The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x af54d778a03853801d681c98c0c2a6c316ef9ca7 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023121143-cheddar-struck-1e31@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
af54d778a038 ("devcoredump: Send uevent once devcd is ready") 01daccf74832 ("devcoredump : Serialize devcd_del work")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From af54d778a03853801d681c98c0c2a6c316ef9ca7 Mon Sep 17 00:00:00 2001 From: Mukesh Ojha quic_mojha@quicinc.com Date: Fri, 17 Nov 2023 20:19:32 +0530 Subject: [PATCH] devcoredump: Send uevent once devcd is ready
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@quicinc.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/1700232572-25823-1-git-send-email-quic_mojha@quici... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
diff --git a/drivers/base/devcoredump.c b/drivers/base/devcoredump.c index 91536ee05f14..7e2d1f0d903a 100644 --- a/drivers/base/devcoredump.c +++ b/drivers/base/devcoredump.c @@ -362,6 +362,7 @@ void dev_coredumpm(struct device *dev, struct module *owner, 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, struct module *owner, "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);