This is a note to let you know that I've just added the patch titled
iio: imu: adis: ensure proper DMA alignment
to the 6.6-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-imu-adis-ensure-proper-dma-alignment.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8e98b87f515d8c4bae521048a037b2cc431c3fd5 Mon Sep 17 00:00:00 2001
From: Nuno Sa <nuno.sa@xxxxxxxxxx>
Date: Wed, 17 Jan 2024 14:10:49 +0100
Subject: iio: imu: adis: ensure proper DMA alignment
From: Nuno Sa <nuno.sa@xxxxxxxxxx>
commit 8e98b87f515d8c4bae521048a037b2cc431c3fd5 upstream.
Aligning the buffer to the L1 cache is not sufficient in some platforms
as they might have larger cacheline sizes for caches after L1 and thus,
we can't guarantee DMA safety.
That was the whole reason to introduce IIO_DMA_MINALIGN in [1]. Do the same
for the sigma_delta ADCs.
[1]: https://lore.kernel.org/linux-iio/20220508175712.647246-2-jic23@xxxxxxxxxx/
Fixes: ccd2b52f4ac6 ("staging:iio: Add common ADIS library")
Signed-off-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240117-adis-improv-v1-1-7f90e9fad200@xxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/iio/imu/adis.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -11,6 +11,7 @@
#include <linux/spi/spi.h>
#include <linux/interrupt.h>
+#include <linux/iio/iio.h>
#include <linux/iio/types.h>
#define ADIS_WRITE_REG(reg) ((0x80 | (reg)))
@@ -131,7 +132,7 @@ struct adis {
unsigned long irq_flag;
void *buffer;
- u8 tx[10] ____cacheline_aligned;
+ u8 tx[10] __aligned(IIO_DMA_MINALIGN);
u8 rx[4];
};
Patches currently in stable-queue which might be from nuno.sa@xxxxxxxxxx are
queue-6.6/iio-imu-adis-ensure-proper-dma-alignment.patch
queue-6.6/iio-adc-ad_sigma_delta-ensure-proper-dma-alignment.patch
queue-6.6/iio-adc-ad4130-zero-initialize-clock-init-data.patch
queue-6.6/iio-commom-st_sensors-ensure-proper-dma-alignment.patch
queue-6.6/iio-adc-ad4130-only-set-gpio_ctrl-if-pin-is-unused.patch
