diff --git a/drivers/clk/qcom/vdd-class.c b/drivers/clk/qcom/vdd-class.c
index cca6ec118324..c3ecf1c2b639 100644
--- a/drivers/clk/qcom/vdd-class.c
+++ b/drivers/clk/qcom/vdd-class.c
@@ -8,6 +8,8 @@
 
 #include "vdd-class.h"
 
+static DEFINE_MUTEX(vdd_lock);
+
 /*
  * Aggregate the vdd_class level votes and call regulator framework functions
  * to enforce the highest vote.
@@ -86,12 +88,15 @@ int clk_vote_vdd_level(struct clk_vdd_class_data *vdd_data, int level)
 	if (level >= vdd_class->num_levels)
 		return -EINVAL;
 
+	mutex_lock(&vdd_lock);
 	vdd_class->level_votes[level]++;
 
 	ret = clk_aggregate_vdd(vdd_class);
 	if (ret)
 		vdd_class->level_votes[level]--;
 
+	mutex_unlock(&vdd_lock);
+
 	return ret;
 }
 EXPORT_SYMBOL(clk_vote_vdd_level);
@@ -121,12 +126,15 @@ int clk_unvote_vdd_level(struct clk_vdd_class_data *vdd_data, int level)
 		return -EINVAL;
 	}
 
+	mutex_lock(&vdd_lock);
 	vdd_class->level_votes[level]--;
 
 	ret = clk_aggregate_vdd(vdd_class);
 	if (ret)
 		vdd_class->level_votes[level]++;
 
+	mutex_unlock(&vdd_lock);
+
 	return ret;
 }
 EXPORT_SYMBOL(clk_unvote_vdd_level);