This is a note to let you know that I've just added the patch titled
iio: potentiometer: max5481: 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-potentiometer-max5481-fix-alignment-for-dma-safe.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 99581b22e68e918c2846a4610280c89610b02079
Author: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Date: Sun May 8 18:57:02 2022 +0100
iio: potentiometer: max5481: Fix alignment for DMA safety
[ Upstream commit ec1ac1c0e7a14657d729159ccfbea72f434bdaf1 ]
____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: df1fd2de118e ("iio: max5481: Add support for Maxim digital potentiometers")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220508175712.647246-83-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/potentiometer/max5481.c b/drivers/iio/potentiometer/max5481.c
index 098d144a8fdd..b40e5ac218d7 100644
--- a/drivers/iio/potentiometer/max5481.c
+++ b/drivers/iio/potentiometer/max5481.c
@@ -44,7 +44,7 @@ static const struct max5481_cfg max5481_cfg[] = {
struct max5481_data {
struct spi_device *spi;
const struct max5481_cfg *cfg;
- u8 msg[3] ____cacheline_aligned;
+ u8 msg[3] __aligned(IIO_DMA_MINALIGN);
};
#define MAX5481_CHANNEL { \
