This is a note to let you know that I've just added the patch titled
iio: temp: max31865: Fix alignment for DMA safety
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-temp-max31865-fix-alignment-for-dma-safety.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b4bbcc567c074a6fe57796820bcdfa485d7733e4
Author: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Date: Sun May 8 18:57:11 2022 +0100
iio: temp: max31865: Fix alignment for DMA safety
[ Upstream commit ecdef5b8317cdf18acb46223e087f04a226fa619 ]
____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@xxxxxxxxxx>
Cc: Navin Sankar Velliangiri <navin@xxxxxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220508175712.647246-92-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/temperature/max31865.c b/drivers/iio/temperature/max31865.c
index 86c3f3509a26..f0079e51d8d2 100644
--- a/drivers/iio/temperature/max31865.c
+++ b/drivers/iio/temperature/max31865.c
@@ -53,7 +53,7 @@ struct max31865_data {
struct mutex lock;
bool filter_50hz;
bool three_wire;
- u8 buf[2] ____cacheline_aligned;
+ u8 buf[2] __aligned(IIO_DMA_MINALIGN);
};
static int max31865_read(struct max31865_data *data, u8 reg,
