From 10ba3de332116a3584e4b4df75bc5abe36bafb46 Mon Sep 17 00:00:00 2001 From: tilghman Date: Fri, 19 Feb 2010 19:05:34 +0000 Subject: Merged revisions 228798 via svnmerge from https://origsvn.digium.com/svn/asterisk/trunk (closes issue #16470) Reported by: kjotte ........ r228798 | tilghman | 2009-11-09 01:37:52 -0600 (Mon, 09 Nov 2009) | 14 lines Fix various problems detected with Valgrind. * chan_console accessed pvts after deallocation. * The module loader did not check usecount on shutdown, which led to chan_iax2 reading a timer that was already unloaded. (closes issue #16062) Reported by: alexanderheinz Patches: 20091109__issue16062.diff.txt uploaded by tilghman (license 14) Tested by: tilghman ........ git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.1@248009 f38db490-d61c-443f-a65b-d21fe96a405b --- main/loader.c | 47 ++++++++++++++++++++++++++++++----------------- 1 file changed, 30 insertions(+), 17 deletions(-) (limited to 'main') diff --git a/main/loader.c b/main/loader.c index fb57189b5..268cc80c8 100644 --- a/main/loader.c +++ b/main/loader.c @@ -443,26 +443,39 @@ static struct ast_module *load_dynamic_module(const char *resource_in, unsigned void ast_module_shutdown(void) { struct ast_module *mod; - AST_LIST_HEAD_NOLOCK_STATIC(local_module_list, ast_module); - - /* We have to call the unload() callbacks in reverse order that the modules - * exist in the module list so it is the reverse order of how they were - * loaded. */ + int somethingchanged = 1, final = 0; AST_LIST_LOCK(&module_list); - while ((mod = AST_LIST_REMOVE_HEAD(&module_list, entry))) - AST_LIST_INSERT_HEAD(&local_module_list, mod, entry); - AST_LIST_UNLOCK(&module_list); - while ((mod = AST_LIST_REMOVE_HEAD(&local_module_list, entry))) { - if (mod->info->unload) - mod->info->unload(); - /* Since this should only be called when shutting down "gracefully", - * all channels should be down before we get to this point, meaning - * there will be no module users left. */ - AST_LIST_HEAD_DESTROY(&mod->users); - free(mod); - } + /*!\note Some resources, like timers, are started up dynamically, and thus + * may be still in use, even if all channels are dead. We must therefore + * check the usecount before asking modules to unload. */ + do { + if (!somethingchanged) { + /*!\note If we go through the entire list without changing + * anything, ignore the usecounts and unload, then exit. */ + final = 1; + } + + /* Reset flag before traversing the list */ + somethingchanged = 0; + + AST_LIST_TRAVERSE_SAFE_BEGIN(&module_list, mod, entry) { + if (!final && mod->usecount) { + continue; + } + AST_LIST_REMOVE_CURRENT(entry); + if (mod->info->unload) { + mod->info->unload(); + } + AST_LIST_HEAD_DESTROY(&mod->users); + free(mod); + somethingchanged = 1; + } + AST_LIST_TRAVERSE_SAFE_END; + } while (somethingchanged && !final); + + AST_LIST_UNLOCK(&module_list); } int ast_unload_resource(const char *resource_name, enum ast_module_unload_mode force) -- cgit v1.2.3