net: openvswitch: use hlist_for_each_entry_rcu instead of hlist_for_each_entry

The struct sw_flow is protected by RCU, when traversing them,
use hlist_for_each_entry_rcu.

Signed-off-by: Tonghao Zhang <[e-mail]>
Tested-by: Greg Rose <[e-mail]>
Reviewed-by: Greg Rose <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/openvswitch/flow_table.c

···
 		struct hlist_head *head = &old->buckets[i];
 
 		if (ufid)
-			hlist_for_each_entry(flow, head,
-					     ufid_table.node[old_ver])
+			hlist_for_each_entry_rcu(flow, head,
+						 ufid_table.node[old_ver],
+						 lockdep_ovsl_is_held())
 				ufid_table_instance_insert(new, flow);
 		else
-			hlist_for_each_entry(flow, head,
-					     flow_table.node[old_ver])
+			hlist_for_each_entry_rcu(flow, head,
+						 flow_table.node[old_ver],
+						 lockdep_ovsl_is_held())
 				table_instance_insert(new, flow);
 	}