Commit | Line | Data |
---|---|---|
096102bd DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com> | |
fbb9748b | 3 | * 2014 - Jan Glauber <jan.glauber@gmail.com> |
096102bd | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
096102bd | 8 | * |
d14d33bf AM |
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. | |
096102bd | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
096102bd DG |
17 | */ |
18 | ||
d11b2027 MJ |
19 | /** |
20 | * @file modprobe.c | |
21 | * | |
22 | * @brief modprobe related functions. | |
23 | * | |
24 | */ | |
25 | ||
6c1c0768 | 26 | #define _LGPL_SOURCE |
c9d42407 | 27 | #include <assert.h> |
096102bd DG |
28 | #include <stdio.h> |
29 | #include <stdlib.h> | |
30 | #include <sys/wait.h> | |
31 | ||
32 | #include <common/common.h> | |
fbb9748b | 33 | #include <common/utils.h> |
096102bd DG |
34 | |
35 | #include "modprobe.h" | |
36 | #include "kern-modules.h" | |
37 | ||
ab57d7d3 JG |
38 | #define LTTNG_MOD_REQUIRED 1 |
39 | #define LTTNG_MOD_OPTIONAL 0 | |
40 | ||
41 | /* LTTng kernel tracer mandatory core modules list */ | |
42 | struct kern_modules_param kern_modules_control_core[] = { | |
ab57d7d3 JG |
43 | { "lttng-ring-buffer-client-discard" }, |
44 | { "lttng-ring-buffer-client-overwrite" }, | |
45 | { "lttng-ring-buffer-metadata-client" }, | |
46 | { "lttng-ring-buffer-client-mmap-discard" }, | |
47 | { "lttng-ring-buffer-client-mmap-overwrite" }, | |
48 | { "lttng-ring-buffer-metadata-mmap-client" }, | |
49 | }; | |
50 | ||
3fa9646c | 51 | /* LTTng kernel tracer probe modules list */ |
fbb9748b | 52 | struct kern_modules_param kern_modules_probes_default[] = { |
ab57d7d3 JG |
53 | { "lttng-probe-asoc" }, |
54 | { "lttng-probe-block" }, | |
55 | { "lttng-probe-btrfs" }, | |
56 | { "lttng-probe-compaction" }, | |
57 | { "lttng-probe-ext3" }, | |
58 | { "lttng-probe-ext4" }, | |
59 | { "lttng-probe-gpio" }, | |
60 | { "lttng-probe-irq" }, | |
61 | { "lttng-probe-jbd" }, | |
62 | { "lttng-probe-jbd2" }, | |
63 | { "lttng-probe-kmem" }, | |
64 | { "lttng-probe-kvm" }, | |
65 | { "lttng-probe-kvm-x86" }, | |
66 | { "lttng-probe-kvm-x86-mmu" }, | |
67 | { "lttng-probe-lock" }, | |
68 | { "lttng-probe-module" }, | |
69 | { "lttng-probe-napi" }, | |
70 | { "lttng-probe-net" }, | |
71 | { "lttng-probe-power" }, | |
72 | { "lttng-probe-printk" }, | |
73 | { "lttng-probe-random" }, | |
74 | { "lttng-probe-rcu" }, | |
75 | { "lttng-probe-regmap" }, | |
76 | { "lttng-probe-regulator" }, | |
77 | { "lttng-probe-rpm" }, | |
78 | { "lttng-probe-sched" }, | |
79 | { "lttng-probe-scsi" }, | |
80 | { "lttng-probe-signal" }, | |
81 | { "lttng-probe-skb" }, | |
82 | { "lttng-probe-sock" }, | |
83 | { "lttng-probe-statedump" }, | |
84 | { "lttng-probe-sunrpc" }, | |
85 | { "lttng-probe-timer" }, | |
86 | { "lttng-probe-udp" }, | |
87 | { "lttng-probe-vmscan" }, | |
88 | { "lttng-probe-v4l2" }, | |
89 | { "lttng-probe-workqueue" }, | |
90 | { "lttng-probe-writeback" }, | |
c66dfab8 | 91 | { "lttng-probe-x86-irq-vectors" }, |
037e00be | 92 | { "lttng-probe-x86-exceptions" }, |
096102bd DG |
93 | }; |
94 | ||
fbb9748b JG |
95 | /* dynamic probe modules list */ |
96 | static struct kern_modules_param *probes; | |
97 | static int nr_probes; | |
c9d42407 | 98 | static int probes_capacity; |
fbb9748b | 99 | |
234170ac UTL |
100 | #if HAVE_KMOD |
101 | #include <libkmod.h> | |
866c17ce | 102 | |
d11b2027 MJ |
103 | /** |
104 | * @brief Logging function for libkmod integration. | |
105 | */ | |
234170ac UTL |
106 | static void log_kmod(void *data, int priority, const char *file, int line, |
107 | const char *fn, const char *format, va_list args) | |
108 | { | |
109 | char *str; | |
110 | ||
111 | if (vasprintf(&str, format, args) < 0) { | |
112 | return; | |
113 | } | |
114 | ||
115 | DBG("libkmod: %s", str); | |
116 | free(str); | |
117 | } | |
866c17ce | 118 | |
d11b2027 MJ |
119 | /** |
120 | * @brief Setup the libkmod context. | |
121 | * | |
122 | * Create the context, add a custom logging function and preload the | |
123 | * ressources for faster operation. | |
124 | * | |
125 | * @returns \c 0 on success | |
126 | * \c < 0 on error | |
127 | */ | |
866c17ce | 128 | static int setup_kmod_ctx(struct kmod_ctx **ctx) |
234170ac | 129 | { |
866c17ce | 130 | int ret = 0; |
234170ac | 131 | |
866c17ce | 132 | *ctx = kmod_new(NULL, NULL); |
234170ac UTL |
133 | if (!ctx) { |
134 | PERROR("Unable to create kmod library context"); | |
135 | ret = -ENOMEM; | |
136 | goto error; | |
137 | } | |
138 | ||
866c17ce MJ |
139 | kmod_set_log_fn(*ctx, log_kmod, NULL); |
140 | ret = kmod_load_resources(*ctx); | |
141 | if (ret < 0) { | |
142 | ERR("Failed to load kmod library resources"); | |
143 | goto error; | |
144 | } | |
145 | ||
146 | error: | |
147 | return ret; | |
148 | } | |
149 | ||
d11b2027 MJ |
150 | /** |
151 | * @brief Loads the kernel modules in \p modules | |
152 | * | |
153 | * @param modules List of modules to load | |
154 | * @param entries Number of modules in the list | |
155 | * @param required Are the modules required or optionnal | |
156 | * | |
157 | * If the modules are required, we will return with error after the | |
158 | * first failed module load, otherwise we continue loading. | |
159 | * | |
160 | * @returns \c 0 on success | |
161 | * \c < 0 on error | |
162 | */ | |
866c17ce MJ |
163 | static int modprobe_lttng(struct kern_modules_param *modules, |
164 | int entries, int required) | |
165 | { | |
166 | int ret = 0, i; | |
167 | struct kmod_ctx *ctx; | |
168 | ||
169 | ret = setup_kmod_ctx(&ctx); | |
170 | if (ret < 0) { | |
171 | goto error; | |
172 | } | |
234170ac UTL |
173 | |
174 | for (i = 0; i < entries; i++) { | |
175 | struct kmod_module *mod = NULL; | |
176 | ||
177 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
178 | if (ret < 0) { | |
179 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
180 | goto error; | |
181 | } | |
182 | ||
0b1e16b8 | 183 | ret = kmod_module_probe_insert_module(mod, 0, |
234170ac | 184 | NULL, NULL, NULL, NULL); |
0b1e16b8 MJ |
185 | if (ret == -EEXIST) { |
186 | DBG("Module %s is already loaded", modules[i].name); | |
187 | ret = 0; | |
188 | } else if (ret < 0) { | |
16c2e854 PP |
189 | if (required) { |
190 | ERR("Unable to load required module %s", | |
191 | modules[i].name); | |
192 | goto error; | |
193 | } else { | |
194 | DBG("Unable to load optional module %s; continuing", | |
195 | modules[i].name); | |
196 | ret = 0; | |
197 | } | |
234170ac UTL |
198 | } else { |
199 | DBG("Modprobe successfully %s", modules[i].name); | |
e6a9d253 | 200 | modules[i].loaded = true; |
234170ac UTL |
201 | } |
202 | ||
203 | kmod_module_unref(mod); | |
204 | } | |
205 | ||
206 | error: | |
207 | if (ctx) { | |
208 | kmod_unref(ctx); | |
209 | } | |
210 | return ret; | |
211 | } | |
212 | ||
d11b2027 MJ |
213 | /** |
214 | * @brief Recursively unload modules. | |
215 | * | |
216 | * This function implements the same modules unloading behavior as | |
217 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
218 | * dependencies and unload modules with a refcount of 0. | |
219 | * | |
220 | * @param mod The module to unload | |
221 | * | |
222 | * @returns \c 0 on success | |
223 | * \c < 0 on error | |
224 | */ | |
866c17ce MJ |
225 | static int rmmod_recurse(struct kmod_module *mod) { |
226 | int ret = 0; | |
227 | struct kmod_list *deps, *itr; | |
228 | ||
229 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
230 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
231 | return ret; | |
232 | } | |
233 | ||
234 | ret = kmod_module_remove_module(mod, 0); | |
235 | ||
236 | deps = kmod_module_get_dependencies(mod); | |
237 | if (deps != NULL) { | |
238 | kmod_list_foreach(itr, deps) { | |
239 | struct kmod_module *dep = kmod_module_get_module(itr); | |
240 | if (kmod_module_get_refcnt(dep) == 0) { | |
241 | DBG("Recursive remove module %s", | |
242 | kmod_module_get_name(dep)); | |
243 | rmmod_recurse(dep); | |
244 | } | |
245 | kmod_module_unref(dep); | |
246 | } | |
247 | kmod_module_unref_list(deps); | |
248 | } | |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
d11b2027 MJ |
253 | /** |
254 | * @brief Unloads the kernel modules in \p modules | |
255 | * | |
256 | * @param modules List of modules to unload | |
257 | * @param entries Number of modules in the list | |
258 | * @param required Are the modules required or optionnal | |
259 | * | |
260 | */ | |
866c17ce MJ |
261 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
262 | int entries, int required) | |
263 | { | |
264 | int ret = 0, i; | |
265 | struct kmod_ctx *ctx; | |
266 | ||
267 | ret = setup_kmod_ctx(&ctx); | |
268 | if (ret < 0) { | |
269 | goto error; | |
270 | } | |
271 | ||
272 | for (i = entries - 1; i >= 0; i--) { | |
273 | struct kmod_module *mod = NULL; | |
274 | ||
e6a9d253 JG |
275 | if (!modules[i].loaded) { |
276 | continue; | |
277 | } | |
278 | ||
866c17ce MJ |
279 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
280 | if (ret < 0) { | |
281 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
282 | goto error; | |
283 | } | |
284 | ||
285 | ret = rmmod_recurse(mod); | |
286 | if (ret == -EEXIST) { | |
287 | DBG("Module %s is not in kernel.", modules[i].name); | |
288 | } else if (required && ret < 0) { | |
289 | ERR("Unable to remove module %s", modules[i].name); | |
290 | } else { | |
291 | DBG("Modprobe removal successful %s", | |
292 | modules[i].name); | |
293 | } | |
294 | ||
295 | kmod_module_unref(mod); | |
296 | } | |
297 | ||
298 | error: | |
299 | if (ctx) { | |
300 | kmod_unref(ctx); | |
301 | } | |
302 | } | |
303 | ||
234170ac UTL |
304 | #else /* HAVE_KMOD */ |
305 | ||
fbb9748b | 306 | static int modprobe_lttng(struct kern_modules_param *modules, |
234170ac | 307 | int entries, int required) |
096102bd DG |
308 | { |
309 | int ret = 0, i; | |
310 | char modprobe[256]; | |
311 | ||
e23b81ed | 312 | for (i = 0; i < entries; i++) { |
096102bd DG |
313 | ret = snprintf(modprobe, sizeof(modprobe), |
314 | "/sbin/modprobe %s%s", | |
ab57d7d3 | 315 | required ? "" : "-q ", |
e23b81ed | 316 | modules[i].name); |
096102bd DG |
317 | if (ret < 0) { |
318 | PERROR("snprintf modprobe"); | |
319 | goto error; | |
320 | } | |
321 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
322 | ret = system(modprobe); | |
323 | if (ret == -1) { | |
16c2e854 PP |
324 | if (required) { |
325 | ERR("Unable to launch modprobe for required module %s", | |
326 | modules[i].name); | |
327 | goto error; | |
328 | } else { | |
329 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
330 | modules[i].name); | |
331 | ret = 0; | |
332 | } | |
333 | } else if (WEXITSTATUS(ret) != 0) { | |
334 | if (required) { | |
335 | ERR("Unable to load required module %s", | |
336 | modules[i].name); | |
337 | goto error; | |
338 | } else { | |
339 | DBG("Unable to load optional module %s; continuing", | |
340 | modules[i].name); | |
341 | ret = 0; | |
342 | } | |
096102bd | 343 | } else { |
ab57d7d3 | 344 | DBG("Modprobe successfully %s", modules[i].name); |
b98ed3e5 | 345 | modules[i].loaded = true; |
096102bd DG |
346 | } |
347 | } | |
348 | ||
349 | error: | |
350 | return ret; | |
351 | } | |
352 | ||
35e090b7 MJ |
353 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
354 | int entries, int required) | |
355 | { | |
356 | int ret = 0, i; | |
357 | char modprobe[256]; | |
358 | ||
359 | for (i = entries - 1; i >= 0; i--) { | |
e6a9d253 JG |
360 | if (!modules[i].loaded) { |
361 | continue; | |
362 | } | |
35e090b7 MJ |
363 | ret = snprintf(modprobe, sizeof(modprobe), |
364 | "/sbin/modprobe -r -q %s", | |
365 | modules[i].name); | |
366 | if (ret < 0) { | |
367 | PERROR("snprintf modprobe -r"); | |
368 | return; | |
369 | } | |
370 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
371 | ret = system(modprobe); | |
372 | if (ret == -1) { | |
373 | ERR("Unable to launch modprobe -r for module %s", | |
374 | modules[i].name); | |
375 | } else if (required && WEXITSTATUS(ret) != 0) { | |
376 | ERR("Unable to remove module %s", | |
377 | modules[i].name); | |
378 | } else { | |
379 | DBG("Modprobe removal successful %s", | |
380 | modules[i].name); | |
381 | } | |
382 | } | |
383 | } | |
384 | ||
866c17ce MJ |
385 | #endif /* HAVE_KMOD */ |
386 | ||
35e090b7 MJ |
387 | /* |
388 | * Remove control kernel module(s) in reverse load order. | |
389 | */ | |
390 | void modprobe_remove_lttng_control(void) | |
391 | { | |
392 | modprobe_remove_lttng(kern_modules_control_core, | |
393 | ARRAY_SIZE(kern_modules_control_core), | |
394 | LTTNG_MOD_REQUIRED); | |
395 | } | |
396 | ||
397 | static void free_probes(void) | |
398 | { | |
399 | int i; | |
400 | ||
401 | if (!probes) { | |
402 | return; | |
403 | } | |
404 | for (i = 0; i < nr_probes; ++i) { | |
405 | free(probes[i].name); | |
406 | } | |
407 | free(probes); | |
408 | probes = NULL; | |
409 | nr_probes = 0; | |
410 | } | |
411 | ||
412 | /* | |
413 | * Remove data kernel modules in reverse load order. | |
414 | */ | |
415 | void modprobe_remove_lttng_data(void) | |
416 | { | |
417 | if (!probes) { | |
418 | return; | |
419 | } | |
420 | modprobe_remove_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); | |
421 | free_probes(); | |
422 | } | |
423 | ||
424 | /* | |
425 | * Remove all kernel modules in reverse order. | |
426 | */ | |
427 | void modprobe_remove_lttng_all(void) | |
428 | { | |
429 | modprobe_remove_lttng_data(); | |
430 | modprobe_remove_lttng_control(); | |
431 | } | |
432 | ||
e23b81ed JG |
433 | /* |
434 | * Load control kernel module(s). | |
435 | */ | |
436 | int modprobe_lttng_control(void) | |
437 | { | |
ab57d7d3 JG |
438 | int ret; |
439 | ||
440 | ret = modprobe_lttng(kern_modules_control_core, | |
441 | ARRAY_SIZE(kern_modules_control_core), | |
442 | LTTNG_MOD_REQUIRED); | |
ab57d7d3 | 443 | return ret; |
e23b81ed | 444 | } |
ab57d7d3 | 445 | |
c9d42407 PP |
446 | /** |
447 | * Grow global list of probes (double capacity or set it to 1 if | |
448 | * currently 0 and copy existing data). | |
096102bd | 449 | */ |
c9d42407 | 450 | static int grow_probes(void) |
096102bd | 451 | { |
c9d42407 PP |
452 | int i; |
453 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 454 | |
c9d42407 PP |
455 | /* Initialize capacity to 1 if 0. */ |
456 | if (probes_capacity == 0) { | |
457 | probes = zmalloc(sizeof(*probes)); | |
458 | if (!probes) { | |
459 | PERROR("malloc probe list"); | |
460 | return -ENOMEM; | |
461 | } | |
462 | ||
463 | probes_capacity = 1; | |
464 | return 0; | |
fbb9748b JG |
465 | } |
466 | ||
c9d42407 PP |
467 | /* Double size. */ |
468 | probes_capacity *= 2; | |
469 | ||
470 | tmp_probes = zmalloc(sizeof(*tmp_probes) * probes_capacity); | |
471 | if (!tmp_probes) { | |
fbb9748b JG |
472 | PERROR("malloc probe list"); |
473 | return -ENOMEM; | |
474 | } | |
475 | ||
c9d42407 PP |
476 | for (i = 0; i < nr_probes; ++i) { |
477 | /* Move name pointer. */ | |
478 | tmp_probes[i].name = probes[i].name; | |
479 | } | |
480 | ||
481 | /* Replace probes with larger copy. */ | |
482 | free(probes); | |
483 | probes = tmp_probes; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | /* | |
489 | * Appends a comma-separated list of probes to the global list | |
490 | * of probes. | |
491 | */ | |
492 | static int append_list_to_probes(const char *list) | |
493 | { | |
494 | char *next; | |
d3c04b7c | 495 | int ret; |
44603c80 | 496 | char *tmp_list, *cur_list; |
c9d42407 PP |
497 | |
498 | assert(list); | |
499 | ||
44603c80 | 500 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
501 | if (!tmp_list) { |
502 | PERROR("strdup temp list"); | |
503 | return -ENOMEM; | |
504 | } | |
505 | ||
506 | for (;;) { | |
fbb9748b | 507 | size_t name_len; |
c9d42407 | 508 | struct kern_modules_param *cur_mod; |
fbb9748b | 509 | |
44603c80 | 510 | next = strtok(cur_list, ","); |
fbb9748b | 511 | if (!next) { |
c9d42407 | 512 | break; |
fbb9748b | 513 | } |
44603c80 | 514 | cur_list = NULL; |
fbb9748b JG |
515 | |
516 | /* filter leading spaces */ | |
517 | while (*next == ' ') { | |
518 | next++; | |
519 | } | |
520 | ||
c9d42407 PP |
521 | if (probes_capacity <= nr_probes) { |
522 | ret = grow_probes(); | |
523 | if (ret) { | |
398d5459 | 524 | goto error; |
c9d42407 PP |
525 | } |
526 | } | |
527 | ||
fbb9748b JG |
528 | /* Length 13 is "lttng-probe-" + \0 */ |
529 | name_len = strlen(next) + 13; | |
530 | ||
d3c04b7c | 531 | cur_mod = &probes[nr_probes]; |
c9d42407 PP |
532 | cur_mod->name = zmalloc(name_len); |
533 | if (!cur_mod->name) { | |
fbb9748b | 534 | PERROR("malloc probe list"); |
398d5459 MD |
535 | ret = -ENOMEM; |
536 | goto error; | |
fbb9748b JG |
537 | } |
538 | ||
c9d42407 | 539 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
540 | if (ret < 0) { |
541 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
542 | ret = -ENOMEM; |
543 | goto error; | |
fbb9748b | 544 | } |
c9d42407 | 545 | |
c9d42407 | 546 | nr_probes++; |
fbb9748b JG |
547 | } |
548 | ||
c9d42407 | 549 | free(tmp_list); |
c9d42407 | 550 | return 0; |
398d5459 MD |
551 | |
552 | error: | |
553 | free(tmp_list); | |
554 | free_probes(); | |
555 | return ret; | |
c9d42407 PP |
556 | } |
557 | ||
558 | /* | |
559 | * Load data kernel module(s). | |
560 | */ | |
561 | int modprobe_lttng_data(void) | |
562 | { | |
563 | int ret, i; | |
564 | char *list; | |
565 | ||
566 | /* | |
567 | * Base probes: either from command line option, environment | |
568 | * variable or default list. | |
569 | */ | |
570 | if (kmod_probes_list) { | |
571 | list = kmod_probes_list; | |
572 | } else { | |
573 | list = utils_get_kmod_probes_list(); | |
574 | } | |
575 | ||
576 | if (list) { | |
577 | /* User-specified probes. */ | |
578 | ret = append_list_to_probes(list); | |
c9d42407 PP |
579 | if (ret) { |
580 | return ret; | |
581 | } | |
582 | } else { | |
583 | /* Default probes. */ | |
584 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 585 | |
62e0422e | 586 | probes = zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
587 | if (!probes) { |
588 | PERROR("malloc probe list"); | |
589 | return -ENOMEM; | |
590 | } | |
591 | ||
592 | nr_probes = probes_capacity = def_len; | |
593 | ||
594 | for (i = 0; i < def_len; ++i) { | |
595 | char* name = strdup(kern_modules_probes_default[i].name); | |
596 | ||
597 | if (!name) { | |
598 | PERROR("strdup probe item"); | |
398d5459 MD |
599 | ret = -ENOMEM; |
600 | goto error; | |
c9d42407 PP |
601 | } |
602 | ||
603 | probes[i].name = name; | |
604 | } | |
605 | } | |
606 | ||
607 | /* | |
608 | * Extra modules? Append them to current probes list. | |
609 | */ | |
610 | if (kmod_extra_probes_list) { | |
611 | list = kmod_extra_probes_list; | |
612 | } else { | |
613 | list = utils_get_extra_kmod_probes_list(); | |
614 | } | |
615 | ||
616 | if (list) { | |
617 | ret = append_list_to_probes(list); | |
618 | if (ret) { | |
398d5459 | 619 | goto error; |
c9d42407 PP |
620 | } |
621 | } | |
622 | ||
623 | /* | |
624 | * Load probes modules now. | |
625 | */ | |
398d5459 MD |
626 | ret = modprobe_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); |
627 | if (ret) { | |
628 | goto error; | |
629 | } | |
630 | return ret; | |
631 | ||
632 | error: | |
633 | free_probes(); | |
634 | return ret; | |
096102bd | 635 | } |