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ACPI: PM: s2idle: Prevent spurious SCIs from waking up the system

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If the platform triggers a spurious SCI even though the status bit
is not set for any GPE when the system is suspended to idle, it will
be treated as a genuine wakeup, so avoid that by checking if any GPEs
are active at all before returning 'true' from acpi_s2idle_wake().

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206413
Fixes: 56b9918490 ("PM: sleep: Simplify suspend-to-idle control flow")
Reported-by: Tsuchiya Yuto <kitakar@gmail.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 2020-02-11 17:53:52 +01:00
parent ea128834dd
commit fdde0ff859
1 changed files with 9 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/acpi/sleep.c
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@ -1006,10 +1006,16 @@ static bool acpi_s2idle_wake(void)
return true;
/*
* If there are no EC events to process, the wakeup is regarded
* as a genuine one.
* If there are no EC events to process and at least one of the
* other enabled GPEs is active, the wakeup is regarded as a
* genuine one.
*
* Note that the checks below must be carried out in this order
* to avoid returning prematurely due to a change of the EC GPE
* status bit from unset to set between the checks with the
* status bits of all the other GPEs unset.
*/
if (!acpi_ec_dispatch_gpe())
if (acpi_any_gpe_status_set() && !acpi_ec_dispatch_gpe())
return true;
/*