1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 2297ec193eb4..cb9e1146b02f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -589,7 +589,9 @@ static void domain_update_iommu_coherency(struct dmar_domain *domain)
 {
         int i;
 
-        domain->iommu_coherency = 1;
+        i = find_first_bit(domain->iommu_bmp, g_num_of_iommus);
+
+        domain->iommu_coherency = i < g_num_of_iommus ? 1 : 0;
 
         for_each_set_bit(i, domain->iommu_bmp, g_num_of_iommus) {
                 if (!ecap_coherent(g_iommus[i]->ecap)) {