This is a note to let you know that I've just added the patch titled
iio: dac: ad5770r: 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-dac-ad5770r-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 efb98c037ba42d660fc4c3ddb6fb082fa0b539ce
Author: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Date: Sun May 8 18:56:34 2022 +0100
iio: dac: ad5770r: Fix alignment for DMA safety
[ Upstream commit 27f2261d16d01858b8e5baca5a1a515b040429c4 ]
____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: cbbb819837f6 ("iio: dac: ad5770r: Add AD5770R support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220508175712.647246-55-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/dac/ad5770r.c b/drivers/iio/dac/ad5770r.c
index 7e2fd32e993a..f66d67402e43 100644
--- a/drivers/iio/dac/ad5770r.c
+++ b/drivers/iio/dac/ad5770r.c
@@ -140,7 +140,7 @@ struct ad5770r_state {
bool ch_pwr_down[AD5770R_MAX_CHANNELS];
bool internal_ref;
bool external_res;
- u8 transf_buf[2] ____cacheline_aligned;
+ u8 transf_buf[2] __aligned(IIO_DMA_MINALIGN);
};
static const struct regmap_config ad5770r_spi_regmap_config = {
