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 27 STATE(no_free); 28 STATE(ok); 29 30 static int my_id; 31 32 static 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 39 static 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 47 static 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 61 void 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