Don't start/stop autoservice in pbx_extension_helper() unless a channel exists

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@89839 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -1792,26 +1792,30 @@ static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
 
 	int matching_action = (action == E_MATCH || action == E_CANMATCH || action == E_MATCHMORE);
 
-	ast_autoservice_start(c);
+	if (c)
+		ast_autoservice_start(c);
 
 	ast_mutex_lock(&conlock);
 	e = pbx_find_extension(c, con, &q, context, exten, priority, label, callerid, action);
 	if (e) {
 		if (matching_action) {
 			ast_mutex_unlock(&conlock);
-			ast_autoservice_stop(c);
+			if (c)
+				ast_autoservice_stop(c);
 			return -1;	/* success, we found it */
 		} else if (action == E_FINDLABEL) { /* map the label to a priority */
 			res = e->priority;
 			ast_mutex_unlock(&conlock);
-			ast_autoservice_stop(c);
+			if (c)
+				ast_autoservice_stop(c);
 			return res;	/* the priority we were looking for */
 		} else {	/* spawn */
 			app = pbx_findapp(e->app);
 			ast_mutex_unlock(&conlock);
 			if (!app) {
 				ast_log(LOG_WARNING, "No application '%s' for extension (%s, %s, %d)\n", e->app, context, exten, priority);
-				ast_autoservice_stop(c);
+				if (c)
+					ast_autoservice_stop(c);
 				return -1;
 			}
 			if (c->context != context)
@@ -1847,20 +1851,23 @@ static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
 					"AppData: %s\r\n"
 					"Uniqueid: %s\r\n",
 					c->name, c->context, c->exten, c->priority, app->name, passdata, c->uniqueid);
-			ast_autoservice_stop(c);
+			if (c)
+				ast_autoservice_stop(c);
 			return pbx_exec(c, app, passdata);	/* 0 on success, -1 on failure */
 		}
 	} else if (q.swo) {	/* not found here, but in another switch */
 		ast_mutex_unlock(&conlock);
 		if (matching_action) {
-			ast_autoservice_stop(c);
+			if (c)
+				ast_autoservice_stop(c);
 			return -1;
 		} else {
 			if (!q.swo->exec) {
 				ast_log(LOG_WARNING, "No execution engine for switch %s\n", q.swo->name);
 				res = -1;
 			}
-			ast_autoservice_stop(c);
+			if (c)
+				ast_autoservice_stop(c);
 			return q.swo->exec(c, q.foundcontext ? q.foundcontext : context, exten, priority, callerid, q.data);
 		}
 	} else {	/* not found anywhere, see what happened */
@@ -1887,7 +1894,8 @@ static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
 				ast_log(LOG_DEBUG, "Shouldn't happen!\n");
 		}
 
-		ast_autoservice_stop(c);
+		if (c)
+			ast_autoservice_stop(c);
 
 		return (matching_action) ? 0 : -1;
 	}