code.delx.au - pulseaudio/blob - src/modules/module-udev-detect.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2009 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <errno.h>
  27 #include <limits.h>
  28 #include <dirent.h>
  29 #include <sys/inotify.h>
  30 #include <libudev.h>
  31
  32 #include <pulse/timeval.h>
  33
  34 #include <pulsecore/modargs.h>
  35 #include <pulsecore/core-error.h>
  36 #include <pulsecore/core-util.h>
  37 #include <pulsecore/namereg.h>
  38 #include <pulsecore/ratelimit.h>
  39
  40 #include "module-udev-detect-symdef.h"
  41
  42 PA_MODULE_AUTHOR("Lennart Poettering");
  43 PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
  44 PA_MODULE_VERSION(PACKAGE_VERSION);
  45 PA_MODULE_LOAD_ONCE(TRUE);
  46 PA_MODULE_USAGE(
  47         "tsched=<enable system timer based scheduling mode?> "
  48         "ignore_dB=<ignore dB information from the device?>");
  49
  50 struct device {
  51     char *path;
  52     pa_bool_t need_verify;
  53     char *card_name;
  54     char *args;
  55     uint32_t module;
  56     pa_ratelimit ratelimit;
  57 };
  58
  59 struct userdata {
  60     pa_core *core;
  61     pa_hashmap *devices;
  62
  63     pa_bool_t use_tsched:1;
  64     pa_bool_t ignore_dB:1;
  65
  66     struct udev* udev;
  67     struct udev_monitor *monitor;
  68     pa_io_event *udev_io;
  69
  70     int inotify_fd;
  71     pa_io_event *inotify_io;
  72 };
  73
  74 static const char* const valid_modargs[] = {
  75     "tsched",
  76     "ignore_dB",
  77     NULL
  78 };
  79
  80 static int setup_inotify(struct userdata *u);
  81
  82 static void device_free(struct device *d) {
  83     pa_assert(d);
  84
  85     pa_xfree(d->path);
  86     pa_xfree(d->card_name);
  87     pa_xfree(d->args);
  88     pa_xfree(d);
  89 }
  90
  91 static const char *path_get_card_id(const char *path) {
  92     const char *e;
  93
  94     if (!path)
  95         return NULL;
  96
  97     if (!(e = strrchr(path, '/')))
  98         return NULL;
  99
 100     if (!pa_startswith(e, "/card"))
 101         return NULL;
 102
 103     return e + 5;
 104 }
 105
 106 static pa_bool_t is_card_busy(const char *id) {
 107     char *card_path = NULL, *pcm_path = NULL, *sub_status = NULL;
 108     DIR *card_dir = NULL, *pcm_dir = NULL;
 109     FILE *status_file = NULL;
 110     size_t len;
 111     struct dirent *space = NULL, *de;
 112     pa_bool_t busy = FALSE;
 113     int r;
 114
 115     pa_assert(id);
 116
 117     /* This simply uses /proc/asound/card.../pcm.../sub.../status to
 118      * check whether there is still a process using this audio device. */
 119
 120     card_path = pa_sprintf_malloc("/proc/asound/card%s", id);
 121
 122     if (!(card_dir = opendir(card_path))) {
 123         pa_log_warn("Failed to open %s: %s", card_path, pa_cstrerror(errno));
 124         goto fail;
 125     }
 126
 127     len = offsetof(struct dirent, d_name) + fpathconf(dirfd(card_dir), _PC_NAME_MAX) + 1;
 128     space = pa_xmalloc(len);
 129
 130     for (;;) {
 131         de = NULL;
 132
 133         if ((r = readdir_r(card_dir, space, &de)) != 0) {
 134             pa_log_warn("readdir_r() failed: %s", pa_cstrerror(r));
 135             goto fail;
 136         }
 137
 138         if (!de)
 139             break;
 140
 141         if (!pa_startswith(de->d_name, "pcm"))
 142             continue;
 143
 144         pa_xfree(pcm_path);
 145         pcm_path = pa_sprintf_malloc("%s/%s", card_path, de->d_name);
 146
 147         if (pcm_dir)
 148             closedir(pcm_dir);
 149
 150         if (!(pcm_dir = opendir(pcm_path))) {
 151             pa_log_warn("Failed to open %s: %s", pcm_path, pa_cstrerror(errno));
 152             continue;
 153         }
 154
 155         for (;;) {
 156             char line[32];
 157
 158             if ((r = readdir_r(pcm_dir, space, &de)) != 0) {
 159                 pa_log_warn("readdir_r() failed: %s", pa_cstrerror(r));
 160                 goto fail;
 161             }
 162
 163             if (!de)
 164                 break;
 165
 166             if (!pa_startswith(de->d_name, "sub"))
 167                 continue;
 168
 169             pa_xfree(sub_status);
 170             sub_status = pa_sprintf_malloc("%s/%s/status", pcm_path, de->d_name);
 171
 172             if (status_file)
 173                 fclose(status_file);
 174
 175             if (!(status_file = pa_fopen_cloexec(sub_status, "r"))) {
 176                 pa_log_warn("Failed to open %s: %s", sub_status, pa_cstrerror(errno));
 177                 continue;
 178             }
 179
 180             if (!(fgets(line, sizeof(line)-1, status_file))) {
 181                 pa_log_warn("Failed to read from %s: %s", sub_status, pa_cstrerror(errno));
 182                 continue;
 183             }
 184
 185             if (!pa_streq(line, "closed\n")) {
 186                 busy = TRUE;
 187                 break;
 188             }
 189         }
 190     }
 191
 192 fail:
 193
 194     pa_xfree(card_path);
 195     pa_xfree(pcm_path);
 196     pa_xfree(sub_status);
 197     pa_xfree(space);
 198
 199     if (card_dir)
 200         closedir(card_dir);
 201
 202     if (pcm_dir)
 203         closedir(pcm_dir);
 204
 205     if (status_file)
 206         fclose(status_file);
 207
 208     return busy;
 209 }
 210
 211 static void verify_access(struct userdata *u, struct device *d) {
 212     char *cd;
 213     pa_card *card;
 214     pa_bool_t accessible;
 215
 216     pa_assert(u);
 217     pa_assert(d);
 218
 219     cd = pa_sprintf_malloc("%s/snd/controlC%s", udev_get_dev_path(u->udev), path_get_card_id(d->path));
 220     accessible = access(cd, R_OK|W_OK) >= 0;
 221     pa_log_debug("%s is accessible: %s", cd, pa_yes_no(accessible));
 222
 223     pa_xfree(cd);
 224
 225     if (d->module == PA_INVALID_INDEX) {
 226
 227         /* If we are not loaded, try to load */
 228
 229         if (accessible) {
 230             pa_module *m;
 231             pa_bool_t busy;
 232
 233             /* Check if any of the PCM devices that belong to this
 234              * card are currently busy. If they are, don't try to load
 235              * right now, to make sure the probing phase can
 236              * successfully complete. When the current user of the
 237              * device closes it we will get another notification via
 238              * inotify and can then recheck. */
 239
 240             busy = is_card_busy(path_get_card_id(d->path));
 241             pa_log_debug("%s is busy: %s", d->path, pa_yes_no(busy));
 242
 243             if (!busy) {
 244
 245                 /* So, why do we rate limit here? It's certainly ugly,
 246                  * but there seems to be no other way. Problem is
 247                  * this: if we are unable to configure/probe an audio
 248                  * device after opening it we will close it again and
 249                  * the module initialization will fail. This will then
 250                  * cause an inotify event on the device node which
 251                  * will be forwarded to us. We then try to reopen the
 252                  * audio device again, practically entering a busy
 253                  * loop.
 254                  *
 255                  * A clean fix would be if we would be able to ignore
 256                  * our own inotify close events. However, inotify
 257                  * lacks such functionality. Also, during probing of
 258                  * the device we cannot really distuingish between
 259                  * other processes causing EBUSY or ourselves, which
 260                  * means we have no way to figure out if the probing
 261                  * during opening was canceled by a "try again"
 262                  * failure or a "fatal" failure. */
 263
 264                 if (pa_ratelimit_test(&d->ratelimit)) {
 265                     pa_log_debug("Loading module-alsa-card with arguments '%s'", d->args);
 266                     m = pa_module_load(u->core, "module-alsa-card", d->args);
 267
 268                     if (m) {
 269                         d->module = m->index;
 270                         pa_log_info("Card %s (%s) module loaded.", d->path, d->card_name);
 271                     } else
 272                         pa_log_info("Card %s (%s) failed to load module.", d->path, d->card_name);
 273                 } else
 274                     pa_log_warn("Tried to configure %s (%s) more often than %u times in %llus",
 275                                 d->path,
 276                                 d->card_name,
 277                                 d->ratelimit.burst,
 278                                 (long long unsigned) (d->ratelimit.interval / PA_USEC_PER_SEC));
 279             }
 280         }
 281
 282     } else {
 283
 284         /* If we are already loaded update suspend status with
 285          * accessible boolean */
 286
 287         if ((card = pa_namereg_get(u->core, d->card_name, PA_NAMEREG_CARD)))
 288             pa_card_suspend(card, !accessible, PA_SUSPEND_SESSION);
 289     }
 290 }
 291
 292 static void card_changed(struct userdata *u, struct udev_device *dev) {
 293     struct device *d;
 294     const char *path;
 295     const char *t;
 296     char *n;
 297
 298     pa_assert(u);
 299     pa_assert(dev);
 300
 301     /* Maybe /dev/snd is now available? */
 302     setup_inotify(u);
 303
 304     path = udev_device_get_devpath(dev);
 305
 306     if ((d = pa_hashmap_get(u->devices, path))) {
 307         verify_access(u, d);
 308         return;
 309     }
 310
 311     d = pa_xnew0(struct device, 1);
 312     d->path = pa_xstrdup(path);
 313     d->module = PA_INVALID_INDEX;
 314     PA_INIT_RATELIMIT(d->ratelimit, 10*PA_USEC_PER_SEC, 5);
 315
 316     if (!(t = udev_device_get_property_value(dev, "PULSE_NAME")))
 317         if (!(t = udev_device_get_property_value(dev, "ID_ID")))
 318             if (!(t = udev_device_get_property_value(dev, "ID_PATH")))
 319                 t = path_get_card_id(path);
 320
 321     n = pa_namereg_make_valid_name(t);
 322     d->card_name = pa_sprintf_malloc("alsa_card.%s", n);
 323     d->args = pa_sprintf_malloc("device_id=\"%s\" "
 324                                 "name=\"%s\" "
 325                                 "card_name=\"%s\" "
 326                                 "tsched=%s "
 327                                 "ignore_dB=%s "
 328                                 "card_properties=\"module-udev-detect.discovered=1\"",
 329                                 path_get_card_id(path),
 330                                 n,
 331                                 d->card_name,
 332                                 pa_yes_no(u->use_tsched),
 333                                 pa_yes_no(u->ignore_dB));
 334     pa_xfree(n);
 335
 336     pa_hashmap_put(u->devices, d->path, d);
 337
 338     verify_access(u, d);
 339 }
 340
 341 static void remove_card(struct userdata *u, struct udev_device *dev) {
 342     struct device *d;
 343
 344     pa_assert(u);
 345     pa_assert(dev);
 346
 347     if (!(d = pa_hashmap_remove(u->devices, udev_device_get_devpath(dev))))
 348         return;
 349
 350     pa_log_info("Card %s removed.", d->path);
 351
 352     if (d->module != PA_INVALID_INDEX)
 353         pa_module_unload_request_by_index(u->core, d->module, TRUE);
 354
 355     device_free(d);
 356 }
 357
 358 static void process_device(struct userdata *u, struct udev_device *dev) {
 359     const char *action, *ff;
 360
 361     pa_assert(u);
 362     pa_assert(dev);
 363
 364     if (udev_device_get_property_value(dev, "PULSE_IGNORE")) {
 365         pa_log_debug("Ignoring %s, because marked so.", udev_device_get_devpath(dev));
 366         return;
 367     }
 368
 369     if ((ff = udev_device_get_property_value(dev, "SOUND_CLASS")) &&
 370         pa_streq(ff, "modem")) {
 371         pa_log_debug("Ignoring %s, because it is a modem.", udev_device_get_devpath(dev));
 372         return;
 373     }
 374
 375     action = udev_device_get_action(dev);
 376
 377     if (action && pa_streq(action, "remove"))
 378         remove_card(u, dev);
 379     else if ((!action || pa_streq(action, "change")) &&
 380              udev_device_get_property_value(dev, "SOUND_INITIALIZED"))
 381         card_changed(u, dev);
 382
 383     /* For an explanation why we don't look for 'add' events here
 384      * have a look into /lib/udev/rules.d/78-sound-card.rules! */
 385 }
 386
 387 static void process_path(struct userdata *u, const char *path) {
 388     struct udev_device *dev;
 389
 390     if (!path_get_card_id(path))
 391         return;
 392
 393     if (!(dev = udev_device_new_from_syspath(u->udev, path))) {
 394         pa_log("Failed to get udev device object from udev.");
 395         return;
 396     }
 397
 398     process_device(u, dev);
 399     udev_device_unref(dev);
 400 }
 401
 402 static void monitor_cb(
 403         pa_mainloop_api*a,
 404         pa_io_event* e,
 405         int fd,
 406         pa_io_event_flags_t events,
 407         void *userdata) {
 408
 409     struct userdata *u = userdata;
 410     struct udev_device *dev;
 411
 412     pa_assert(a);
 413
 414     if (!(dev = udev_monitor_receive_device(u->monitor))) {
 415         pa_log("Failed to get udev device object from monitor.");
 416         goto fail;
 417     }
 418
 419     if (!path_get_card_id(udev_device_get_devpath(dev))) {
 420         udev_device_unref(dev);
 421         return;
 422     }
 423
 424     process_device(u, dev);
 425     udev_device_unref(dev);
 426     return;
 427
 428 fail:
 429     a->io_free(u->udev_io);
 430     u->udev_io = NULL;
 431 }
 432
 433 static pa_bool_t pcm_node_belongs_to_device(
 434         struct device *d,
 435         const char *node) {
 436
 437     char *cd;
 438     pa_bool_t b;
 439
 440     cd = pa_sprintf_malloc("pcmC%sD", path_get_card_id(d->path));
 441     b = pa_startswith(node, cd);
 442     pa_xfree(cd);
 443
 444     return b;
 445 }
 446
 447 static pa_bool_t control_node_belongs_to_device(
 448         struct device *d,
 449         const char *node) {
 450
 451     char *cd;
 452     pa_bool_t b;
 453
 454     cd = pa_sprintf_malloc("controlC%s", path_get_card_id(d->path));
 455     b = pa_streq(node, cd);
 456     pa_xfree(cd);
 457
 458     return b;
 459 }
 460
 461 static void inotify_cb(
 462         pa_mainloop_api*a,
 463         pa_io_event* e,
 464         int fd,
 465         pa_io_event_flags_t events,
 466         void *userdata) {
 467
 468     struct {
 469         struct inotify_event e;
 470         char name[NAME_MAX];
 471     } buf;
 472     struct userdata *u = userdata;
 473     static int type = 0;
 474     pa_bool_t deleted = FALSE;
 475     struct device *d;
 476     void *state;
 477
 478     for (;;) {
 479         ssize_t r;
 480         struct inotify_event *event;
 481
 482         pa_zero(buf);
 483         if ((r = pa_read(fd, &buf, sizeof(buf), &type)) <= 0) {
 484
 485             if (r < 0 && errno == EAGAIN)
 486                 break;
 487
 488             pa_log("read() from inotify failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 489             goto fail;
 490         }
 491
 492         event = &buf.e;
 493         while (r > 0) {
 494             size_t len;
 495
 496             if ((size_t) r < sizeof(struct inotify_event)) {
 497                 pa_log("read() too short.");
 498                 goto fail;
 499             }
 500
 501             len = sizeof(struct inotify_event) + event->len;
 502
 503             if ((size_t) r < len) {
 504                 pa_log("Payload missing.");
 505                 goto fail;
 506             }
 507
 508             /* From udev we get the guarantee that the control
 509              * device's ACL is changed last. To avoid races when ACLs
 510              * are changed we hence watch only the control device */
 511             if (((event->mask & IN_ATTRIB) && pa_startswith(event->name, "controlC")))
 512                 PA_HASHMAP_FOREACH(d, u->devices, state)
 513                     if (control_node_belongs_to_device(d, event->name))
 514                         d->need_verify = TRUE;
 515
 516             /* ALSA doesn't really give us any guarantee on the closing
 517              * order, so let's simply hope */
 518             if (((event->mask & IN_CLOSE_WRITE) && pa_startswith(event->name, "pcmC")))
 519                 PA_HASHMAP_FOREACH(d, u->devices, state)
 520                     if (pcm_node_belongs_to_device(d, event->name))
 521                         d->need_verify = TRUE;
 522
 523             /* /dev/snd/ might have been removed */
 524             if ((event->mask & (IN_DELETE_SELF|IN_MOVE_SELF)))
 525                 deleted = TRUE;
 526
 527             event = (struct inotify_event*) ((uint8_t*) event + len);
 528             r -= len;
 529         }
 530     }
 531
 532     PA_HASHMAP_FOREACH(d, u->devices, state)
 533         if (d->need_verify) {
 534             d->need_verify = FALSE;
 535             verify_access(u, d);
 536         }
 537
 538     if (!deleted)
 539         return;
 540
 541 fail:
 542     if (u->inotify_io) {
 543         a->io_free(u->inotify_io);
 544         u->inotify_io = NULL;
 545     }
 546
 547     if (u->inotify_fd >= 0) {
 548         pa_close(u->inotify_fd);
 549         u->inotify_fd = -1;
 550     }
 551 }
 552
 553 static int setup_inotify(struct userdata *u) {
 554     char *dev_snd;
 555     int r;
 556
 557     if (u->inotify_fd >= 0)
 558         return 0;
 559
 560     if ((u->inotify_fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
 561         pa_log("inotify_init1() failed: %s", pa_cstrerror(errno));
 562         return -1;
 563     }
 564
 565     dev_snd = pa_sprintf_malloc("%s/snd", udev_get_dev_path(u->udev));
 566     r = inotify_add_watch(u->inotify_fd, dev_snd, IN_ATTRIB|IN_CLOSE_WRITE|IN_DELETE_SELF|IN_MOVE_SELF);
 567     pa_xfree(dev_snd);
 568
 569     if (r < 0) {
 570         int saved_errno = errno;
 571
 572         pa_close(u->inotify_fd);
 573         u->inotify_fd = -1;
 574
 575         if (saved_errno == ENOENT) {
 576             pa_log_debug("/dev/snd/ is apparently not existing yet, retrying to create inotify watch later.");
 577             return 0;
 578         }
 579
 580         if (saved_errno == ENOSPC) {
 581             pa_log("You apparently ran out of inotify watches, probably because Tracker/Beagle took them all away. "
 582                    "I wished people would do their homework first and fix inotify before using it for watching whole "
 583                    "directory trees which is something the current inotify is certainly not useful for. "
 584                    "Please make sure to drop the Tracker/Beagle guys a line complaining about their broken use of inotify.");
 585             return 0;
 586         }
 587
 588         pa_log("inotify_add_watch() failed: %s", pa_cstrerror(saved_errno));
 589         return -1;
 590     }
 591
 592     pa_assert_se(u->inotify_io = u->core->mainloop->io_new(u->core->mainloop, u->inotify_fd, PA_IO_EVENT_INPUT, inotify_cb, u));
 593
 594     return 0;
 595 }
 596
 597 int pa__init(pa_module *m) {
 598     struct userdata *u = NULL;
 599     pa_modargs *ma;
 600     struct udev_enumerate *enumerate = NULL;
 601     struct udev_list_entry *item = NULL, *first = NULL;
 602     int fd;
 603     pa_bool_t use_tsched = TRUE, ignore_dB = FALSE;
 604
 605     pa_assert(m);
 606
 607     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 608         pa_log("Failed to parse module arguments");
 609         goto fail;
 610     }
 611
 612     m->userdata = u = pa_xnew0(struct userdata, 1);
 613     u->core = m->core;
 614     u->devices = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 615     u->inotify_fd = -1;
 616
 617     if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
 618         pa_log("Failed to parse tsched= argument.");
 619         goto fail;
 620     }
 621     u->use_tsched = use_tsched;
 622
 623     if (pa_modargs_get_value_boolean(ma, "ignore_dB", &ignore_dB) < 0) {
 624         pa_log("Failed to parse ignore_dB= argument.");
 625         goto fail;
 626     }
 627     u->ignore_dB = ignore_dB;
 628
 629     if (!(u->udev = udev_new())) {
 630         pa_log("Failed to initialize udev library.");
 631         goto fail;
 632     }
 633
 634     if (setup_inotify(u) < 0)
 635         goto fail;
 636
 637     if (!(u->monitor = udev_monitor_new_from_netlink(u->udev, "udev"))) {
 638         pa_log("Failed to initialize monitor.");
 639         goto fail;
 640     }
 641
 642     if (udev_monitor_filter_add_match_subsystem_devtype(u->monitor, "sound", NULL) < 0) {
 643         pa_log("Failed to subscribe to sound devices.");
 644         goto fail;
 645     }
 646
 647     errno = 0;
 648     if (udev_monitor_enable_receiving(u->monitor) < 0) {
 649         pa_log("Failed to enable monitor: %s", pa_cstrerror(errno));
 650         if (errno == EPERM)
 651             pa_log_info("Most likely your kernel is simply too old and "
 652                         "allows only priviliged processes to listen to device events. "
 653                         "Please upgrade your kernel to at least 2.6.30.");
 654         goto fail;
 655     }
 656
 657     if ((fd = udev_monitor_get_fd(u->monitor)) < 0) {
 658         pa_log("Failed to get udev monitor fd.");
 659         goto fail;
 660     }
 661
 662     pa_assert_se(u->udev_io = u->core->mainloop->io_new(u->core->mainloop, fd, PA_IO_EVENT_INPUT, monitor_cb, u));
 663
 664     if (!(enumerate = udev_enumerate_new(u->udev))) {
 665         pa_log("Failed to initialize udev enumerator.");
 666         goto fail;
 667     }
 668
 669     if (udev_enumerate_add_match_subsystem(enumerate, "sound") < 0) {
 670         pa_log("Failed to match to subsystem.");
 671         goto fail;
 672     }
 673
 674     if (udev_enumerate_scan_devices(enumerate) < 0) {
 675         pa_log("Failed to scan for devices.");
 676         goto fail;
 677     }
 678
 679     first = udev_enumerate_get_list_entry(enumerate);
 680     udev_list_entry_foreach(item, first)
 681         process_path(u, udev_list_entry_get_name(item));
 682
 683     udev_enumerate_unref(enumerate);
 684
 685     pa_log_info("Found %u cards.", pa_hashmap_size(u->devices));
 686
 687     pa_modargs_free(ma);
 688
 689     return 0;
 690
 691 fail:
 692
 693     if (enumerate)
 694         udev_enumerate_unref(enumerate);
 695
 696     if (ma)
 697         pa_modargs_free(ma);
 698
 699     pa__done(m);
 700
 701     return -1;
 702 }
 703
 704 void pa__done(pa_module *m) {
 705     struct userdata *u;
 706
 707     pa_assert(m);
 708
 709     if (!(u = m->userdata))
 710         return;
 711
 712     if (u->udev_io)
 713         m->core->mainloop->io_free(u->udev_io);
 714
 715     if (u->monitor)
 716         udev_monitor_unref(u->monitor);
 717
 718     if (u->udev)
 719         udev_unref(u->udev);
 720
 721     if (u->inotify_io)
 722         m->core->mainloop->io_free(u->inotify_io);
 723
 724     if (u->inotify_fd >= 0)
 725         pa_close(u->inotify_fd);
 726
 727     if (u->devices) {
 728         struct device *d;
 729
 730         while ((d = pa_hashmap_steal_first(u->devices)))
 731             device_free(d);
 732
 733         pa_hashmap_free(u->devices, NULL, NULL);
 734     }
 735
 736     pa_xfree(u);
 737 }