Index: uspace/lib/usb/src/host/usb_endpoint_manager.c
===================================================================
--- uspace/lib/usb/src/host/usb_endpoint_manager.c	(revision b77ce846fff6014d76b815421e18b3d5a97d502d)
+++ uspace/lib/usb/src/host/usb_endpoint_manager.c	(revision a39cfb83acdf892bd28d90ba735bda7f529d6f9d)
@@ -211,4 +211,7 @@
 
 	node_t *node = hash_table_get_instance(item, node_t, link);
+	if (node->ep->active)
+		return EBUSY;
+
 	instance->free_bw += node->bw;
 	hash_table_remove(&instance->ep_table, key, MAX_KEYS);