This is a note to let you know that I've just added the patch titled
iio: potentiometer: ad5272: 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-ad5272-fix-alignment-for-dma-safet.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 40a3869c91a36100f73d99f3636d63aadea4b736
Author: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Date: Sun May 8 18:57:01 2022 +0100
iio: potentiometer: ad5272: Fix alignment for DMA safety
[ Upstream commit da803652534271dbb4af0802bd678c759e27e6de ]
____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: 79e8a32d2aa9 ("iio: ad5272: Add support for Analog Devices digital potentiometers")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Reviewed-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220508175712.647246-82-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/potentiometer/ad5272.c b/drivers/iio/potentiometer/ad5272.c
index d8cbd170262f..ed5fc0b50fe9 100644
--- a/drivers/iio/potentiometer/ad5272.c
+++ b/drivers/iio/potentiometer/ad5272.c
@@ -50,7 +50,7 @@ struct ad5272_data {
struct i2c_client *client;
struct mutex lock;
const struct ad5272_cfg *cfg;
- u8 buf[2] ____cacheline_aligned;
+ u8 buf[2] __aligned(IIO_DMA_MINALIGN);
};
static const struct iio_chan_spec ad5272_channel = {
