Merge tag 'pm-5.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fix from Rafael Wysocki:
 "Prevent the suspend-to-idle internal loop from busy spinning after a
  spurious ACPI SCI wakeup in some cases"

* tag 'pm-5.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: EC: PM: Avoid premature returns from acpi_s2idle_wake()

3 files changed, 18 insertions, 21 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index b4c0152e92aa..145ec0b6f20b 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -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 */
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index e387517d3354..43411a7457cd 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -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
 
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 4edc8a3ce40f..3850704570c0 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -1013,21 +1013,11 @@ 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.
 		 *