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 22 static int my_id; 23 24 #define MAX_ERRNO 4095 25 26 STATE(added); 27 STATE(not_added); 28 29 static 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 38 static 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, ¬_added); 45 } 46 47 static 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, ¬_added)) 57 return; 58 sm_warning("perhaps platform_device_put() was intended here?"); 59 } 60 61 void 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 }