diff --git a/arch/arm/plat-rk/dvfs.c b/arch/arm/plat-rk/dvfs.c
index 1b991997c151..4f82c153d4c3 100755
--- a/arch/arm/plat-rk/dvfs.c
+++ b/arch/arm/plat-rk/dvfs.c
@@ -106,7 +106,7 @@ static void dvfs_get_vd_regulator_volt_list(struct vd_node *vd)
 	if(selector>VD_VOL_LIST_CNT)
 		selector=VD_VOL_LIST_CNT;
 	
-	mutex_unlock(&mutex);
+	mutex_lock(&mutex);
 	for (i = 0; i<selector; i++) {
 		sel_volt=dvfs_regulator_list_voltage(vd->regulator,i);
 		if(sel_volt<=0)