1 /* 2 * Copyright (C) 2015 Oracle. 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_slist.h" 20 #include "smatch_extra.h" 21 22 static int my_id; 23 24 STATE(positive); 25 STATE(ok); 26 27 static void ok_to_use(struct sm_state *sm, struct expression *mod_expr) 28 { 29 if (sm->state != &ok) 30 set_state(my_id, sm->name, sm->sym, &ok); 31 } 32 33 static void match_assign(const char *fn, struct expression *expr, void *unused) 34 { 35 set_state_expr(my_id, expr->left, &positive); 36 } 37 38 static void match_condition(struct expression *expr) 39 { 40 if (!get_state_expr(my_id, expr)) 41 return; 42 /* If the variable is zero that's ok */ 43 set_true_false_states_expr(my_id, expr, NULL, &ok); 44 } 45 46 static void match_return(struct expression *ret_value) 47 { 48 struct smatch_state *state; 49 struct sm_state *sm; 50 sval_t min; 51 52 sm = get_sm_state_expr(my_id, ret_value); 53 if (!sm) 54 return; 55 if (!slist_has_state(sm->possible, &positive)) 56 return; 57 state = get_state_expr(SMATCH_EXTRA, ret_value); 58 if (!state) 59 return; 60 if (!get_absolute_min(ret_value, &min)) 61 return; 62 if (min.value == 0) 63 return; 64 sm_warning("dma_mapping_error() doesn't return an error code"); 65 } 66 67 void check_dma_mapping_error(int id) 68 { 69 if (option_project != PROJ_KERNEL) 70 return; 71 72 my_id = id; 73 add_function_assign_hook("dma_mapping_error", &match_assign, NULL); 74 add_function_assign_hook("pci_dma_mapping_error", &match_assign, NULL); 75 add_hook(&match_condition, CONDITION_HOOK); 76 add_hook(&match_return, RETURN_HOOK); 77 add_modification_hook(my_id, &ok_to_use); 78 } 79