Commit | Line | Data |
---|---|---|
096102bd | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <dgoulet@efficios.com> |
3 | * Copyright (C) 2014 Jan Glauber <jan.glauber@gmail.com> | |
096102bd | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
096102bd | 6 | * |
096102bd DG |
7 | */ |
8 | ||
d11b2027 MJ |
9 | /** |
10 | * @file modprobe.c | |
11 | * | |
12 | * @brief modprobe related functions. | |
13 | * | |
14 | */ | |
15 | ||
6c1c0768 | 16 | #define _LGPL_SOURCE |
c9d42407 | 17 | #include <assert.h> |
096102bd DG |
18 | #include <stdio.h> |
19 | #include <stdlib.h> | |
20 | #include <sys/wait.h> | |
21 | ||
22 | #include <common/common.h> | |
fbb9748b | 23 | #include <common/utils.h> |
096102bd DG |
24 | |
25 | #include "modprobe.h" | |
26 | #include "kern-modules.h" | |
e6142f2e | 27 | #include "lttng-sessiond.h" |
096102bd | 28 | |
ab57d7d3 JG |
29 | #define LTTNG_MOD_REQUIRED 1 |
30 | #define LTTNG_MOD_OPTIONAL 0 | |
31 | ||
32 | /* LTTng kernel tracer mandatory core modules list */ | |
d3a684ee JR |
33 | /* TODO: the new trigger client might not be present in previous lttng-modules |
34 | * should it be optional? | |
35 | * Can we reuse this to also know of the trigger feature is supported? | |
36 | */ | |
ab57d7d3 | 37 | struct kern_modules_param kern_modules_control_core[] = { |
d3a684ee JR |
38 | { (char *) "lttng-ring-buffer-client-discard" }, |
39 | { (char *) "lttng-ring-buffer-client-overwrite" }, | |
40 | { (char *) "lttng-ring-buffer-metadata-client" }, | |
41 | { (char *) "lttng-ring-buffer-client-mmap-discard" }, | |
42 | { (char *) "lttng-ring-buffer-client-mmap-overwrite" }, | |
43 | { (char *) "lttng-ring-buffer-metadata-mmap-client" }, | |
44 | { (char *) "lttng-ring-buffer-trigger-client" }, | |
ab57d7d3 JG |
45 | }; |
46 | ||
3fa9646c | 47 | /* LTTng kernel tracer probe modules list */ |
fbb9748b | 48 | struct kern_modules_param kern_modules_probes_default[] = { |
d3a684ee JR |
49 | { (char *) "lttng-probe-asoc" }, |
50 | { (char *) "lttng-probe-block" }, | |
51 | { (char *) "lttng-probe-btrfs" }, | |
52 | { (char *) "lttng-probe-compaction" }, | |
53 | { (char *) "lttng-probe-ext3" }, | |
54 | { (char *) "lttng-probe-ext4" }, | |
55 | { (char *) "lttng-probe-gpio" }, | |
56 | { (char *) "lttng-probe-i2c" }, | |
57 | { (char *) "lttng-probe-irq" }, | |
58 | { (char *) "lttng-probe-jbd" }, | |
59 | { (char *) "lttng-probe-jbd2" }, | |
60 | { (char *) "lttng-probe-kmem" }, | |
61 | { (char *) "lttng-probe-kvm" }, | |
62 | { (char *) "lttng-probe-kvm-x86" }, | |
63 | { (char *) "lttng-probe-kvm-x86-mmu" }, | |
64 | { (char *) "lttng-probe-lock" }, | |
65 | { (char *) "lttng-probe-module" }, | |
66 | { (char *) "lttng-probe-napi" }, | |
67 | { (char *) "lttng-probe-net" }, | |
68 | { (char *) "lttng-probe-power" }, | |
69 | { (char *) "lttng-probe-preemptirq" }, | |
70 | { (char *) "lttng-probe-printk" }, | |
71 | { (char *) "lttng-probe-random" }, | |
72 | { (char *) "lttng-probe-rcu" }, | |
73 | { (char *) "lttng-probe-regmap" }, | |
74 | { (char *) "lttng-probe-regulator" }, | |
75 | { (char *) "lttng-probe-rpm" }, | |
76 | { (char *) "lttng-probe-sched" }, | |
77 | { (char *) "lttng-probe-scsi" }, | |
78 | { (char *) "lttng-probe-signal" }, | |
79 | { (char *) "lttng-probe-skb" }, | |
80 | { (char *) "lttng-probe-sock" }, | |
81 | { (char *) "lttng-probe-statedump" }, | |
82 | { (char *) "lttng-probe-sunrpc" }, | |
83 | { (char *) "lttng-probe-timer" }, | |
84 | { (char *) "lttng-probe-udp" }, | |
85 | { (char *) "lttng-probe-vmscan" }, | |
86 | { (char *) "lttng-probe-v4l2" }, | |
87 | { (char *) "lttng-probe-workqueue" }, | |
88 | { (char *) "lttng-probe-writeback" }, | |
89 | { (char *) "lttng-probe-x86-irq-vectors" }, | |
90 | { (char *) "lttng-probe-x86-exceptions" }, | |
096102bd DG |
91 | }; |
92 | ||
fbb9748b JG |
93 | /* dynamic probe modules list */ |
94 | static struct kern_modules_param *probes; | |
95 | static int nr_probes; | |
c9d42407 | 96 | static int probes_capacity; |
fbb9748b | 97 | |
234170ac UTL |
98 | #if HAVE_KMOD |
99 | #include <libkmod.h> | |
866c17ce | 100 | |
d11b2027 MJ |
101 | /** |
102 | * @brief Logging function for libkmod integration. | |
103 | */ | |
234170ac UTL |
104 | static void log_kmod(void *data, int priority, const char *file, int line, |
105 | const char *fn, const char *format, va_list args) | |
106 | { | |
107 | char *str; | |
108 | ||
109 | if (vasprintf(&str, format, args) < 0) { | |
110 | return; | |
111 | } | |
112 | ||
113 | DBG("libkmod: %s", str); | |
114 | free(str); | |
115 | } | |
866c17ce | 116 | |
d11b2027 MJ |
117 | /** |
118 | * @brief Setup the libkmod context. | |
119 | * | |
120 | * Create the context, add a custom logging function and preload the | |
121 | * ressources for faster operation. | |
122 | * | |
123 | * @returns \c 0 on success | |
124 | * \c < 0 on error | |
125 | */ | |
866c17ce | 126 | static int setup_kmod_ctx(struct kmod_ctx **ctx) |
234170ac | 127 | { |
866c17ce | 128 | int ret = 0; |
234170ac | 129 | |
866c17ce | 130 | *ctx = kmod_new(NULL, NULL); |
234170ac UTL |
131 | if (!ctx) { |
132 | PERROR("Unable to create kmod library context"); | |
133 | ret = -ENOMEM; | |
134 | goto error; | |
135 | } | |
136 | ||
866c17ce MJ |
137 | kmod_set_log_fn(*ctx, log_kmod, NULL); |
138 | ret = kmod_load_resources(*ctx); | |
139 | if (ret < 0) { | |
140 | ERR("Failed to load kmod library resources"); | |
141 | goto error; | |
142 | } | |
143 | ||
144 | error: | |
145 | return ret; | |
146 | } | |
147 | ||
d11b2027 MJ |
148 | /** |
149 | * @brief Loads the kernel modules in \p modules | |
150 | * | |
151 | * @param modules List of modules to load | |
152 | * @param entries Number of modules in the list | |
153 | * @param required Are the modules required or optionnal | |
154 | * | |
155 | * If the modules are required, we will return with error after the | |
156 | * first failed module load, otherwise we continue loading. | |
157 | * | |
158 | * @returns \c 0 on success | |
159 | * \c < 0 on error | |
160 | */ | |
866c17ce MJ |
161 | static int modprobe_lttng(struct kern_modules_param *modules, |
162 | int entries, int required) | |
163 | { | |
164 | int ret = 0, i; | |
165 | struct kmod_ctx *ctx; | |
166 | ||
167 | ret = setup_kmod_ctx(&ctx); | |
168 | if (ret < 0) { | |
169 | goto error; | |
170 | } | |
234170ac UTL |
171 | |
172 | for (i = 0; i < entries; i++) { | |
173 | struct kmod_module *mod = NULL; | |
174 | ||
175 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
176 | if (ret < 0) { | |
177 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
178 | goto error; | |
179 | } | |
180 | ||
0b1e16b8 | 181 | ret = kmod_module_probe_insert_module(mod, 0, |
234170ac | 182 | NULL, NULL, NULL, NULL); |
0b1e16b8 MJ |
183 | if (ret == -EEXIST) { |
184 | DBG("Module %s is already loaded", modules[i].name); | |
185 | ret = 0; | |
186 | } else if (ret < 0) { | |
16c2e854 PP |
187 | if (required) { |
188 | ERR("Unable to load required module %s", | |
189 | modules[i].name); | |
190 | goto error; | |
191 | } else { | |
192 | DBG("Unable to load optional module %s; continuing", | |
193 | modules[i].name); | |
194 | ret = 0; | |
195 | } | |
234170ac UTL |
196 | } else { |
197 | DBG("Modprobe successfully %s", modules[i].name); | |
4ad664a0 | 198 | modules[i].loaded = true; |
234170ac UTL |
199 | } |
200 | ||
201 | kmod_module_unref(mod); | |
202 | } | |
203 | ||
204 | error: | |
205 | if (ctx) { | |
206 | kmod_unref(ctx); | |
207 | } | |
208 | return ret; | |
209 | } | |
210 | ||
d11b2027 MJ |
211 | /** |
212 | * @brief Recursively unload modules. | |
213 | * | |
214 | * This function implements the same modules unloading behavior as | |
215 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
216 | * dependencies and unload modules with a refcount of 0. | |
217 | * | |
218 | * @param mod The module to unload | |
219 | * | |
220 | * @returns \c 0 on success | |
221 | * \c < 0 on error | |
222 | */ | |
866c17ce MJ |
223 | static int rmmod_recurse(struct kmod_module *mod) { |
224 | int ret = 0; | |
225 | struct kmod_list *deps, *itr; | |
226 | ||
227 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
228 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
229 | return ret; | |
230 | } | |
231 | ||
232 | ret = kmod_module_remove_module(mod, 0); | |
233 | ||
234 | deps = kmod_module_get_dependencies(mod); | |
235 | if (deps != NULL) { | |
236 | kmod_list_foreach(itr, deps) { | |
237 | struct kmod_module *dep = kmod_module_get_module(itr); | |
238 | if (kmod_module_get_refcnt(dep) == 0) { | |
239 | DBG("Recursive remove module %s", | |
240 | kmod_module_get_name(dep)); | |
241 | rmmod_recurse(dep); | |
242 | } | |
243 | kmod_module_unref(dep); | |
244 | } | |
245 | kmod_module_unref_list(deps); | |
246 | } | |
247 | ||
248 | return ret; | |
249 | } | |
250 | ||
d11b2027 MJ |
251 | /** |
252 | * @brief Unloads the kernel modules in \p modules | |
253 | * | |
254 | * @param modules List of modules to unload | |
255 | * @param entries Number of modules in the list | |
256 | * @param required Are the modules required or optionnal | |
257 | * | |
258 | */ | |
866c17ce MJ |
259 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
260 | int entries, int required) | |
261 | { | |
262 | int ret = 0, i; | |
263 | struct kmod_ctx *ctx; | |
264 | ||
265 | ret = setup_kmod_ctx(&ctx); | |
266 | if (ret < 0) { | |
267 | goto error; | |
268 | } | |
269 | ||
270 | for (i = entries - 1; i >= 0; i--) { | |
271 | struct kmod_module *mod = NULL; | |
272 | ||
4ad664a0 JG |
273 | if (!modules[i].loaded) { |
274 | continue; | |
275 | } | |
276 | ||
866c17ce MJ |
277 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
278 | if (ret < 0) { | |
279 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
280 | goto error; | |
281 | } | |
282 | ||
283 | ret = rmmod_recurse(mod); | |
284 | if (ret == -EEXIST) { | |
285 | DBG("Module %s is not in kernel.", modules[i].name); | |
286 | } else if (required && ret < 0) { | |
287 | ERR("Unable to remove module %s", modules[i].name); | |
288 | } else { | |
289 | DBG("Modprobe removal successful %s", | |
290 | modules[i].name); | |
291 | } | |
292 | ||
293 | kmod_module_unref(mod); | |
294 | } | |
295 | ||
296 | error: | |
297 | if (ctx) { | |
298 | kmod_unref(ctx); | |
299 | } | |
300 | } | |
301 | ||
234170ac UTL |
302 | #else /* HAVE_KMOD */ |
303 | ||
fbb9748b | 304 | static int modprobe_lttng(struct kern_modules_param *modules, |
234170ac | 305 | int entries, int required) |
096102bd DG |
306 | { |
307 | int ret = 0, i; | |
308 | char modprobe[256]; | |
309 | ||
e23b81ed | 310 | for (i = 0; i < entries; i++) { |
096102bd DG |
311 | ret = snprintf(modprobe, sizeof(modprobe), |
312 | "/sbin/modprobe %s%s", | |
ab57d7d3 | 313 | required ? "" : "-q ", |
e23b81ed | 314 | modules[i].name); |
096102bd DG |
315 | if (ret < 0) { |
316 | PERROR("snprintf modprobe"); | |
317 | goto error; | |
318 | } | |
319 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
320 | ret = system(modprobe); | |
321 | if (ret == -1) { | |
16c2e854 PP |
322 | if (required) { |
323 | ERR("Unable to launch modprobe for required module %s", | |
324 | modules[i].name); | |
325 | goto error; | |
326 | } else { | |
327 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
328 | modules[i].name); | |
329 | ret = 0; | |
330 | } | |
331 | } else if (WEXITSTATUS(ret) != 0) { | |
332 | if (required) { | |
333 | ERR("Unable to load required module %s", | |
334 | modules[i].name); | |
335 | goto error; | |
336 | } else { | |
337 | DBG("Unable to load optional module %s; continuing", | |
338 | modules[i].name); | |
339 | ret = 0; | |
340 | } | |
096102bd | 341 | } else { |
ab57d7d3 | 342 | DBG("Modprobe successfully %s", modules[i].name); |
355d2778 | 343 | modules[i].loaded = true; |
096102bd DG |
344 | } |
345 | } | |
346 | ||
347 | error: | |
348 | return ret; | |
349 | } | |
350 | ||
35e090b7 MJ |
351 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
352 | int entries, int required) | |
353 | { | |
354 | int ret = 0, i; | |
355 | char modprobe[256]; | |
356 | ||
357 | for (i = entries - 1; i >= 0; i--) { | |
4ad664a0 JG |
358 | if (!modules[i].loaded) { |
359 | continue; | |
360 | } | |
35e090b7 MJ |
361 | ret = snprintf(modprobe, sizeof(modprobe), |
362 | "/sbin/modprobe -r -q %s", | |
363 | modules[i].name); | |
364 | if (ret < 0) { | |
365 | PERROR("snprintf modprobe -r"); | |
366 | return; | |
367 | } | |
368 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
369 | ret = system(modprobe); | |
370 | if (ret == -1) { | |
371 | ERR("Unable to launch modprobe -r for module %s", | |
372 | modules[i].name); | |
373 | } else if (required && WEXITSTATUS(ret) != 0) { | |
374 | ERR("Unable to remove module %s", | |
375 | modules[i].name); | |
376 | } else { | |
377 | DBG("Modprobe removal successful %s", | |
378 | modules[i].name); | |
379 | } | |
380 | } | |
381 | } | |
382 | ||
866c17ce MJ |
383 | #endif /* HAVE_KMOD */ |
384 | ||
35e090b7 MJ |
385 | /* |
386 | * Remove control kernel module(s) in reverse load order. | |
387 | */ | |
388 | void modprobe_remove_lttng_control(void) | |
389 | { | |
390 | modprobe_remove_lttng(kern_modules_control_core, | |
391 | ARRAY_SIZE(kern_modules_control_core), | |
392 | LTTNG_MOD_REQUIRED); | |
393 | } | |
394 | ||
395 | static void free_probes(void) | |
396 | { | |
397 | int i; | |
398 | ||
399 | if (!probes) { | |
400 | return; | |
401 | } | |
402 | for (i = 0; i < nr_probes; ++i) { | |
403 | free(probes[i].name); | |
404 | } | |
405 | free(probes); | |
406 | probes = NULL; | |
407 | nr_probes = 0; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Remove data kernel modules in reverse load order. | |
412 | */ | |
413 | void modprobe_remove_lttng_data(void) | |
414 | { | |
415 | if (!probes) { | |
416 | return; | |
417 | } | |
418 | modprobe_remove_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); | |
419 | free_probes(); | |
420 | } | |
421 | ||
422 | /* | |
423 | * Remove all kernel modules in reverse order. | |
424 | */ | |
425 | void modprobe_remove_lttng_all(void) | |
426 | { | |
427 | modprobe_remove_lttng_data(); | |
428 | modprobe_remove_lttng_control(); | |
429 | } | |
430 | ||
e23b81ed JG |
431 | /* |
432 | * Load control kernel module(s). | |
433 | */ | |
434 | int modprobe_lttng_control(void) | |
435 | { | |
ab57d7d3 JG |
436 | int ret; |
437 | ||
438 | ret = modprobe_lttng(kern_modules_control_core, | |
439 | ARRAY_SIZE(kern_modules_control_core), | |
440 | LTTNG_MOD_REQUIRED); | |
ab57d7d3 | 441 | return ret; |
e23b81ed | 442 | } |
ab57d7d3 | 443 | |
c9d42407 PP |
444 | /** |
445 | * Grow global list of probes (double capacity or set it to 1 if | |
446 | * currently 0 and copy existing data). | |
096102bd | 447 | */ |
c9d42407 | 448 | static int grow_probes(void) |
096102bd | 449 | { |
c9d42407 PP |
450 | int i; |
451 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 452 | |
c9d42407 PP |
453 | /* Initialize capacity to 1 if 0. */ |
454 | if (probes_capacity == 0) { | |
455 | probes = zmalloc(sizeof(*probes)); | |
456 | if (!probes) { | |
457 | PERROR("malloc probe list"); | |
458 | return -ENOMEM; | |
459 | } | |
460 | ||
461 | probes_capacity = 1; | |
462 | return 0; | |
fbb9748b JG |
463 | } |
464 | ||
c9d42407 PP |
465 | /* Double size. */ |
466 | probes_capacity *= 2; | |
467 | ||
468 | tmp_probes = zmalloc(sizeof(*tmp_probes) * probes_capacity); | |
469 | if (!tmp_probes) { | |
fbb9748b JG |
470 | PERROR("malloc probe list"); |
471 | return -ENOMEM; | |
472 | } | |
473 | ||
c9d42407 PP |
474 | for (i = 0; i < nr_probes; ++i) { |
475 | /* Move name pointer. */ | |
476 | tmp_probes[i].name = probes[i].name; | |
477 | } | |
478 | ||
479 | /* Replace probes with larger copy. */ | |
480 | free(probes); | |
481 | probes = tmp_probes; | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Appends a comma-separated list of probes to the global list | |
488 | * of probes. | |
489 | */ | |
490 | static int append_list_to_probes(const char *list) | |
491 | { | |
492 | char *next; | |
d3c04b7c | 493 | int ret; |
44603c80 | 494 | char *tmp_list, *cur_list; |
c9d42407 PP |
495 | |
496 | assert(list); | |
497 | ||
44603c80 | 498 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
499 | if (!tmp_list) { |
500 | PERROR("strdup temp list"); | |
501 | return -ENOMEM; | |
502 | } | |
503 | ||
504 | for (;;) { | |
fbb9748b | 505 | size_t name_len; |
c9d42407 | 506 | struct kern_modules_param *cur_mod; |
fbb9748b | 507 | |
44603c80 | 508 | next = strtok(cur_list, ","); |
fbb9748b | 509 | if (!next) { |
c9d42407 | 510 | break; |
fbb9748b | 511 | } |
44603c80 | 512 | cur_list = NULL; |
fbb9748b JG |
513 | |
514 | /* filter leading spaces */ | |
515 | while (*next == ' ') { | |
516 | next++; | |
517 | } | |
518 | ||
c9d42407 PP |
519 | if (probes_capacity <= nr_probes) { |
520 | ret = grow_probes(); | |
521 | if (ret) { | |
398d5459 | 522 | goto error; |
c9d42407 PP |
523 | } |
524 | } | |
525 | ||
fbb9748b JG |
526 | /* Length 13 is "lttng-probe-" + \0 */ |
527 | name_len = strlen(next) + 13; | |
528 | ||
d3c04b7c | 529 | cur_mod = &probes[nr_probes]; |
c9d42407 PP |
530 | cur_mod->name = zmalloc(name_len); |
531 | if (!cur_mod->name) { | |
fbb9748b | 532 | PERROR("malloc probe list"); |
398d5459 MD |
533 | ret = -ENOMEM; |
534 | goto error; | |
fbb9748b JG |
535 | } |
536 | ||
c9d42407 | 537 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
538 | if (ret < 0) { |
539 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
540 | ret = -ENOMEM; |
541 | goto error; | |
fbb9748b | 542 | } |
c9d42407 | 543 | |
c9d42407 | 544 | nr_probes++; |
fbb9748b JG |
545 | } |
546 | ||
c9d42407 | 547 | free(tmp_list); |
c9d42407 | 548 | return 0; |
398d5459 MD |
549 | |
550 | error: | |
551 | free(tmp_list); | |
552 | free_probes(); | |
553 | return ret; | |
c9d42407 PP |
554 | } |
555 | ||
556 | /* | |
557 | * Load data kernel module(s). | |
558 | */ | |
559 | int modprobe_lttng_data(void) | |
560 | { | |
561 | int ret, i; | |
562 | char *list; | |
563 | ||
564 | /* | |
565 | * Base probes: either from command line option, environment | |
566 | * variable or default list. | |
567 | */ | |
e6142f2e | 568 | list = config.kmod_probes_list.value; |
c9d42407 PP |
569 | if (list) { |
570 | /* User-specified probes. */ | |
571 | ret = append_list_to_probes(list); | |
c9d42407 PP |
572 | if (ret) { |
573 | return ret; | |
574 | } | |
575 | } else { | |
576 | /* Default probes. */ | |
577 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 578 | |
62e0422e | 579 | probes = zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
580 | if (!probes) { |
581 | PERROR("malloc probe list"); | |
582 | return -ENOMEM; | |
583 | } | |
584 | ||
585 | nr_probes = probes_capacity = def_len; | |
586 | ||
587 | for (i = 0; i < def_len; ++i) { | |
588 | char* name = strdup(kern_modules_probes_default[i].name); | |
589 | ||
590 | if (!name) { | |
591 | PERROR("strdup probe item"); | |
398d5459 MD |
592 | ret = -ENOMEM; |
593 | goto error; | |
c9d42407 PP |
594 | } |
595 | ||
596 | probes[i].name = name; | |
597 | } | |
598 | } | |
599 | ||
600 | /* | |
601 | * Extra modules? Append them to current probes list. | |
602 | */ | |
e6142f2e | 603 | list = config.kmod_extra_probes_list.value; |
c9d42407 PP |
604 | if (list) { |
605 | ret = append_list_to_probes(list); | |
606 | if (ret) { | |
398d5459 | 607 | goto error; |
c9d42407 PP |
608 | } |
609 | } | |
610 | ||
611 | /* | |
612 | * Load probes modules now. | |
613 | */ | |
398d5459 MD |
614 | ret = modprobe_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); |
615 | if (ret) { | |
616 | goto error; | |
617 | } | |
618 | return ret; | |
619 | ||
620 | error: | |
621 | free_probes(); | |
622 | return ret; | |
096102bd | 623 | } |