diff --git a/nova/pci/device.py b/nova/pci/device.py
index 176e08a11a40..a7cb201cfdb3 100644
--- a/nova/pci/device.py
+++ b/nova/pci/device.py
@@ -95,29 +95,3 @@ def free(devobj, instance=None):
             instance['pci_devices'].remove(existed)
         else:
             instance.pci_devices.objects.remove(existed)
-
-
-def update_device(devobj, dev_dict):
-    """Sync the content from device dictionary to device object.
-
-    The resource tracker updates the available devices periodically.
-    To avoid meaningless syncs with the database, we update the device
-    object only if a value changed.
-    """
-
-    # Note(yjiang5): status/instance_uuid should only be updated by
-    # functions like claim/allocate etc. The id is allocated by
-    # database. The extra_info is created by the object.
-    no_changes = ('status', 'instance_uuid', 'id', 'extra_info')
-    map(lambda x: dev_dict.pop(x, None),
-        [key for key in no_changes])
-
-    for k, v in dev_dict.items():
-        if k in devobj.fields.keys():
-            devobj[k] = v
-        else:
-            # Note (yjiang5) extra_info.update does not update
-            # obj_what_changed, set it explicitely
-            extra_info = devobj.extra_info
-            extra_info.update({k: v})
-            devobj.extra_info = extra_info
diff --git a/nova/pci/manager.py b/nova/pci/manager.py
index 1711d1d66da5..f1216901eb45 100644
--- a/nova/pci/manager.py
+++ b/nova/pci/manager.py
@@ -143,7 +143,7 @@ class PciDevTracker(object):
                     # by force in future.
                     self.stale[new_value['address']] = new_value
                 else:
-                    device.update_device(existed, new_value)
+                    existed.update_device(new_value)
 
         for dev in [dev for dev in devices if
                     dev['address'] in new_addrs - exist_addrs]:
@@ -185,7 +185,7 @@ class PciDevTracker(object):
         device.free(dev, instance)
         stale = self.stale.pop(dev['address'], None)
         if stale:
-            device.update_device(dev, stale)
+            dev.update_device(stale)
         self.stats.add_device(dev)
 
     def _free_instance(self, instance):