1*1f5207b7SJohn Levon /* 2*1f5207b7SJohn Levon * Copyright (C) 2015 Oracle. 3*1f5207b7SJohn Levon * 4*1f5207b7SJohn Levon * This program is free software; you can redistribute it and/or 5*1f5207b7SJohn Levon * modify it under the terms of the GNU General Public License 6*1f5207b7SJohn Levon * as published by the Free Software Foundation; either version 2 7*1f5207b7SJohn Levon * of the License, or (at your option) any later version. 8*1f5207b7SJohn Levon * 9*1f5207b7SJohn Levon * This program is distributed in the hope that it will be useful, 10*1f5207b7SJohn Levon * but WITHOUT ANY WARRANTY; without even the implied warranty of 11*1f5207b7SJohn Levon * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12*1f5207b7SJohn Levon * GNU General Public License for more details. 13*1f5207b7SJohn Levon * 14*1f5207b7SJohn Levon * You should have received a copy of the GNU General Public License 15*1f5207b7SJohn Levon * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt 16*1f5207b7SJohn Levon */ 17*1f5207b7SJohn Levon 18*1f5207b7SJohn Levon #include "smatch.h" 19*1f5207b7SJohn Levon #include "smatch_slist.h" 20*1f5207b7SJohn Levon #include "smatch_extra.h" 21*1f5207b7SJohn Levon 22*1f5207b7SJohn Levon static int my_id; 23*1f5207b7SJohn Levon 24*1f5207b7SJohn Levon STATE(positive); 25*1f5207b7SJohn Levon STATE(ok); 26*1f5207b7SJohn Levon 27*1f5207b7SJohn Levon static void ok_to_use(struct sm_state *sm, struct expression *mod_expr) 28*1f5207b7SJohn Levon { 29*1f5207b7SJohn Levon if (sm->state != &ok) 30*1f5207b7SJohn Levon set_state(my_id, sm->name, sm->sym, &ok); 31*1f5207b7SJohn Levon } 32*1f5207b7SJohn Levon 33*1f5207b7SJohn Levon static void match_assign(const char *fn, struct expression *expr, void *unused) 34*1f5207b7SJohn Levon { 35*1f5207b7SJohn Levon set_state_expr(my_id, expr->left, &positive); 36*1f5207b7SJohn Levon } 37*1f5207b7SJohn Levon 38*1f5207b7SJohn Levon static void match_condition(struct expression *expr) 39*1f5207b7SJohn Levon { 40*1f5207b7SJohn Levon if (!get_state_expr(my_id, expr)) 41*1f5207b7SJohn Levon return; 42*1f5207b7SJohn Levon /* If the variable is zero that's ok */ 43*1f5207b7SJohn Levon set_true_false_states_expr(my_id, expr, NULL, &ok); 44*1f5207b7SJohn Levon } 45*1f5207b7SJohn Levon 46*1f5207b7SJohn Levon static void match_return(struct expression *ret_value) 47*1f5207b7SJohn Levon { 48*1f5207b7SJohn Levon struct smatch_state *state; 49*1f5207b7SJohn Levon struct sm_state *sm; 50*1f5207b7SJohn Levon sval_t min; 51*1f5207b7SJohn Levon 52*1f5207b7SJohn Levon sm = get_sm_state_expr(my_id, ret_value); 53*1f5207b7SJohn Levon if (!sm) 54*1f5207b7SJohn Levon return; 55*1f5207b7SJohn Levon if (!slist_has_state(sm->possible, &positive)) 56*1f5207b7SJohn Levon return; 57*1f5207b7SJohn Levon state = get_state_expr(SMATCH_EXTRA, ret_value); 58*1f5207b7SJohn Levon if (!state) 59*1f5207b7SJohn Levon return; 60*1f5207b7SJohn Levon if (!get_absolute_min(ret_value, &min)) 61*1f5207b7SJohn Levon return; 62*1f5207b7SJohn Levon if (min.value == 0) 63*1f5207b7SJohn Levon return; 64*1f5207b7SJohn Levon sm_warning("dma_mapping_error() doesn't return an error code"); 65*1f5207b7SJohn Levon } 66*1f5207b7SJohn Levon 67*1f5207b7SJohn Levon void check_dma_mapping_error(int id) 68*1f5207b7SJohn Levon { 69*1f5207b7SJohn Levon if (option_project != PROJ_KERNEL) 70*1f5207b7SJohn Levon return; 71*1f5207b7SJohn Levon 72*1f5207b7SJohn Levon my_id = id; 73*1f5207b7SJohn Levon add_function_assign_hook("dma_mapping_error", &match_assign, NULL); 74*1f5207b7SJohn Levon add_function_assign_hook("pci_dma_mapping_error", &match_assign, NULL); 75*1f5207b7SJohn Levon add_hook(&match_condition, CONDITION_HOOK); 76*1f5207b7SJohn Levon add_hook(&match_return, RETURN_HOOK); 77*1f5207b7SJohn Levon add_modification_hook(my_id, &ok_to_use); 78*1f5207b7SJohn Levon } 79