iio: temp: max31865: 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: e112dc4e18ea ("iio: temperature: Add MAX31865 RTD Support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Navin Sankar Velliangiri <navin@linumiz.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-92-jic23@kernel.org

Jonathan Cameron 3 years ago ecdef5b8 732f2cb2

+1 -1

1 changed file

expand all

drivers

iio

temperature

max31865.c

+1 -1

drivers/iio/temperature/max31865.c

··· 55 55 struct mutex lock; 56 56 bool filter_50hz; 57 57 bool three_wire; 58 - u8 buf[2] ____cacheline_aligned; 58 + u8 buf[2] __aligned(IIO_DMA_MINALIGN); 59 59 }; 60 60 61 61 static int max31865_read(struct max31865_data *data, u8 reg,