cpuidle: teo: Ignore disabled idle states that are too deep

Prevent disabled CPU idle state with target residencies beyond the
anticipated idle duration from being taken into account by the TEO
governor.

Fixes: b26bf6ab716f ("cpuidle: New timer events oriented governor for tickless systems")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+

diff --git a/drivers/cpuidle/governors/teo.c b/drivers/cpuidle/governors/teo.c
index b5a0e49..8806db9 100644 (file)
--- a/drivers/cpuidle/governors/teo.c
+++ b/drivers/cpuidle/governors/teo.c
@@ -258,6 +258,13 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
 
                if (s->disabled || su->disable) {
                        /*
+                        * Ignore disabled states with target residencies beyond
+                        * the anticipated idle duration.
+                        */
+                       if (s->target_residency > duration_us)
+                               continue;
+
+                       /*
                         * If the "early hits" metric of a disabled state is
                         * greater than the current maximum, it should be taken
                         * into account, because it would be a mistake to select