This is a note to let you know that I've just added the patch titled
iio: dac: ad5791: Fix alignment for DMA saftey
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-dac-ad5791-fix-alignment-for-dma-saftey.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 d668360b289fcc8815be00adeb2b94b918a35b0f
Author: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Date: Sun May 8 18:56:35 2022 +0100
iio: dac: ad5791: Fix alignment for DMA saftey
[ Upstream commit b2d5e9de77c8774a5a6cff59d928f2fa38cbc642 ]
____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: 791bb52a0cd2 ("iio:ad5791: Do not store transfer buffers on the stack")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220508175712.647246-56-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/dac/ad5791.c b/drivers/iio/dac/ad5791.c
index 2b14914b4050..ee7e89774d9d 100644
--- a/drivers/iio/dac/ad5791.c
+++ b/drivers/iio/dac/ad5791.c
@@ -95,7 +95,7 @@ struct ad5791_state {
union {
__be32 d32;
u8 d8[4];
- } data[3] ____cacheline_aligned;
+ } data[3] __aligned(IIO_DMA_MINALIGN);
};
enum ad5791_supported_device_ids {
