ACPICA: Clear status of all events when entering sleep states
authorRafael J. Wysocki <rafael.j.wysocki@intel.com>
Sun, 12 Aug 2018 10:50:09 +0000 (12:50 +0200)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tue, 14 Aug 2018 21:52:28 +0000 (23:52 +0200)
commitf317c7dc12b73eb9d67fdae404563deb907dcfb7
tree4bb14cef54ef42668c5a28fe0b5b57f9f382471e
parent4efa829d195172d630dcd1b2f9b239bcce69639e
ACPICA: Clear status of all events when entering sleep states

Commit fa85015c0d95 (ACPICA: Clear status of all events when entering
S5) made the sleep state entry code in ACPICA clear the status of all
ACPI events when entering S5 to fix a functional regression reported
against commit 18996f2db918 (ACPICA: Events: Stop unconditionally
clearing ACPI IRQs during suspend/resume).  However, it is reported
now that the regression also affects system states other than S5 on
some systems and causes them to wake up from sleep prematurely.

For this reason, make the code in question clear the status of all
ACPI events when entering all sleep states (in addition to S5) to
avoid the premature wakeups (this may cause some wakeup events to
be missed in theory, but the likelihood of that is small and the
change here simply restores the previous behavior of the code).

Fixes: 18996f2db918 (ACPICA: Events: Stop unconditionally clearing ACPI IRQs during suspend/resume)
Reported-by: Paul Menzel <pmenzel@molgen.mpg.de>
Tested-by: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: 4.17+ <stable@vger.kernel.org> # 4.17+: fa85015c0d95 ACPICA: Clear status ...
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/acpi/acpica/hwsleep.c