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" | |
e6142f2e | 37 | #include "lttng-sessiond.h" |
096102bd | 38 | |
ab57d7d3 JG |
39 | #define LTTNG_MOD_REQUIRED 1 |
40 | #define LTTNG_MOD_OPTIONAL 0 | |
41 | ||
42 | /* LTTng kernel tracer mandatory core modules list */ | |
43 | struct kern_modules_param kern_modules_control_core[] = { | |
ab57d7d3 JG |
44 | { "lttng-ring-buffer-client-discard" }, |
45 | { "lttng-ring-buffer-client-overwrite" }, | |
46 | { "lttng-ring-buffer-metadata-client" }, | |
47 | { "lttng-ring-buffer-client-mmap-discard" }, | |
48 | { "lttng-ring-buffer-client-mmap-overwrite" }, | |
49 | { "lttng-ring-buffer-metadata-mmap-client" }, | |
50 | }; | |
51 | ||
3fa9646c | 52 | /* LTTng kernel tracer probe modules list */ |
fbb9748b | 53 | struct kern_modules_param kern_modules_probes_default[] = { |
ab57d7d3 JG |
54 | { "lttng-probe-asoc" }, |
55 | { "lttng-probe-block" }, | |
56 | { "lttng-probe-btrfs" }, | |
57 | { "lttng-probe-compaction" }, | |
58 | { "lttng-probe-ext3" }, | |
59 | { "lttng-probe-ext4" }, | |
60 | { "lttng-probe-gpio" }, | |
0b1c5ad5 | 61 | { "lttng-probe-i2c" }, |
ab57d7d3 JG |
62 | { "lttng-probe-irq" }, |
63 | { "lttng-probe-jbd" }, | |
64 | { "lttng-probe-jbd2" }, | |
65 | { "lttng-probe-kmem" }, | |
66 | { "lttng-probe-kvm" }, | |
67 | { "lttng-probe-kvm-x86" }, | |
68 | { "lttng-probe-kvm-x86-mmu" }, | |
69 | { "lttng-probe-lock" }, | |
70 | { "lttng-probe-module" }, | |
71 | { "lttng-probe-napi" }, | |
72 | { "lttng-probe-net" }, | |
73 | { "lttng-probe-power" }, | |
bc6bc7c5 | 74 | { "lttng-probe-preemptirq" }, |
ab57d7d3 JG |
75 | { "lttng-probe-printk" }, |
76 | { "lttng-probe-random" }, | |
77 | { "lttng-probe-rcu" }, | |
78 | { "lttng-probe-regmap" }, | |
79 | { "lttng-probe-regulator" }, | |
80 | { "lttng-probe-rpm" }, | |
81 | { "lttng-probe-sched" }, | |
82 | { "lttng-probe-scsi" }, | |
83 | { "lttng-probe-signal" }, | |
84 | { "lttng-probe-skb" }, | |
85 | { "lttng-probe-sock" }, | |
86 | { "lttng-probe-statedump" }, | |
87 | { "lttng-probe-sunrpc" }, | |
88 | { "lttng-probe-timer" }, | |
89 | { "lttng-probe-udp" }, | |
90 | { "lttng-probe-vmscan" }, | |
91 | { "lttng-probe-v4l2" }, | |
92 | { "lttng-probe-workqueue" }, | |
93 | { "lttng-probe-writeback" }, | |
c66dfab8 | 94 | { "lttng-probe-x86-irq-vectors" }, |
037e00be | 95 | { "lttng-probe-x86-exceptions" }, |
096102bd DG |
96 | }; |
97 | ||
fbb9748b JG |
98 | /* dynamic probe modules list */ |
99 | static struct kern_modules_param *probes; | |
100 | static int nr_probes; | |
c9d42407 | 101 | static int probes_capacity; |
fbb9748b | 102 | |
234170ac UTL |
103 | #if HAVE_KMOD |
104 | #include <libkmod.h> | |
866c17ce | 105 | |
d11b2027 MJ |
106 | /** |
107 | * @brief Logging function for libkmod integration. | |
108 | */ | |
234170ac UTL |
109 | static void log_kmod(void *data, int priority, const char *file, int line, |
110 | const char *fn, const char *format, va_list args) | |
111 | { | |
112 | char *str; | |
113 | ||
114 | if (vasprintf(&str, format, args) < 0) { | |
115 | return; | |
116 | } | |
117 | ||
118 | DBG("libkmod: %s", str); | |
119 | free(str); | |
120 | } | |
866c17ce | 121 | |
d11b2027 MJ |
122 | /** |
123 | * @brief Setup the libkmod context. | |
124 | * | |
125 | * Create the context, add a custom logging function and preload the | |
126 | * ressources for faster operation. | |
127 | * | |
128 | * @returns \c 0 on success | |
129 | * \c < 0 on error | |
130 | */ | |
866c17ce | 131 | static int setup_kmod_ctx(struct kmod_ctx **ctx) |
234170ac | 132 | { |
866c17ce | 133 | int ret = 0; |
234170ac | 134 | |
866c17ce | 135 | *ctx = kmod_new(NULL, NULL); |
234170ac UTL |
136 | if (!ctx) { |
137 | PERROR("Unable to create kmod library context"); | |
138 | ret = -ENOMEM; | |
139 | goto error; | |
140 | } | |
141 | ||
866c17ce MJ |
142 | kmod_set_log_fn(*ctx, log_kmod, NULL); |
143 | ret = kmod_load_resources(*ctx); | |
144 | if (ret < 0) { | |
145 | ERR("Failed to load kmod library resources"); | |
146 | goto error; | |
147 | } | |
148 | ||
149 | error: | |
150 | return ret; | |
151 | } | |
152 | ||
d11b2027 MJ |
153 | /** |
154 | * @brief Loads the kernel modules in \p modules | |
155 | * | |
156 | * @param modules List of modules to load | |
157 | * @param entries Number of modules in the list | |
158 | * @param required Are the modules required or optionnal | |
159 | * | |
160 | * If the modules are required, we will return with error after the | |
161 | * first failed module load, otherwise we continue loading. | |
162 | * | |
163 | * @returns \c 0 on success | |
164 | * \c < 0 on error | |
165 | */ | |
866c17ce MJ |
166 | static int modprobe_lttng(struct kern_modules_param *modules, |
167 | int entries, int required) | |
168 | { | |
169 | int ret = 0, i; | |
170 | struct kmod_ctx *ctx; | |
171 | ||
172 | ret = setup_kmod_ctx(&ctx); | |
173 | if (ret < 0) { | |
174 | goto error; | |
175 | } | |
234170ac UTL |
176 | |
177 | for (i = 0; i < entries; i++) { | |
178 | struct kmod_module *mod = NULL; | |
179 | ||
180 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
181 | if (ret < 0) { | |
182 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
183 | goto error; | |
184 | } | |
185 | ||
0b1e16b8 | 186 | ret = kmod_module_probe_insert_module(mod, 0, |
234170ac | 187 | NULL, NULL, NULL, NULL); |
0b1e16b8 MJ |
188 | if (ret == -EEXIST) { |
189 | DBG("Module %s is already loaded", modules[i].name); | |
190 | ret = 0; | |
191 | } else if (ret < 0) { | |
16c2e854 PP |
192 | if (required) { |
193 | ERR("Unable to load required module %s", | |
194 | modules[i].name); | |
195 | goto error; | |
196 | } else { | |
197 | DBG("Unable to load optional module %s; continuing", | |
198 | modules[i].name); | |
199 | ret = 0; | |
200 | } | |
234170ac UTL |
201 | } else { |
202 | DBG("Modprobe successfully %s", modules[i].name); | |
4ad664a0 | 203 | modules[i].loaded = true; |
234170ac UTL |
204 | } |
205 | ||
206 | kmod_module_unref(mod); | |
207 | } | |
208 | ||
209 | error: | |
210 | if (ctx) { | |
211 | kmod_unref(ctx); | |
212 | } | |
213 | return ret; | |
214 | } | |
215 | ||
d11b2027 MJ |
216 | /** |
217 | * @brief Recursively unload modules. | |
218 | * | |
219 | * This function implements the same modules unloading behavior as | |
220 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
221 | * dependencies and unload modules with a refcount of 0. | |
222 | * | |
223 | * @param mod The module to unload | |
224 | * | |
225 | * @returns \c 0 on success | |
226 | * \c < 0 on error | |
227 | */ | |
866c17ce MJ |
228 | static int rmmod_recurse(struct kmod_module *mod) { |
229 | int ret = 0; | |
230 | struct kmod_list *deps, *itr; | |
231 | ||
232 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
233 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
234 | return ret; | |
235 | } | |
236 | ||
237 | ret = kmod_module_remove_module(mod, 0); | |
238 | ||
239 | deps = kmod_module_get_dependencies(mod); | |
240 | if (deps != NULL) { | |
241 | kmod_list_foreach(itr, deps) { | |
242 | struct kmod_module *dep = kmod_module_get_module(itr); | |
243 | if (kmod_module_get_refcnt(dep) == 0) { | |
244 | DBG("Recursive remove module %s", | |
245 | kmod_module_get_name(dep)); | |
246 | rmmod_recurse(dep); | |
247 | } | |
248 | kmod_module_unref(dep); | |
249 | } | |
250 | kmod_module_unref_list(deps); | |
251 | } | |
252 | ||
253 | return ret; | |
254 | } | |
255 | ||
d11b2027 MJ |
256 | /** |
257 | * @brief Unloads the kernel modules in \p modules | |
258 | * | |
259 | * @param modules List of modules to unload | |
260 | * @param entries Number of modules in the list | |
261 | * @param required Are the modules required or optionnal | |
262 | * | |
263 | */ | |
866c17ce MJ |
264 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
265 | int entries, int required) | |
266 | { | |
267 | int ret = 0, i; | |
268 | struct kmod_ctx *ctx; | |
269 | ||
270 | ret = setup_kmod_ctx(&ctx); | |
271 | if (ret < 0) { | |
272 | goto error; | |
273 | } | |
274 | ||
275 | for (i = entries - 1; i >= 0; i--) { | |
276 | struct kmod_module *mod = NULL; | |
277 | ||
4ad664a0 JG |
278 | if (!modules[i].loaded) { |
279 | continue; | |
280 | } | |
281 | ||
866c17ce MJ |
282 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
283 | if (ret < 0) { | |
284 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
285 | goto error; | |
286 | } | |
287 | ||
288 | ret = rmmod_recurse(mod); | |
289 | if (ret == -EEXIST) { | |
290 | DBG("Module %s is not in kernel.", modules[i].name); | |
291 | } else if (required && ret < 0) { | |
292 | ERR("Unable to remove module %s", modules[i].name); | |
293 | } else { | |
294 | DBG("Modprobe removal successful %s", | |
295 | modules[i].name); | |
296 | } | |
297 | ||
298 | kmod_module_unref(mod); | |
299 | } | |
300 | ||
301 | error: | |
302 | if (ctx) { | |
303 | kmod_unref(ctx); | |
304 | } | |
305 | } | |
306 | ||
234170ac UTL |
307 | #else /* HAVE_KMOD */ |
308 | ||
fbb9748b | 309 | static int modprobe_lttng(struct kern_modules_param *modules, |
234170ac | 310 | int entries, int required) |
096102bd DG |
311 | { |
312 | int ret = 0, i; | |
313 | char modprobe[256]; | |
314 | ||
e23b81ed | 315 | for (i = 0; i < entries; i++) { |
096102bd DG |
316 | ret = snprintf(modprobe, sizeof(modprobe), |
317 | "/sbin/modprobe %s%s", | |
ab57d7d3 | 318 | required ? "" : "-q ", |
e23b81ed | 319 | modules[i].name); |
096102bd DG |
320 | if (ret < 0) { |
321 | PERROR("snprintf modprobe"); | |
322 | goto error; | |
323 | } | |
324 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
325 | ret = system(modprobe); | |
326 | if (ret == -1) { | |
16c2e854 PP |
327 | if (required) { |
328 | ERR("Unable to launch modprobe for required module %s", | |
329 | modules[i].name); | |
330 | goto error; | |
331 | } else { | |
332 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
333 | modules[i].name); | |
334 | ret = 0; | |
335 | } | |
336 | } else if (WEXITSTATUS(ret) != 0) { | |
337 | if (required) { | |
338 | ERR("Unable to load required module %s", | |
339 | modules[i].name); | |
340 | goto error; | |
341 | } else { | |
342 | DBG("Unable to load optional module %s; continuing", | |
343 | modules[i].name); | |
344 | ret = 0; | |
345 | } | |
096102bd | 346 | } else { |
ab57d7d3 | 347 | DBG("Modprobe successfully %s", modules[i].name); |
355d2778 | 348 | modules[i].loaded = true; |
096102bd DG |
349 | } |
350 | } | |
351 | ||
352 | error: | |
353 | return ret; | |
354 | } | |
355 | ||
35e090b7 MJ |
356 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
357 | int entries, int required) | |
358 | { | |
359 | int ret = 0, i; | |
360 | char modprobe[256]; | |
361 | ||
362 | for (i = entries - 1; i >= 0; i--) { | |
4ad664a0 JG |
363 | if (!modules[i].loaded) { |
364 | continue; | |
365 | } | |
35e090b7 MJ |
366 | ret = snprintf(modprobe, sizeof(modprobe), |
367 | "/sbin/modprobe -r -q %s", | |
368 | modules[i].name); | |
369 | if (ret < 0) { | |
370 | PERROR("snprintf modprobe -r"); | |
371 | return; | |
372 | } | |
373 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
374 | ret = system(modprobe); | |
375 | if (ret == -1) { | |
376 | ERR("Unable to launch modprobe -r for module %s", | |
377 | modules[i].name); | |
378 | } else if (required && WEXITSTATUS(ret) != 0) { | |
379 | ERR("Unable to remove module %s", | |
380 | modules[i].name); | |
381 | } else { | |
382 | DBG("Modprobe removal successful %s", | |
383 | modules[i].name); | |
384 | } | |
385 | } | |
386 | } | |
387 | ||
866c17ce MJ |
388 | #endif /* HAVE_KMOD */ |
389 | ||
35e090b7 MJ |
390 | /* |
391 | * Remove control kernel module(s) in reverse load order. | |
392 | */ | |
393 | void modprobe_remove_lttng_control(void) | |
394 | { | |
395 | modprobe_remove_lttng(kern_modules_control_core, | |
396 | ARRAY_SIZE(kern_modules_control_core), | |
397 | LTTNG_MOD_REQUIRED); | |
398 | } | |
399 | ||
400 | static void free_probes(void) | |
401 | { | |
402 | int i; | |
403 | ||
404 | if (!probes) { | |
405 | return; | |
406 | } | |
407 | for (i = 0; i < nr_probes; ++i) { | |
408 | free(probes[i].name); | |
409 | } | |
410 | free(probes); | |
411 | probes = NULL; | |
412 | nr_probes = 0; | |
413 | } | |
414 | ||
415 | /* | |
416 | * Remove data kernel modules in reverse load order. | |
417 | */ | |
418 | void modprobe_remove_lttng_data(void) | |
419 | { | |
420 | if (!probes) { | |
421 | return; | |
422 | } | |
423 | modprobe_remove_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); | |
424 | free_probes(); | |
425 | } | |
426 | ||
427 | /* | |
428 | * Remove all kernel modules in reverse order. | |
429 | */ | |
430 | void modprobe_remove_lttng_all(void) | |
431 | { | |
432 | modprobe_remove_lttng_data(); | |
433 | modprobe_remove_lttng_control(); | |
434 | } | |
435 | ||
e23b81ed JG |
436 | /* |
437 | * Load control kernel module(s). | |
438 | */ | |
439 | int modprobe_lttng_control(void) | |
440 | { | |
ab57d7d3 JG |
441 | int ret; |
442 | ||
443 | ret = modprobe_lttng(kern_modules_control_core, | |
444 | ARRAY_SIZE(kern_modules_control_core), | |
445 | LTTNG_MOD_REQUIRED); | |
ab57d7d3 | 446 | return ret; |
e23b81ed | 447 | } |
ab57d7d3 | 448 | |
c9d42407 PP |
449 | /** |
450 | * Grow global list of probes (double capacity or set it to 1 if | |
451 | * currently 0 and copy existing data). | |
096102bd | 452 | */ |
c9d42407 | 453 | static int grow_probes(void) |
096102bd | 454 | { |
c9d42407 PP |
455 | int i; |
456 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 457 | |
c9d42407 PP |
458 | /* Initialize capacity to 1 if 0. */ |
459 | if (probes_capacity == 0) { | |
460 | probes = zmalloc(sizeof(*probes)); | |
461 | if (!probes) { | |
462 | PERROR("malloc probe list"); | |
463 | return -ENOMEM; | |
464 | } | |
465 | ||
466 | probes_capacity = 1; | |
467 | return 0; | |
fbb9748b JG |
468 | } |
469 | ||
c9d42407 PP |
470 | /* Double size. */ |
471 | probes_capacity *= 2; | |
472 | ||
473 | tmp_probes = zmalloc(sizeof(*tmp_probes) * probes_capacity); | |
474 | if (!tmp_probes) { | |
fbb9748b JG |
475 | PERROR("malloc probe list"); |
476 | return -ENOMEM; | |
477 | } | |
478 | ||
c9d42407 PP |
479 | for (i = 0; i < nr_probes; ++i) { |
480 | /* Move name pointer. */ | |
481 | tmp_probes[i].name = probes[i].name; | |
482 | } | |
483 | ||
484 | /* Replace probes with larger copy. */ | |
485 | free(probes); | |
486 | probes = tmp_probes; | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | /* | |
492 | * Appends a comma-separated list of probes to the global list | |
493 | * of probes. | |
494 | */ | |
495 | static int append_list_to_probes(const char *list) | |
496 | { | |
497 | char *next; | |
d3c04b7c | 498 | int ret; |
44603c80 | 499 | char *tmp_list, *cur_list; |
c9d42407 PP |
500 | |
501 | assert(list); | |
502 | ||
44603c80 | 503 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
504 | if (!tmp_list) { |
505 | PERROR("strdup temp list"); | |
506 | return -ENOMEM; | |
507 | } | |
508 | ||
509 | for (;;) { | |
fbb9748b | 510 | size_t name_len; |
c9d42407 | 511 | struct kern_modules_param *cur_mod; |
fbb9748b | 512 | |
44603c80 | 513 | next = strtok(cur_list, ","); |
fbb9748b | 514 | if (!next) { |
c9d42407 | 515 | break; |
fbb9748b | 516 | } |
44603c80 | 517 | cur_list = NULL; |
fbb9748b JG |
518 | |
519 | /* filter leading spaces */ | |
520 | while (*next == ' ') { | |
521 | next++; | |
522 | } | |
523 | ||
c9d42407 PP |
524 | if (probes_capacity <= nr_probes) { |
525 | ret = grow_probes(); | |
526 | if (ret) { | |
398d5459 | 527 | goto error; |
c9d42407 PP |
528 | } |
529 | } | |
530 | ||
fbb9748b JG |
531 | /* Length 13 is "lttng-probe-" + \0 */ |
532 | name_len = strlen(next) + 13; | |
533 | ||
d3c04b7c | 534 | cur_mod = &probes[nr_probes]; |
c9d42407 PP |
535 | cur_mod->name = zmalloc(name_len); |
536 | if (!cur_mod->name) { | |
fbb9748b | 537 | PERROR("malloc probe list"); |
398d5459 MD |
538 | ret = -ENOMEM; |
539 | goto error; | |
fbb9748b JG |
540 | } |
541 | ||
c9d42407 | 542 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
543 | if (ret < 0) { |
544 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
545 | ret = -ENOMEM; |
546 | goto error; | |
fbb9748b | 547 | } |
c9d42407 | 548 | |
c9d42407 | 549 | nr_probes++; |
fbb9748b JG |
550 | } |
551 | ||
c9d42407 | 552 | free(tmp_list); |
c9d42407 | 553 | return 0; |
398d5459 MD |
554 | |
555 | error: | |
556 | free(tmp_list); | |
557 | free_probes(); | |
558 | return ret; | |
c9d42407 PP |
559 | } |
560 | ||
561 | /* | |
562 | * Load data kernel module(s). | |
563 | */ | |
564 | int modprobe_lttng_data(void) | |
565 | { | |
566 | int ret, i; | |
567 | char *list; | |
568 | ||
569 | /* | |
570 | * Base probes: either from command line option, environment | |
571 | * variable or default list. | |
572 | */ | |
e6142f2e | 573 | list = config.kmod_probes_list.value; |
c9d42407 PP |
574 | if (list) { |
575 | /* User-specified probes. */ | |
576 | ret = append_list_to_probes(list); | |
c9d42407 PP |
577 | if (ret) { |
578 | return ret; | |
579 | } | |
580 | } else { | |
581 | /* Default probes. */ | |
582 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 583 | |
62e0422e | 584 | probes = zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
585 | if (!probes) { |
586 | PERROR("malloc probe list"); | |
587 | return -ENOMEM; | |
588 | } | |
589 | ||
590 | nr_probes = probes_capacity = def_len; | |
591 | ||
592 | for (i = 0; i < def_len; ++i) { | |
593 | char* name = strdup(kern_modules_probes_default[i].name); | |
594 | ||
595 | if (!name) { | |
596 | PERROR("strdup probe item"); | |
398d5459 MD |
597 | ret = -ENOMEM; |
598 | goto error; | |
c9d42407 PP |
599 | } |
600 | ||
601 | probes[i].name = name; | |
602 | } | |
603 | } | |
604 | ||
605 | /* | |
606 | * Extra modules? Append them to current probes list. | |
607 | */ | |
e6142f2e | 608 | list = config.kmod_extra_probes_list.value; |
c9d42407 PP |
609 | if (list) { |
610 | ret = append_list_to_probes(list); | |
611 | if (ret) { | |
398d5459 | 612 | goto error; |
c9d42407 PP |
613 | } |
614 | } | |
615 | ||
616 | /* | |
617 | * Load probes modules now. | |
618 | */ | |
398d5459 MD |
619 | ret = modprobe_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); |
620 | if (ret) { | |
621 | goto error; | |
622 | } | |
623 | return ret; | |
624 | ||
625 | error: | |
626 | free_probes(); | |
627 | return ret; | |
096102bd | 628 | } |