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 */ | |
33 | struct kern_modules_param kern_modules_control_core[] = { | |
b53d4e59 SM |
34 | { (char *) "lttng-ring-buffer-client-discard" }, |
35 | { (char *) "lttng-ring-buffer-client-overwrite" }, | |
36 | { (char *) "lttng-ring-buffer-metadata-client" }, | |
37 | { (char *) "lttng-ring-buffer-client-mmap-discard" }, | |
38 | { (char *) "lttng-ring-buffer-client-mmap-overwrite" }, | |
39 | { (char *) "lttng-ring-buffer-metadata-mmap-client" }, | |
ab57d7d3 JG |
40 | }; |
41 | ||
3fa9646c | 42 | /* LTTng kernel tracer probe modules list */ |
fbb9748b | 43 | struct kern_modules_param kern_modules_probes_default[] = { |
b53d4e59 SM |
44 | { (char *) "lttng-probe-asoc" }, |
45 | { (char *) "lttng-probe-block" }, | |
46 | { (char *) "lttng-probe-btrfs" }, | |
47 | { (char *) "lttng-probe-compaction" }, | |
48 | { (char *) "lttng-probe-ext3" }, | |
49 | { (char *) "lttng-probe-ext4" }, | |
50 | { (char *) "lttng-probe-gpio" }, | |
51 | { (char *) "lttng-probe-i2c" }, | |
52 | { (char *) "lttng-probe-irq" }, | |
53 | { (char *) "lttng-probe-jbd" }, | |
54 | { (char *) "lttng-probe-jbd2" }, | |
55 | { (char *) "lttng-probe-kmem" }, | |
56 | { (char *) "lttng-probe-kvm" }, | |
57 | { (char *) "lttng-probe-kvm-x86" }, | |
58 | { (char *) "lttng-probe-kvm-x86-mmu" }, | |
59 | { (char *) "lttng-probe-lock" }, | |
60 | { (char *) "lttng-probe-module" }, | |
61 | { (char *) "lttng-probe-napi" }, | |
62 | { (char *) "lttng-probe-net" }, | |
63 | { (char *) "lttng-probe-power" }, | |
64 | { (char *) "lttng-probe-preemptirq" }, | |
65 | { (char *) "lttng-probe-printk" }, | |
66 | { (char *) "lttng-probe-random" }, | |
67 | { (char *) "lttng-probe-rcu" }, | |
68 | { (char *) "lttng-probe-regmap" }, | |
69 | { (char *) "lttng-probe-regulator" }, | |
70 | { (char *) "lttng-probe-rpm" }, | |
71 | { (char *) "lttng-probe-sched" }, | |
72 | { (char *) "lttng-probe-scsi" }, | |
73 | { (char *) "lttng-probe-signal" }, | |
74 | { (char *) "lttng-probe-skb" }, | |
75 | { (char *) "lttng-probe-sock" }, | |
76 | { (char *) "lttng-probe-statedump" }, | |
77 | { (char *) "lttng-probe-sunrpc" }, | |
78 | { (char *) "lttng-probe-timer" }, | |
79 | { (char *) "lttng-probe-udp" }, | |
80 | { (char *) "lttng-probe-vmscan" }, | |
81 | { (char *) "lttng-probe-v4l2" }, | |
82 | { (char *) "lttng-probe-workqueue" }, | |
83 | { (char *) "lttng-probe-writeback" }, | |
84 | { (char *) "lttng-probe-x86-irq-vectors" }, | |
85 | { (char *) "lttng-probe-x86-exceptions" }, | |
096102bd DG |
86 | }; |
87 | ||
fbb9748b JG |
88 | /* dynamic probe modules list */ |
89 | static struct kern_modules_param *probes; | |
90 | static int nr_probes; | |
c9d42407 | 91 | static int probes_capacity; |
fbb9748b | 92 | |
234170ac UTL |
93 | #if HAVE_KMOD |
94 | #include <libkmod.h> | |
866c17ce | 95 | |
d11b2027 MJ |
96 | /** |
97 | * @brief Logging function for libkmod integration. | |
98 | */ | |
234170ac UTL |
99 | static void log_kmod(void *data, int priority, const char *file, int line, |
100 | const char *fn, const char *format, va_list args) | |
101 | { | |
102 | char *str; | |
103 | ||
104 | if (vasprintf(&str, format, args) < 0) { | |
105 | return; | |
106 | } | |
107 | ||
108 | DBG("libkmod: %s", str); | |
109 | free(str); | |
110 | } | |
866c17ce | 111 | |
d11b2027 MJ |
112 | /** |
113 | * @brief Setup the libkmod context. | |
114 | * | |
115 | * Create the context, add a custom logging function and preload the | |
116 | * ressources for faster operation. | |
117 | * | |
118 | * @returns \c 0 on success | |
119 | * \c < 0 on error | |
120 | */ | |
866c17ce | 121 | static int setup_kmod_ctx(struct kmod_ctx **ctx) |
234170ac | 122 | { |
866c17ce | 123 | int ret = 0; |
234170ac | 124 | |
866c17ce | 125 | *ctx = kmod_new(NULL, NULL); |
234170ac UTL |
126 | if (!ctx) { |
127 | PERROR("Unable to create kmod library context"); | |
128 | ret = -ENOMEM; | |
129 | goto error; | |
130 | } | |
131 | ||
866c17ce MJ |
132 | kmod_set_log_fn(*ctx, log_kmod, NULL); |
133 | ret = kmod_load_resources(*ctx); | |
134 | if (ret < 0) { | |
135 | ERR("Failed to load kmod library resources"); | |
136 | goto error; | |
137 | } | |
138 | ||
139 | error: | |
140 | return ret; | |
141 | } | |
142 | ||
d11b2027 MJ |
143 | /** |
144 | * @brief Loads the kernel modules in \p modules | |
145 | * | |
146 | * @param modules List of modules to load | |
147 | * @param entries Number of modules in the list | |
148 | * @param required Are the modules required or optionnal | |
149 | * | |
150 | * If the modules are required, we will return with error after the | |
151 | * first failed module load, otherwise we continue loading. | |
152 | * | |
153 | * @returns \c 0 on success | |
154 | * \c < 0 on error | |
155 | */ | |
866c17ce MJ |
156 | static int modprobe_lttng(struct kern_modules_param *modules, |
157 | int entries, int required) | |
158 | { | |
159 | int ret = 0, i; | |
160 | struct kmod_ctx *ctx; | |
161 | ||
162 | ret = setup_kmod_ctx(&ctx); | |
163 | if (ret < 0) { | |
164 | goto error; | |
165 | } | |
234170ac UTL |
166 | |
167 | for (i = 0; i < entries; i++) { | |
168 | struct kmod_module *mod = NULL; | |
169 | ||
170 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
171 | if (ret < 0) { | |
172 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
173 | goto error; | |
174 | } | |
175 | ||
0b1e16b8 | 176 | ret = kmod_module_probe_insert_module(mod, 0, |
234170ac | 177 | NULL, NULL, NULL, NULL); |
0b1e16b8 MJ |
178 | if (ret == -EEXIST) { |
179 | DBG("Module %s is already loaded", modules[i].name); | |
180 | ret = 0; | |
181 | } else if (ret < 0) { | |
16c2e854 PP |
182 | if (required) { |
183 | ERR("Unable to load required module %s", | |
184 | modules[i].name); | |
185 | goto error; | |
186 | } else { | |
187 | DBG("Unable to load optional module %s; continuing", | |
188 | modules[i].name); | |
189 | ret = 0; | |
190 | } | |
234170ac UTL |
191 | } else { |
192 | DBG("Modprobe successfully %s", modules[i].name); | |
4ad664a0 | 193 | modules[i].loaded = true; |
234170ac UTL |
194 | } |
195 | ||
196 | kmod_module_unref(mod); | |
197 | } | |
198 | ||
199 | error: | |
200 | if (ctx) { | |
201 | kmod_unref(ctx); | |
202 | } | |
203 | return ret; | |
204 | } | |
205 | ||
d11b2027 MJ |
206 | /** |
207 | * @brief Recursively unload modules. | |
208 | * | |
209 | * This function implements the same modules unloading behavior as | |
210 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
211 | * dependencies and unload modules with a refcount of 0. | |
212 | * | |
213 | * @param mod The module to unload | |
214 | * | |
215 | * @returns \c 0 on success | |
216 | * \c < 0 on error | |
217 | */ | |
866c17ce MJ |
218 | static int rmmod_recurse(struct kmod_module *mod) { |
219 | int ret = 0; | |
220 | struct kmod_list *deps, *itr; | |
221 | ||
222 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
223 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | ret = kmod_module_remove_module(mod, 0); | |
228 | ||
229 | deps = kmod_module_get_dependencies(mod); | |
230 | if (deps != NULL) { | |
231 | kmod_list_foreach(itr, deps) { | |
232 | struct kmod_module *dep = kmod_module_get_module(itr); | |
233 | if (kmod_module_get_refcnt(dep) == 0) { | |
234 | DBG("Recursive remove module %s", | |
235 | kmod_module_get_name(dep)); | |
236 | rmmod_recurse(dep); | |
237 | } | |
238 | kmod_module_unref(dep); | |
239 | } | |
240 | kmod_module_unref_list(deps); | |
241 | } | |
242 | ||
243 | return ret; | |
244 | } | |
245 | ||
d11b2027 MJ |
246 | /** |
247 | * @brief Unloads the kernel modules in \p modules | |
248 | * | |
249 | * @param modules List of modules to unload | |
250 | * @param entries Number of modules in the list | |
251 | * @param required Are the modules required or optionnal | |
252 | * | |
253 | */ | |
866c17ce MJ |
254 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
255 | int entries, int required) | |
256 | { | |
257 | int ret = 0, i; | |
258 | struct kmod_ctx *ctx; | |
259 | ||
260 | ret = setup_kmod_ctx(&ctx); | |
261 | if (ret < 0) { | |
262 | goto error; | |
263 | } | |
264 | ||
265 | for (i = entries - 1; i >= 0; i--) { | |
266 | struct kmod_module *mod = NULL; | |
267 | ||
4ad664a0 JG |
268 | if (!modules[i].loaded) { |
269 | continue; | |
270 | } | |
271 | ||
866c17ce MJ |
272 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
273 | if (ret < 0) { | |
274 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
275 | goto error; | |
276 | } | |
277 | ||
278 | ret = rmmod_recurse(mod); | |
279 | if (ret == -EEXIST) { | |
280 | DBG("Module %s is not in kernel.", modules[i].name); | |
281 | } else if (required && ret < 0) { | |
282 | ERR("Unable to remove module %s", modules[i].name); | |
283 | } else { | |
284 | DBG("Modprobe removal successful %s", | |
285 | modules[i].name); | |
286 | } | |
287 | ||
288 | kmod_module_unref(mod); | |
289 | } | |
290 | ||
291 | error: | |
292 | if (ctx) { | |
293 | kmod_unref(ctx); | |
294 | } | |
295 | } | |
296 | ||
234170ac UTL |
297 | #else /* HAVE_KMOD */ |
298 | ||
fbb9748b | 299 | static int modprobe_lttng(struct kern_modules_param *modules, |
234170ac | 300 | int entries, int required) |
096102bd DG |
301 | { |
302 | int ret = 0, i; | |
303 | char modprobe[256]; | |
304 | ||
e23b81ed | 305 | for (i = 0; i < entries; i++) { |
096102bd DG |
306 | ret = snprintf(modprobe, sizeof(modprobe), |
307 | "/sbin/modprobe %s%s", | |
ab57d7d3 | 308 | required ? "" : "-q ", |
e23b81ed | 309 | modules[i].name); |
096102bd DG |
310 | if (ret < 0) { |
311 | PERROR("snprintf modprobe"); | |
312 | goto error; | |
313 | } | |
314 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
315 | ret = system(modprobe); | |
316 | if (ret == -1) { | |
16c2e854 PP |
317 | if (required) { |
318 | ERR("Unable to launch modprobe for required module %s", | |
319 | modules[i].name); | |
320 | goto error; | |
321 | } else { | |
322 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
323 | modules[i].name); | |
324 | ret = 0; | |
325 | } | |
326 | } else if (WEXITSTATUS(ret) != 0) { | |
327 | if (required) { | |
328 | ERR("Unable to load required module %s", | |
329 | modules[i].name); | |
330 | goto error; | |
331 | } else { | |
332 | DBG("Unable to load optional module %s; continuing", | |
333 | modules[i].name); | |
334 | ret = 0; | |
335 | } | |
096102bd | 336 | } else { |
ab57d7d3 | 337 | DBG("Modprobe successfully %s", modules[i].name); |
355d2778 | 338 | modules[i].loaded = true; |
096102bd DG |
339 | } |
340 | } | |
341 | ||
342 | error: | |
343 | return ret; | |
344 | } | |
345 | ||
35e090b7 MJ |
346 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
347 | int entries, int required) | |
348 | { | |
349 | int ret = 0, i; | |
350 | char modprobe[256]; | |
351 | ||
352 | for (i = entries - 1; i >= 0; i--) { | |
4ad664a0 JG |
353 | if (!modules[i].loaded) { |
354 | continue; | |
355 | } | |
35e090b7 MJ |
356 | ret = snprintf(modprobe, sizeof(modprobe), |
357 | "/sbin/modprobe -r -q %s", | |
358 | modules[i].name); | |
359 | if (ret < 0) { | |
360 | PERROR("snprintf modprobe -r"); | |
361 | return; | |
362 | } | |
363 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
364 | ret = system(modprobe); | |
365 | if (ret == -1) { | |
366 | ERR("Unable to launch modprobe -r for module %s", | |
367 | modules[i].name); | |
368 | } else if (required && WEXITSTATUS(ret) != 0) { | |
369 | ERR("Unable to remove module %s", | |
370 | modules[i].name); | |
371 | } else { | |
372 | DBG("Modprobe removal successful %s", | |
373 | modules[i].name); | |
374 | } | |
375 | } | |
376 | } | |
377 | ||
866c17ce MJ |
378 | #endif /* HAVE_KMOD */ |
379 | ||
35e090b7 MJ |
380 | /* |
381 | * Remove control kernel module(s) in reverse load order. | |
382 | */ | |
383 | void modprobe_remove_lttng_control(void) | |
384 | { | |
385 | modprobe_remove_lttng(kern_modules_control_core, | |
386 | ARRAY_SIZE(kern_modules_control_core), | |
387 | LTTNG_MOD_REQUIRED); | |
388 | } | |
389 | ||
390 | static void free_probes(void) | |
391 | { | |
392 | int i; | |
393 | ||
394 | if (!probes) { | |
395 | return; | |
396 | } | |
397 | for (i = 0; i < nr_probes; ++i) { | |
398 | free(probes[i].name); | |
399 | } | |
400 | free(probes); | |
401 | probes = NULL; | |
402 | nr_probes = 0; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Remove data kernel modules in reverse load order. | |
407 | */ | |
408 | void modprobe_remove_lttng_data(void) | |
409 | { | |
410 | if (!probes) { | |
411 | return; | |
412 | } | |
413 | modprobe_remove_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); | |
414 | free_probes(); | |
415 | } | |
416 | ||
417 | /* | |
418 | * Remove all kernel modules in reverse order. | |
419 | */ | |
420 | void modprobe_remove_lttng_all(void) | |
421 | { | |
422 | modprobe_remove_lttng_data(); | |
423 | modprobe_remove_lttng_control(); | |
424 | } | |
425 | ||
e23b81ed JG |
426 | /* |
427 | * Load control kernel module(s). | |
428 | */ | |
429 | int modprobe_lttng_control(void) | |
430 | { | |
ab57d7d3 JG |
431 | int ret; |
432 | ||
433 | ret = modprobe_lttng(kern_modules_control_core, | |
434 | ARRAY_SIZE(kern_modules_control_core), | |
435 | LTTNG_MOD_REQUIRED); | |
ab57d7d3 | 436 | return ret; |
e23b81ed | 437 | } |
ab57d7d3 | 438 | |
c9d42407 PP |
439 | /** |
440 | * Grow global list of probes (double capacity or set it to 1 if | |
441 | * currently 0 and copy existing data). | |
096102bd | 442 | */ |
c9d42407 | 443 | static int grow_probes(void) |
096102bd | 444 | { |
c9d42407 PP |
445 | int i; |
446 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 447 | |
c9d42407 PP |
448 | /* Initialize capacity to 1 if 0. */ |
449 | if (probes_capacity == 0) { | |
450 | probes = zmalloc(sizeof(*probes)); | |
451 | if (!probes) { | |
452 | PERROR("malloc probe list"); | |
453 | return -ENOMEM; | |
454 | } | |
455 | ||
456 | probes_capacity = 1; | |
457 | return 0; | |
fbb9748b JG |
458 | } |
459 | ||
c9d42407 PP |
460 | /* Double size. */ |
461 | probes_capacity *= 2; | |
462 | ||
463 | tmp_probes = zmalloc(sizeof(*tmp_probes) * probes_capacity); | |
464 | if (!tmp_probes) { | |
fbb9748b JG |
465 | PERROR("malloc probe list"); |
466 | return -ENOMEM; | |
467 | } | |
468 | ||
c9d42407 PP |
469 | for (i = 0; i < nr_probes; ++i) { |
470 | /* Move name pointer. */ | |
471 | tmp_probes[i].name = probes[i].name; | |
472 | } | |
473 | ||
474 | /* Replace probes with larger copy. */ | |
475 | free(probes); | |
476 | probes = tmp_probes; | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Appends a comma-separated list of probes to the global list | |
483 | * of probes. | |
484 | */ | |
485 | static int append_list_to_probes(const char *list) | |
486 | { | |
487 | char *next; | |
d3c04b7c | 488 | int ret; |
44603c80 | 489 | char *tmp_list, *cur_list; |
c9d42407 PP |
490 | |
491 | assert(list); | |
492 | ||
44603c80 | 493 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
494 | if (!tmp_list) { |
495 | PERROR("strdup temp list"); | |
496 | return -ENOMEM; | |
497 | } | |
498 | ||
499 | for (;;) { | |
fbb9748b | 500 | size_t name_len; |
c9d42407 | 501 | struct kern_modules_param *cur_mod; |
fbb9748b | 502 | |
44603c80 | 503 | next = strtok(cur_list, ","); |
fbb9748b | 504 | if (!next) { |
c9d42407 | 505 | break; |
fbb9748b | 506 | } |
44603c80 | 507 | cur_list = NULL; |
fbb9748b JG |
508 | |
509 | /* filter leading spaces */ | |
510 | while (*next == ' ') { | |
511 | next++; | |
512 | } | |
513 | ||
c9d42407 PP |
514 | if (probes_capacity <= nr_probes) { |
515 | ret = grow_probes(); | |
516 | if (ret) { | |
398d5459 | 517 | goto error; |
c9d42407 PP |
518 | } |
519 | } | |
520 | ||
fbb9748b JG |
521 | /* Length 13 is "lttng-probe-" + \0 */ |
522 | name_len = strlen(next) + 13; | |
523 | ||
d3c04b7c | 524 | cur_mod = &probes[nr_probes]; |
c9d42407 PP |
525 | cur_mod->name = zmalloc(name_len); |
526 | if (!cur_mod->name) { | |
fbb9748b | 527 | PERROR("malloc probe list"); |
398d5459 MD |
528 | ret = -ENOMEM; |
529 | goto error; | |
fbb9748b JG |
530 | } |
531 | ||
c9d42407 | 532 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
533 | if (ret < 0) { |
534 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
535 | ret = -ENOMEM; |
536 | goto error; | |
fbb9748b | 537 | } |
c9d42407 | 538 | |
c9d42407 | 539 | nr_probes++; |
fbb9748b JG |
540 | } |
541 | ||
c9d42407 | 542 | free(tmp_list); |
c9d42407 | 543 | return 0; |
398d5459 MD |
544 | |
545 | error: | |
546 | free(tmp_list); | |
547 | free_probes(); | |
548 | return ret; | |
c9d42407 PP |
549 | } |
550 | ||
551 | /* | |
552 | * Load data kernel module(s). | |
553 | */ | |
554 | int modprobe_lttng_data(void) | |
555 | { | |
556 | int ret, i; | |
557 | char *list; | |
558 | ||
559 | /* | |
560 | * Base probes: either from command line option, environment | |
561 | * variable or default list. | |
562 | */ | |
e6142f2e | 563 | list = config.kmod_probes_list.value; |
c9d42407 PP |
564 | if (list) { |
565 | /* User-specified probes. */ | |
566 | ret = append_list_to_probes(list); | |
c9d42407 PP |
567 | if (ret) { |
568 | return ret; | |
569 | } | |
570 | } else { | |
571 | /* Default probes. */ | |
572 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 573 | |
62e0422e | 574 | probes = zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
575 | if (!probes) { |
576 | PERROR("malloc probe list"); | |
577 | return -ENOMEM; | |
578 | } | |
579 | ||
580 | nr_probes = probes_capacity = def_len; | |
581 | ||
582 | for (i = 0; i < def_len; ++i) { | |
583 | char* name = strdup(kern_modules_probes_default[i].name); | |
584 | ||
585 | if (!name) { | |
586 | PERROR("strdup probe item"); | |
398d5459 MD |
587 | ret = -ENOMEM; |
588 | goto error; | |
c9d42407 PP |
589 | } |
590 | ||
591 | probes[i].name = name; | |
592 | } | |
593 | } | |
594 | ||
595 | /* | |
596 | * Extra modules? Append them to current probes list. | |
597 | */ | |
e6142f2e | 598 | list = config.kmod_extra_probes_list.value; |
c9d42407 PP |
599 | if (list) { |
600 | ret = append_list_to_probes(list); | |
601 | if (ret) { | |
398d5459 | 602 | goto error; |
c9d42407 PP |
603 | } |
604 | } | |
605 | ||
606 | /* | |
607 | * Load probes modules now. | |
608 | */ | |
398d5459 MD |
609 | ret = modprobe_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); |
610 | if (ret) { | |
611 | goto error; | |
612 | } | |
613 | return ret; | |
614 | ||
615 | error: | |
616 | free_probes(); | |
617 | return ret; | |
096102bd | 618 | } |