This is a note to let you know that I've just added the patch titled
devcoredump: Send uevent once devcd is ready
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:
devcoredump-send-uevent-once-devcd-is-ready.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 af54d778a03853801d681c98c0c2a6c316ef9ca7 Mon Sep 17 00:00:00 2001
From: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
Date: Fri, 17 Nov 2023 20:19:32 +0530
Subject: devcoredump: Send uevent once devcd is ready
From: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
commit af54d778a03853801d681c98c0c2a6c316ef9ca7 upstream.
dev_coredumpm() creates a devcoredump device and adds it
to the core kernel framework which eventually end up
sending uevent to the user space and later creates a
symbolic link to the failed device. An application
running in userspace may be interested in this symbolic
link to get the name of the failed device.
In a issue scenario, once uevent sent to the user space
it start reading '/sys/class/devcoredump/devcdX/failing_device'
to get the actual name of the device which might not been
created and it is in its path of creation.
To fix this, suppress sending uevent till the failing device
symbolic link gets created and send uevent once symbolic
link is created successfully.
Fixes: 833c95456a70 ("device coredump: add new device coredump class")
Signed-off-by: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/1700232572-25823-1-git-send-email-quic_mojha@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/devcoredump.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/base/devcoredump.c
+++ b/drivers/base/devcoredump.c
@@ -362,6 +362,7 @@ void dev_coredumpm(struct device *dev, s
devcd->devcd_dev.class = &devcd_class;
mutex_lock(&devcd->mutex);
+ dev_set_uevent_suppress(&devcd->devcd_dev, true);
if (device_add(&devcd->devcd_dev))
goto put_device;
@@ -376,6 +377,8 @@ void dev_coredumpm(struct device *dev, s
"devcoredump"))
dev_warn(dev, "devcoredump create_link failed\n");
+ dev_set_uevent_suppress(&devcd->devcd_dev, false);
+ kobject_uevent(&devcd->devcd_dev.kobj, KOBJ_ADD);
INIT_DELAYED_WORK(&devcd->del_wk, devcd_del);
schedule_delayed_work(&devcd->del_wk, DEVCD_TIMEOUT);
mutex_unlock(&devcd->mutex);
Patches currently in stable-queue which might be from quic_mojha@xxxxxxxxxxx are
queue-6.6/devcoredump-send-uevent-once-devcd-is-ready.patch
