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ACPI: EC: PM: Avoid premature returns from acpi_s2idle_wake() 

If the EC GPE status is not set after checking all of the other GPEs,
acpi_s2idle_wake() returns 'false', to indicate that the SCI event
that has just triggered is not a system wakeup one, but it does that
without canceling the pending wakeup and re-arming the SCI for system
wakeup which is a mistake, because it may cause s2idle_loop() to busy
spin until the next valid wakeup event.  [If that happens, the first
spurious wakeup is still pending after acpi_s2idle_wake() has
returned, so s2idle_enter() does nothing, acpi_s2idle_wake()
is called again and it sees that the SCI has triggered, but no GPEs
are active, so 'false' is returned again, and so on.]

Fix that by moving all of the GPE checking logic from
acpi_s2idle_wake() to acpi_ec_dispatch_gpe() and making the
latter return 'true' only if a non-EC GPE has triggered and
'false' otherwise, which will cause acpi_s2idle_wake() to
cancel the pending SCI wakeup and re-arm the SCI for system
wakeup regardless of the EC GPE status.

This also addresses a lockup observed on an Elitegroup EF20EA laptop
after attempting to wake it up from suspend-to-idle by a key press.

Fixes: d5406284ff ("ACPI: PM: s2idle: Refine active GPEs check")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=207603
Reported-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Fixes: fdde0ff859 ("ACPI: PM: s2idle: Prevent spurious SCIs from waking up the system")
Link: https://lore.kernel.org/linux-acpi/CAB4CAwdqo7=MvyG_PE+PGVfeA17AHF5i5JucgaKqqMX6mjArbQ@mail.gmail.com/
Reported-by: Chris Chiu <chiu@endlessm.com>
Tested-by: Chris Chiu <chiu@endlessm.com>
Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2020-05-09 10:44:41 +02:00
parent 0e698dfa28
commit 7b301750f7
3 changed files with 18 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/acpi/ec.c
View File

@ -1994,23 +1994,31 @@ void acpi_ec_set_gpe_wake_mask(u8 action)
acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action);
}
bool acpi_ec_other_gpes_active(void)
{
return acpi_any_gpe_status_set(first_ec ? first_ec->gpe : U32_MAX);
}
bool acpi_ec_dispatch_gpe(void)
{
u32 ret;
if (!first_ec)
return acpi_any_gpe_status_set(U32_MAX);
/*
* Report wakeup if the status bit is set for any enabled GPE other
* than the EC one.
*/
if (acpi_any_gpe_status_set(first_ec->gpe))
return true;
if (ec_no_wakeup)
return false;
/*
* Dispatch the EC GPE in-band, but do not report wakeup in any case
* to allow the caller to process events properly after that.
*/
ret = acpi_dispatch_gpe(NULL, first_ec->gpe);
if (ret == ACPI_INTERRUPT_HANDLED) {
if (ret == ACPI_INTERRUPT_HANDLED)
pm_pr_dbg("EC GPE dispatched\n");
return true;
}
return false;
}
#endif /* CONFIG_PM_SLEEP */

1
drivers/acpi/internal.h
View File

@ -202,7 +202,6 @@ void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
#ifdef CONFIG_PM_SLEEP
void acpi_ec_flush_work(void);
bool acpi_ec_other_gpes_active(void);
bool acpi_ec_dispatch_gpe(void);
#endif

14
drivers/acpi/sleep.c
View File

@ -1013,20 +1013,10 @@ static bool acpi_s2idle_wake(void)
if (acpi_check_wakeup_handlers())
return true;
/*
* If the status bit is set for any enabled GPE other than the
* EC one, the wakeup is regarded as a genuine one.
*/
if (acpi_ec_other_gpes_active())
/* Check non-EC GPE wakeups and dispatch the EC GPE. */
if (acpi_ec_dispatch_gpe())
return true;
/*
* If the EC GPE status bit has not been set, the wakeup is
* regarded as a spurious one.
*/
if (!acpi_ec_dispatch_gpe())
return false;
/*
* Cancel the wakeup and process all pending events in case
* there are any wakeup ones in there.