9590192f25
handle_button_press_event() currently determines whether the slot has been turned on or off by looking at the Power Controller Control bit in the Slot Control register. This assumes that an attention button implies presence of a power controller even though that's not mandated by the spec. Moreover the Power Controller Control bit is unreliable when a power fault occurs (PCIe r4.0, sec 6.7.1.8). This issue has existed since the driver was introduced in 2004. Fix by replacing STATIC_STATE with ON_STATE and OFF_STATE and tracking whether the slot has been turned on or off. This is also a required ingredient to make pciehp resilient to missed events, which is the object of an upcoming commit. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.