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rtw_cmd_thread() "up(s)" a semaphore twice, first to notify callers when its execution is started and then to notify when it is about to end. It makes the same semaphore go "up" twice in the same thread. This construct makes Smatch to warn of duplicate "up(s)". This thread uses interruptible semaphores where instead completions are more suitable. For this purpose it calls an helper (_rtw_down_sema()) that returns values that are never checked. It may lead to bugs. To address the above-mentioned issues, use two completions variables instead of semaphores. Use the uninterruptible versions of wake_for_completion*() because the interruptible / killable versions are not necessary. Tested with "ASUSTek Computer, Inc. Realtek 8188EUS [USB-N10 Nano]". Acked-by: Phillip Potter <phil@philpotter.co.uk> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Link: https://lore.kernel.org/r/20211018162006.5527-2-fmdefrancesco@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.