diff --git a/nova/pci/manager.py b/nova/pci/manager.py
index ff161e38cafb..3084643f5e8a 100644
--- a/nova/pci/manager.py
+++ b/nova/pci/manager.py
@@ -314,23 +314,43 @@ class PciDevTracker(object):
         for dev in freed_devs:
             self.stats.add_device(dev)
 
-    def _free_instance(self, instance):
+    def free_instance_allocations(self, context, instance):
+        """Free devices that are in ALLOCATED state for instance.
+
+        :param context: user request context (nova.context.RequestContext)
+        :param instance: instance object
+        """
+        if self.allocations.pop(instance['uuid'], None):
+            for dev in self.pci_devs:
+                if (dev.status == fields.PciDeviceStatus.ALLOCATED and
+                        dev.instance_uuid == instance['uuid']):
+                    self._free_device(dev)
+
+    def free_instance_claims(self, context, instance):
+        """Free devices that are in CLAIMED state for instance.
+
+        :param context: user request context (nova.context.RequestContext)
+        :param instance: instance object
+        """
+        if self.claims.pop(instance['uuid'], None):
+            for dev in self.pci_devs:
+                if (dev.status == fields.PciDeviceStatus.CLAIMED and
+                        dev.instance_uuid == instance['uuid']):
+                    self._free_device(dev)
+
+    def free_instance(self, context, instance):
+        """Free devices that are in CLAIMED or ALLOCATED state for instance.
+
+        :param context: user request context (nova.context.RequestContext)
+        :param instance: instance object
+        """
         # Note(yjiang5): When an instance is resized, the devices in the
         # destination node are claimed to the instance in prep_resize stage.
         # However, the instance contains only allocated devices
         # information, not the claimed one. So we can't use
         # instance['pci_devices'] to check the devices to be freed.
-        for dev in self.pci_devs:
-            if dev.status in (fields.PciDeviceStatus.CLAIMED,
-                              fields.PciDeviceStatus.ALLOCATED):
-                if dev.instance_uuid == instance['uuid']:
-                    self._free_device(dev)
-
-    def free_instance(self, context, instance):
-        if self.allocations.pop(instance['uuid'], None):
-            self._free_instance(instance)
-        elif self.claims.pop(instance['uuid'], None):
-            self._free_instance(instance)
+        self.free_instance_allocations(context, instance)
+        self.free_instance_claims(context, instance)
 
     def update_pci_for_instance(self, context, instance, sign):
         """Update PCI usage information if devices are de/allocated.
diff --git a/nova/tests/unit/pci/test_manager.py b/nova/tests/unit/pci/test_manager.py
index 2ea986dc197e..fe7d918e27b9 100644
--- a/nova/tests/unit/pci/test_manager.py
+++ b/nova/tests/unit/pci/test_manager.py
@@ -546,6 +546,58 @@ class PciDevTrackerTestCase(test.NoDBTestCase):
         self.assertIn(pci_device.id, free_pci_device_ids)
         self.assertIsNone(self.tracker.allocations.get(instance_uuid))
 
+    def test_free_instance_claims(self):
+        # Create an InstancePCIRequest object
+        pci_requests_obj = self._create_pci_requests_object(
+            [{'count': 1, 'spec': [{'vendor_id': 'v'}]}])
+
+        # Claim a single PCI device
+        claimed_devs = self.tracker.claim_instance(mock.sentinel.context,
+                                                   pci_requests_obj, None)
+
+        # Assert we have exactly one claimed device for the given instance.
+        claimed_dev = claimed_devs[0]
+        instance_uuid = self.inst['uuid']
+        self.assertEqual(1, len(self.tracker.claims.get(instance_uuid)))
+        self.assertIn(claimed_dev.id,
+                      [pci_dev.id for pci_dev in
+                       self.tracker.claims.get(instance_uuid)])
+        self.assertIsNone(self.tracker.allocations.get(instance_uuid))
+
+        # Free instance claims
+        self.tracker.free_instance_claims(mock.sentinel.context, self.inst)
+
+        # Assert no claims for instance and all PCI devices are free
+        self.assertIsNone(self.tracker.claims.get(instance_uuid))
+        free_devs = self.tracker.pci_stats.get_free_devs()
+        self.assertEqual(len(fake_db_devs), len(free_devs))
+
+    def test_free_instance_allocations(self):
+        # Create an InstancePCIRequest object
+        pci_requests_obj = self._create_pci_requests_object(
+            [{'count': 1, 'spec': [{'vendor_id': 'v'}]}])
+        # Allocate a single PCI device
+        allocated_devs = self.tracker.claim_instance(mock.sentinel.context,
+                                                     pci_requests_obj, None)
+        self.tracker.allocate_instance(self.inst)
+
+        # Assert we have exactly one allocated device for the given instance.
+        allocated_dev = allocated_devs[0]
+        instance_uuid = self.inst['uuid']
+        self.assertIsNone(self.tracker.claims.get(instance_uuid))
+        self.assertEqual(1, len(self.tracker.allocations.get(instance_uuid)))
+        self.assertIn(allocated_dev.id,
+                      [pci_dev.id for pci_dev in
+                       self.tracker.allocations.get(instance_uuid)])
+
+        # Free instance allocations and assert claims did not change
+        self.tracker.free_instance_allocations(mock.sentinel.context,
+                                               self.inst)
+        # Assert all PCI devices are free.
+        self.assertIsNone(self.tracker.allocations.get(instance_uuid))
+        free_devs = self.tracker.pci_stats.get_free_devs()
+        self.assertEqual(len(fake_db_devs), len(free_devs))
+
 
 class PciGetInstanceDevs(test.NoDBTestCase):