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 b5a0e498f7989791192f79e72e166eb5ed862a85..8806db95a91388c5962595fb6794a8d9f5345cd2 100644 (file)
--- a/drivers/cpuidle/governors/teo.c
+++ b/drivers/cpuidle/governors/teo.c
@@ -257,6 +257,13 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
                struct cpuidle_state_usage *su = &dev->states_usage[i];
 
                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