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The usage of fw_crash debugfs is to write 1 to it to trigger fw crash simulation and to read from it to check the state. When zero is read, it is supposed to mean fw crash/restart process is done. Then, some test plans can be designed for crash/restart. e.g. step 1. trigger fw crash simulation step 2. poll the state until zero is read step 3. check connection by ping test However, in certain connection cases, triggering fw crash simulation will take a while. If the state is queried too early before restart begins processing, it may mistakenly think restart process has been done. If some tests are started at this time, something unexpected might happen due to the follow-up restart process. To avoid that, let fw_crash also show non-zero when a simulation is still triggering. Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20211001082301.4805-1-pkshih@realtek.com
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.