This is a note to let you know that I've just added the patch titled
iio: adc: ad7949: 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-adc-ad7949-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 afe579b0def3600f5a2f640fee9e6515bfb76e4a
Author: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Date: Sun May 8 18:55:59 2022 +0100
iio: adc: ad7949: Fix alignment for DMA safety
[ Upstream commit 9c6c7eff7d4a53efd4d0818f8664259a1862665a ]
____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.
Note the fixes tag predates some changes to this line of code so
automated application of this fix may fail.
Fixes: 7f40e0614317 ("iio:adc:ad7949: Add AD7949 ADC driver family")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Charles-Antoine Couret <charles-antoine.couret@xxxxxxxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220508175712.647246-20-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/adc/ad7949.c b/drivers/iio/adc/ad7949.c
index 44bb5fde83de..ed4c1656ca75 100644
--- a/drivers/iio/adc/ad7949.c
+++ b/drivers/iio/adc/ad7949.c
@@ -86,7 +86,7 @@ struct ad7949_adc_chip {
u8 resolution;
u16 cfg;
unsigned int current_channel;
- u16 buffer ____cacheline_aligned;
+ u16 buffer __aligned(IIO_DMA_MINALIGN);
__be16 buf8b;
};
