I have come up with this change when debugging netdevices not being
free()d on shutdown(). The dhcppkt->settings registered in
dhcp_request_rx() with netdev's settings as parent are not unregistered
anywhere. That makes the netdevice's refcnt to stay >=0.

Apart from that it also just seems to make sense to not leave parentless
children settings around.
---
 src/core/settings.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/src/core/settings.c b/src/core/settings.c
index 963bfd5..93ed2ea 100644
--- a/src/core/settings.c
+++ b/src/core/settings.c
@@ -459,15 +459,21 @@ int register_settings ( struct settings *settings, struct 
settings *parent ) {
  * @v settings         Settings block
  */
 void unregister_settings ( struct settings *settings ) {
+       struct settings *child;
+       struct settings *tmp;
+
+       list_for_each_entry_safe ( child, tmp, &settings->children, siblings ) {
+               unregister_settings ( child );
+       }
 
        DBGC ( settings, "Settings %p (\"%s\") unregistered\n",
               settings, settings_name ( settings ) );
 
        /* Remove from list of settings */
-       ref_put ( settings->refcnt );
        ref_put ( settings->parent->refcnt );
        settings->parent = NULL;
        list_del ( &settings->siblings );
+       ref_put ( settings->refcnt );
 
        /* Apply potentially-updated settings */
        apply_settings();
-- 
1.7.1

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