(closes issue #12689)

Reported by: ys

Many thanks to ys for doing the research on this problem.
I didn't think it would be best to unlock the contexts
and then relock them after the remove_extension2() call,
so I added an extra arg to remove_extension2() and set it
appropriately in each call. There were not that many.

I considered forcing the code to lock the contexts before
the call to remove_extension2(), but that would require
a slightly greater degree of changes, especially since
the find_context_locked is local to pbx.c

I did a simple sanity test to make sure the code doesn't
mess things up in general.




git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@123165 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_dial.c

@@ -2098,7 +2098,7 @@ static int unload_module(void)
 	res |= ast_unregister_application(rapp);
 
 	if ((con = ast_context_find("app_dial_gosub_virtual_context"))) {
-		ast_context_remove_extension2(con, "s", 1, NULL);
+		ast_context_remove_extension2(con, "s", 1, NULL, 0);
 		ast_context_destroy(con, "app_dial"); /* leave nothing behind */
 	}
 

apps/app_queue.c

@@ -6366,7 +6366,7 @@ static int unload_module(void)
 		ast_event_unsubscribe(device_state_sub);
 
 	if ((con = ast_context_find("app_queue_gosub_virtual_context"))) {
-		ast_context_remove_extension2(con, "s", 1, NULL);
+		ast_context_remove_extension2(con, "s", 1, NULL, 0);
 		ast_context_destroy(con, "app_queue"); /* leave no trace */
 	}
 

apps/app_stack.c

@@ -496,7 +496,7 @@ static int unload_module(void)
 		ast_agi_unregister(ast_module_info->self, &gosub_agi_command);
 
 		if ((con = ast_context_find("app_stack_gosub_virtual_context"))) {
-			ast_context_remove_extension2(con, "s", 1, NULL);
+			ast_context_remove_extension2(con, "s", 1, NULL, 0);
 			ast_context_destroy(con, "app_stack"); /* leave nothing behind */
 		}
 	}

include/asterisk/pbx.h

@@ -600,7 +600,7 @@ int ast_context_remove_extension(const char *context, const char *extension, int
 	const char *registrar);
 
 int ast_context_remove_extension2(struct ast_context *con, const char *extension,
-	int priority, const char *registrar);
+	int priority, const char *registrar, int already_locked);
 
 /*! 
  * \brief Add an ignorepat

main/features.c

@@ -2465,7 +2465,7 @@ int manage_parkinglot(struct ast_parkinglot *curlot, fd_set *rfds, fd_set *efds,
 			/* And take them out of the parking lot */
 			con = ast_context_find(pu->parkinglot->parking_con);
 			if (con) {
-				if (ast_context_remove_extension2(con, pu->parkingexten, 1, NULL))
+				if (ast_context_remove_extension2(con, pu->parkingexten, 1, NULL, 0))
 					ast_log(LOG_WARNING, "Whoa, failed to remove the parking extension!\n");
 				else
 					notify_metermaids(pu->parkingexten, curlot->parking_con, AST_DEVICE_NOT_INUSE);
@@ -2500,7 +2500,7 @@ int manage_parkinglot(struct ast_parkinglot *curlot, fd_set *rfds, fd_set *efds,
 					/* And take them out of the parking lot */
 					con = ast_context_find(curlot->parking_con);
 					if (con) {
-						if (ast_context_remove_extension2(con, pu->parkingexten, 1, NULL))
+						if (ast_context_remove_extension2(con, pu->parkingexten, 1, NULL, 0))
 							ast_log(LOG_WARNING, "Whoa, failed to remove the extension!\n");
 						else
 							notify_metermaids(pu->parkingexten, curlot->parking_con, AST_DEVICE_NOT_INUSE);
@@ -2721,7 +2721,7 @@ static int park_exec_full(struct ast_channel *chan, void *data, struct ast_parki
 		peer = pu->chan;
 		con = ast_context_find(parkinglot->parking_con);
 		if (con) {
-			if (ast_context_remove_extension2(con, pu->parkingexten, 1, NULL))
+			if (ast_context_remove_extension2(con, pu->parkingexten, 1, NULL, 0))
 				ast_log(LOG_WARNING, "Whoa, failed to remove the extension!\n");
 			else
 				notify_metermaids(pu->parkingexten, parkinglot->parking_con, AST_DEVICE_NOT_INUSE);
@@ -3284,7 +3284,7 @@ static int load_config(void)
 
 	/* Remove the old parking extension */
 	if (!ast_strlen_zero(old_parking_con) && (con = ast_context_find(old_parking_con)))	{
-		if(ast_context_remove_extension2(con, old_parking_ext, 1, registrar))
+		if(ast_context_remove_extension2(con, old_parking_ext, 1, registrar, 0))
 				notify_metermaids(old_parking_ext, old_parking_con, AST_DEVICE_NOT_INUSE);
 		ast_debug(1, "Removed old parking extension %s@%s\n", old_parking_ext, old_parking_con);
 	}

main/pbx.c

@@ -4022,7 +4022,7 @@ int ast_context_remove_extension(const char *context, const char *extension, int
 	struct ast_context *c = find_context_locked(context);
 
 	if (c) { /* ... remove extension ... */
-		ret = ast_context_remove_extension2(c, extension, priority, registrar);
+		ret = ast_context_remove_extension2(c, extension, priority, registrar, 1);
 		ast_unlock_contexts();
 	}
 	return ret;
@@ -4038,14 +4038,15 @@ int ast_context_remove_extension(const char *context, const char *extension, int
  * it.
  *
  */
-int ast_context_remove_extension2(struct ast_context *con, const char *extension, int priority, const char *registrar)
+int ast_context_remove_extension2(struct ast_context *con, const char *extension, int priority, const char *registrar, int already_locked)
 {
 	struct ast_exten *exten, *prev_exten = NULL;
 	struct ast_exten *peer;
 	struct ast_exten ex, *exten2, *exten3;
 	char dummy_name[1024];
 
-	ast_wrlock_context(con);
+	if (!already_locked)
+		ast_wrlock_context(con);
 
 	/* Handle this is in the new world */
 
@@ -4132,7 +4133,8 @@ int ast_context_remove_extension2(struct ast_context *con, const char *extension
 	}
 	if (!exten) {
 		/* we can't find right extension */
-		ast_unlock_context(con);
+		if (!already_locked)
+			ast_unlock_context(con);
 		return -1;
 	}
 
@@ -4159,7 +4161,8 @@ int ast_context_remove_extension2(struct ast_context *con, const char *extension
 				break; /* found our priority */
 		}
 		if (!peer) { /* not found */
-			ast_unlock_context(con);
+			if (!already_locked)
+				ast_unlock_context(con);
 			return -1;
 		}
 		/* we are first priority extension? */
@@ -4192,7 +4195,8 @@ int ast_context_remove_extension2(struct ast_context *con, const char *extension
 		destroy_exten(peer);
 		/* XXX should we return -1 ? */
 	}
-	ast_unlock_context(con);
+	if (!already_locked)
+		ast_unlock_context(con);
 	return 0;
 }
 
@@ -7177,7 +7181,7 @@ void __ast_context_destroy(struct ast_context *list, struct ast_hashtab *context
 						ast_verb(3, "Remove %s/%s/%d, registrar=%s; con=%s(%p); con->root=%p\n",
 								tmp->name, prio_item->exten, prio_item->priority, registrar, con? con->name : "<nil>", con, con? con->root_table: NULL);
 						
-						ast_context_remove_extension2(tmp, prio_item->exten, prio_item->priority, registrar);
+						ast_context_remove_extension2(tmp, prio_item->exten, prio_item->priority, registrar, 1);
 					}
 					ast_hashtab_end_traversal(prio_iter);
 				}