diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 468427a25c9de48cc494b77193139d03cdfcc6d5..1f569c37a7dd5fb1c61aaf92a4c9e9459f1340b1 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8569,6 +8569,13 @@ static inline int alloc_qos_sched_group(struct task_group *tg,
 #ifdef CONFIG_QOS_SCHED_SMT_EXPELLER
 	tg->smt_expell = parent->smt_expell;
 #endif
+	tg->qos_level_mutex = kzalloc(sizeof(struct mutex), GFP_KERNEL);
+
+	if (!tg->qos_level_mutex)
+		return 0;
+
+	mutex_init(tg->qos_level_mutex);
+
 	return 1;
 }
 
@@ -9512,6 +9519,7 @@ static int tg_change_scheduler(struct task_group *tg, void *data)
 	s64 qos_level = *(s64 *)data;
 	struct cgroup_subsys_state *css = &tg->css;
 
+	mutex_lock(tg->qos_level_mutex);
 	tg->qos_level = qos_level;
 	if (is_offline_level(qos_level))
 		policy = SCHED_IDLE;
@@ -9529,6 +9537,7 @@ static int tg_change_scheduler(struct task_group *tg, void *data)
 		sched_setscheduler(tsk, policy, &param);
 	}
 	css_task_iter_end(&it);
+	mutex_unlock(tg->qos_level_mutex);
 
 	return 0;
 }
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 25f5fd2152228c720324d08fbf34e6bb5dfd5997..1797541d575b417e27807096a5fd02afedc71dff 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -12853,6 +12853,9 @@ void free_fair_sched_group(struct task_group *tg)
 			kfree(tg->se[i]);
 	}
 
+#ifdef CONFIG_QOS_SCHED
+	kfree(tg->qos_level_mutex);
+#endif
 	kfree(tg->cfs_rq);
 	kfree(tg->se);
 }
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 0f871e9b169c598996dbe3177e49aba6d07e1f25..738c0ea74b46a1b10db480b4d8b6c7462ad13cea 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -466,7 +466,11 @@ struct task_group {
 #else
 	KABI_RESERVE(2)
 #endif
+#ifdef CONFIG_QOS_SCHED
+	KABI_USE(3, struct mutex *qos_level_mutex)
+#else
 	KABI_RESERVE(3)
+#endif
 	KABI_RESERVE(4)
 };