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When the devtmpfs fails to mount, a dangling pointer still remains in global. Specifically, the err variable is passed by a pointer to the devtmpfsd. When the devtmpfsd exits, it sets the error and completes the setup_done. In this situation, the thread pointer is not set to null. After the devtmpfsd exited, the devtmpfs can wakes up the destroyed devtmpfsd thread by wake_up_process if a device change event comes. Signed-off-by: Yangxi Xiang <xyangxi5@gmail.com> Link: https://lore.kernel.org/r/20220627120409.11174-1-xyangxi5@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.