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SubjectRe: [PATCH] ACPICA: Clear status of all events when entering sleep states
Date
On Monday, August 13, 2018 7:15:19 PM CEST Schmauss, Erik wrote:
>
> > -----Original Message-----
> > From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-
> > owner@vger.kernel.org] On Behalf Of Rafael J. Wysocki
> > Sent: Sunday, August 12, 2018 3:50 AM
> > To: Linux ACPI <linux-acpi@vger.kernel.org>
> > Cc: Paul Menzel <pmenzel@molgen.mpg.de>; Linux PM <linux-
> > pm@vger.kernel.org>; LKML <linux-kernel@vger.kernel.org>; Schmauss, Erik
> > <erik.schmauss@intel.com>
> > Subject: [PATCH] ACPICA: Clear status of all events when entering sleep states
> >
> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >
> > 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 | 11 +++--------
> > 1 file changed, 3 insertions(+), 8 deletions(-)
> >
> > Index: linux-pm/drivers/acpi/acpica/hwsleep.c
> > =================================================================
> > ==
> > --- linux-pm.orig/drivers/acpi/acpica/hwsleep.c
> > +++ linux-pm/drivers/acpi/acpica/hwsleep.c
> > @@ -56,14 +56,9 @@ acpi_status acpi_hw_legacy_sleep(u8 slee
> > if (ACPI_FAILURE(status)) {
> > return_ACPI_STATUS(status);
> > }
> > - /*
> > - * If the target sleep state is S5, clear all GPEs and fixed events too
> > - */
> > - if (sleep_state == ACPI_STATE_S5) {
> > - status = acpi_hw_clear_acpi_status();
> > - if (ACPI_FAILURE(status)) {
> > - return_ACPI_STATUS(status);
> > - }
> > + status = acpi_hw_clear_acpi_status();
> > + if (ACPI_FAILURE(status)) {
> > + return_ACPI_STATUS(status);
> > }
> > acpi_gbl_system_awake_and_running = FALSE;
> >
>
> I'll backport this for the next ACPICA release

Thanks!

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