[src/trunk]: src/sys/modules/lua Only load a module if it is not already load...

[mbalmer <mbalmer%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2e7eebf20ace
branches:  trunk
changeset: 353748:2e7eebf20ace
user:      mbalmer <mbalmer%NetBSD.org@localhost>
date:      Sat May 20 08:31:13 2017 +0000

description:
Only load a module if it is not already loaded in a state (much like userland
Lua handles require).
Fixes PR kern/52226.

diffstat:

 sys/modules/lua/lua.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (25 lines):

diff -r af2bed4c865a -r 2e7eebf20ace sys/modules/lua/lua.c
--- a/sys/modules/lua/lua.c     Sat May 20 08:00:47 2017 +0000
+++ b/sys/modules/lua/lua.c     Sat May 20 08:31:13 2017 +0000
@@ -1,8 +1,8 @@
-/*     $NetBSD: lua.c,v 1.21 2017/05/11 07:34:27 mbalmer Exp $ */
+/*     $NetBSD: lua.c,v 1.22 2017/05/20 08:31:13 mbalmer Exp $ */
 
 /*
+ * Copyright (c) 2011 - 2017 by Marc Balmer <mbalmer%NetBSD.org@localhost>.
  * Copyright (c) 2014 by Lourival Vieira Neto <lneto%NetBSD.org@localhost>.
- * Copyright (c) 2011 - 2014 by Marc Balmer <mbalmer%NetBSD.org@localhost>.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -514,6 +514,10 @@
        if (md != NULL)
                LIST_FOREACH(s, &lua_states, lua_next)
                        if (s->K->L == L) {
+                               LIST_FOREACH(m, &s->lua_modules, mod_next)
+                                       if (m == md)
+                                               return 1;
+
                                if (lua_verbose)
                                        device_printf(sc_self,
                                            "require module %s\n",