1/*
2 * Copyright (C) 2010 Dan Carpenter.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 */
17
18#include "smatch.h"
19#include "smatch_extra.h"
20#include "smatch_slist.h"
21
22static int my_id;
23
24#define MAX_ERRNO 4095
25
26STATE(added);
27STATE(not_added);
28
29static void match_added(const char *fn, struct expression *call_expr,
30			struct expression *assign_expr, void *unused)
31{
32	struct expression *arg_expr;
33
34	arg_expr = get_argument_from_call_expr(call_expr->args, 0);
35	set_state_expr(my_id, arg_expr, &added);
36}
37
38static void match_not_added(const char *fn, struct expression *call_expr,
39			struct expression *assign_expr, void *unused)
40{
41	struct expression *arg_expr;
42
43	arg_expr = get_argument_from_call_expr(call_expr->args, 0);
44	set_state_expr(my_id, arg_expr, &not_added);
45}
46
47static void match_platform_device_del(const char *fn, struct expression *expr, void *unused)
48{
49	struct expression *arg_expr;
50	struct sm_state *sm;
51
52	arg_expr = get_argument_from_call_expr(expr->args, 0);
53	sm = get_sm_state_expr(my_id, arg_expr);
54	if (!sm)
55		return;
56	if (!slist_has_state(sm->possible, &not_added))
57		return;
58	sm_warning("perhaps platform_device_put() was intended here?");
59}
60
61void check_platform_device_put(int id)
62{
63	if (option_project != PROJ_KERNEL)
64		return;
65	my_id = id;
66
67	return_implies_state("platform_device_add", 0, 0, &match_added, NULL);
68	return_implies_state("platform_device_add", -MAX_ERRNO, -1, &match_not_added, NULL);
69	add_function_hook("platform_device_del", &match_platform_device_del, NULL);
70}
71