check_platform_device_put.c

   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, &not_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, &not_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 }