Index: uspace/srv/devman/devman.h
===================================================================
--- uspace/srv/devman/devman.h	(revision 50ad3f329286f24e8408052e2f1d3f2c5542be70)
+++ uspace/srv/devman/devman.h	(revision efcfab9487db1266bdff01fe908eb872722f53b7)
@@ -174,4 +174,6 @@
 	/** State */
 	fun_state_t state;
+	/** Locked while performing reconfiguration operations */
+	fibril_mutex_t busy_lock;
 	
 	/** The global unique identifier of the function */
@@ -279,4 +281,5 @@
 extern void dev_add_ref(dev_node_t *);
 extern void dev_del_ref(dev_node_t *);
+
 extern dev_node_t *find_dev_node_no_lock(dev_tree_t *tree,
     devman_handle_t handle);
@@ -290,4 +293,6 @@
 extern void fun_add_ref(fun_node_t *);
 extern void fun_del_ref(fun_node_t *);
+extern void fun_busy_lock(fun_node_t *);
+extern void fun_busy_unlock(fun_node_t *);
 extern fun_node_t *find_fun_node_no_lock(dev_tree_t *tree,
     devman_handle_t handle);