[PATCH] (5/13) aarp purge table on module unload

[Stephen Hemminger <shemminger@xxxxxxxx>]

Aarp does not clean the arp table when the appletalk module
is unloaded, and therefore can leak memory.

diff -Nru a/net/appletalk/aarp.c b/net/appletalk/aarp.c
--- a/net/appletalk/aarp.c      Fri Aug 29 13:31:00 2003
+++ b/net/appletalk/aarp.c      Fri Aug 29 13:31:00 2003
@@ -339,6 +339,32 @@
        return NOTIFY_DONE;
 }
 
+/* Expire all entries in a hash chain */
+static void __aarp_expire_all(struct aarp_entry **n)
+{
+       struct aarp_entry *t;
+
+       while (*n) {
+               t = *n;
+               *n = (*n)->next;
+               __aarp_expire(t);
+       }
+}
+
+/* Cleanup all hash chains -- module unloading */
+static void aarp_purge(void)
+{
+       int ct;
+
+       write_lock_bh(&aarp_lock);
+       for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
+               __aarp_expire_all(&resolved[ct]);
+               __aarp_expire_all(&unresolved[ct]);
+               __aarp_expire_all(&proxies[ct]);
+       }
+       write_unlock_bh(&aarp_lock);
+}
+
 /*
  *     Create a new aarp entry.  This must use GFP_ATOMIC because it
  *     runs while holding spinlocks.
@@ -958,6 +984,7 @@
        del_timer(&aarp_timer);
        unregister_netdevice_notifier(&aarp_notifier);
        unregister_snap_client(aarp_dl);
+       aarp_purge();
 }
 
 #ifdef CONFIG_PROC_FS