1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
4 * Copyright (c) 2018 Xiao Yang <yangx.jy@cn.fujitsu.com>
5 */
6
7 /*
8 * AUTHOR: Madhu T L <madhu.tarikere@wipro.com>
9 *
10 * DESCRIPTION
11 * Verify that, delete_module(2) returns -1 and sets errno to EWOULDBLOCK,
12 * if tried to remove a module while other modules depend on this module.
13 */
14
15 #include <errno.h>
16 #include "tst_test.h"
17 #include "old_module.h"
18 #include "lapi/syscalls.h"
19
20 #define DUMMY_MOD "dummy_del_mod"
21 #define DUMMY_MOD_KO "dummy_del_mod.ko"
22 #define DUMMY_MOD_DEP_KO "dummy_del_mod_dep.ko"
23
24 static int dummy_mod_loaded;
25 static int dummy_mod_dep_loaded;
26
do_delete_module(void)27 static void do_delete_module(void)
28 {
29 TEST(tst_syscall(__NR_delete_module, DUMMY_MOD, 0));
30 if (TST_RET < 0) {
31 if (TST_ERR == EWOULDBLOCK) {
32 tst_res(TPASS | TTERRNO,
33 "delete_module() failed as expected");
34 } else {
35 tst_res(TFAIL | TTERRNO, "delete_module() failed "
36 "unexpectedly; expected: %s",
37 tst_strerrno(EWOULDBLOCK));
38 }
39 } else {
40 tst_res(TFAIL, "delete_module() succeeded unexpectedly");
41 dummy_mod_loaded = 0;
42 /*
43 * insmod DUMMY_MOD_KO again in case running
44 * with -i option
45 */
46 tst_module_load(NULL, DUMMY_MOD_KO, NULL);
47 dummy_mod_loaded = 1;
48 }
49 }
50
setup(void)51 static void setup(void)
52 {
53 /* Load first kernel module */
54 tst_module_load(NULL, DUMMY_MOD_KO, NULL);
55 dummy_mod_loaded = 1;
56
57 /* Load dependant kernel module */
58 tst_module_load(NULL, DUMMY_MOD_DEP_KO, NULL);
59 dummy_mod_dep_loaded = 1;
60 }
61
cleanup(void)62 static void cleanup(void)
63 {
64 /* Unload dependent kernel module */
65 if (dummy_mod_dep_loaded == 1)
66 tst_module_unload(NULL, DUMMY_MOD_DEP_KO);
67
68 /* Unload first kernel module */
69 if (dummy_mod_loaded == 1)
70 tst_module_unload(NULL, DUMMY_MOD_KO);
71 }
72
73 static struct tst_test test = {
74 .needs_root = 1,
75 .setup = setup,
76 .cleanup = cleanup,
77 .test_all = do_delete_module,
78 };
79