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Furquan Shaikh c8b1917c89 ACPICA: Clear status of GPEs before enabling them Commit `18996f2db9` ("ACPICA: Events: Stop unconditionally clearing ACPI IRQs during suspend/resume") was added to stop clearing event status bits unconditionally in the system-wide suspend and resume paths. This was done because of an issue with a laptop lid appaering to be closed even when it was used to wake up the system from suspend (see https://bugzilla.kernel.org/show_bug.cgi?id=196249), which happened because event status bits were cleared unconditionally on system resume. Though this change fixed the issue in the resume path, it introduced regressions in a few suspend paths. First regression was reported and fixed in the S5 entry path by commit `fa85015c0d` ("ACPICA: Clear status of all events when entering S5"). Next regression was reported and fixed for all legacy sleep paths by commit `f317c7dc12` ("ACPICA: Clear status of all events when entering sleep states"). However, there still is a suspend-to-idle regression, since suspend-to-idle does not follow the legacy sleep paths. In the suspend-to-idle case, wakeup is enabled as part of device suspend. If the status bits of wakeup GPEs are set when they are enabled, it causes a premature system wakeup to occur. To address that problem, partially revert commit `18996f2db9` to restore GPE status bits clearing before the GPE is enabled in acpi_ev_enable_gpe(). Fixes: `18996f2db9` ("ACPICA: Events: Stop unconditionally clearing ACPI IRQs during suspend/resume") Signed-off-by: Furquan Shaikh <furquan@google.com> Cc: 4.17+ <stable@vger.kernel.org> # 4.17+ [ rjw: Subject & changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2019-03-28 10:27:02 +01:00
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README

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.