1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 87274b54febd..f002d47d2f27 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1538,6 +1538,9 @@ static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu)
         u32 pmen;
         unsigned long flags;
 
+        if (!cap_plmr(iommu->cap) && !cap_phmr(iommu->cap))
+                return;
+
         raw_spin_lock_irqsave(&iommu->register_lock, flags);
         pmen = readl(iommu->reg + DMAR_PMEN_REG);
         pmen &= ~DMA_PMEN_EPM;