diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 4ed3fd177f15..eac6d07e6097 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1654,7 +1654,7 @@ static void arm_smmu_secure_domain_unlock(struct arm_smmu_domain *smmu_domain)
 
 static unsigned long arm_smmu_pgtbl_lock(struct arm_smmu_domain *smmu_domain)
 {
-	unsigned long flags;
+	unsigned long flags = 0;
 
 	if (arm_smmu_is_slave_side_secure(smmu_domain))
 		mutex_lock(&smmu_domain->pgtbl_mutex_lock);