FROMLIST: 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.

Bug: 311580372
Link: https://lore.kernel.org/lkml/1700232572-25823-1-git-send-email-quic_mojha@quicinc.com


Change-Id: Iee739e29492056df9d664ef2294a7e0cdcc4458e
Fixes: 833c9545 ("device coredump: add new device coredump class")
Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
Cc: stable@vger.kernel.org
Signed-off-by: Naman Jain <quic_namajain@quicinc.com>