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/*
19 * Don't call input_free_device() after calling
20 * input_unregister_device()
21 *
22 */
23
24#include "smatch.h"
25#include "smatch_slist.h"
26
27STATE(no_free);
28STATE(ok);
29
30static int my_id;
31
32static void match_assign(struct expression *expr)
33{
34	if (get_state_expr(my_id, expr->left)) {
35		set_state_expr(my_id, expr->left, &ok);
36	}
37}
38
39static void match_input_unregister(const char *fn, struct expression *expr, void *data)
40{
41	struct expression *arg;
42
43	arg = get_argument_from_call_expr(expr->args, 0);
44	set_state_expr(my_id, arg, &no_free);
45}
46
47static void match_input_free(const char *fn, struct expression *expr, void *data)
48{
49	struct expression *arg;
50	struct sm_state *sm;
51
52	arg = get_argument_from_call_expr(expr->args, 0);
53	sm = get_sm_state_expr(my_id, arg);
54	if (!sm)
55		return;
56	if (!slist_has_state(sm->possible, &no_free))
57		return;
58	sm_error("don't call input_free_device() after input_unregister_device()");
59}
60
61void check_input_free_device(int id)
62{
63	my_id = id;
64	if (option_project != PROJ_KERNEL)
65		return;
66	add_hook(&match_assign, ASSIGNMENT_HOOK);
67	add_function_hook("input_unregister_device", &match_input_unregister, NULL);
68	add_function_hook("input_free_device", &match_input_free, NULL);
69}
70