hi8435: Fix alignment for DMA safety

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

____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: 72aa29ce0a59 ("iio: adc: hi8435: Holt HI-8435 threshold detector")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-21-jic23@kernel.org

Jonathan Cameron 3 years ago 48e4ae96 9c6c7eff

+1 -1

1 changed file

expand all

drivers

iio

adc

hi8435.c

+1 -1

drivers/iio/adc/hi8435.c

··· 49 49 50 50 unsigned threshold_lo[2]; /* GND-Open and Supply-Open thresholds */ 51 51 unsigned threshold_hi[2]; /* GND-Open and Supply-Open thresholds */ 52 - u8 reg_buffer[3] ____cacheline_aligned; 52 + u8 reg_buffer[3] __aligned(IIO_DMA_MINALIGN); 53 53 }; 54 54 55 55 static int hi8435_readb(struct hi8435_priv *priv, u8 reg, u8 *val)