[PATCH v3 4/4] iommu/vt-d: Remove redundant IOTLB flush

[Lu Baolu]

IOTLB flush already included in the PASID tear down and the page request
drain process. There is no need to flush again.

Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 drivers/iommu/intel-svm.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 2534641ef707..543109fe2003 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -212,7 +212,6 @@ static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 	list_for_each_entry_rcu(sdev, &svm->devs, list) {
 		intel_pasid_tear_down_entry(svm->iommu, sdev->dev, svm->pasid);
 		intel_svm_drain_prq(sdev->dev, svm->pasid);
-		intel_flush_svm_range_dev(svm, sdev, 0, -1, 0);
 	}
 	rcu_read_unlock();
 
@@ -406,7 +405,6 @@ int intel_svm_unbind_gpasid(struct device *dev, int pasid)
 			list_del_rcu(&sdev->list);
 			intel_pasid_tear_down_entry(iommu, dev, svm->pasid);
 			intel_svm_drain_prq(dev, svm->pasid);
-			intel_flush_svm_range_dev(svm, sdev, 0, -1, 0);
 			kfree_rcu(sdev, rcu);
 
 			if (list_empty(&svm->devs)) {
@@ -645,7 +643,6 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
 			 * hard to be as defensive as we might like. */
 			intel_pasid_tear_down_entry(iommu, dev, svm->pasid);
 			intel_svm_drain_prq(dev, svm->pasid);
-			intel_flush_svm_range_dev(svm, sdev, 0, -1, 0);
 			kfree_rcu(sdev, rcu);
 
 			if (list_empty(&svm->devs)) {
-- 
2.17.1