1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Initialization routines
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
7 #include <linux/init.h>
8 #include <linux/sched.h>
9 #include <linux/module.h>
10 #include <linux/device.h>
11 #include <linux/file.h>
12 #include <linux/slab.h>
13 #include <linux/time.h>
14 #include <linux/ctype.h>
16 #include <linux/completion.h>
18 #include <sound/core.h>
19 #include <sound/control.h>
20 #include <sound/info.h>
22 /* monitor files for graceful shutdown (hotplug) */
23 struct snd_monitor_file {
25 const struct file_operations *disconnected_f_op;
26 struct list_head shutdown_list; /* still need to shutdown */
27 struct list_head list; /* link of monitor files */
30 static DEFINE_SPINLOCK(shutdown_lock);
31 static LIST_HEAD(shutdown_files);
33 static const struct file_operations snd_shutdown_f_ops;
35 /* locked for registering/using */
36 static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS);
37 static struct snd_card *snd_cards[SNDRV_CARDS];
39 static DEFINE_MUTEX(snd_card_mutex);
41 static char *slots[SNDRV_CARDS];
42 module_param_array(slots, charp, NULL, 0444);
43 MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
45 /* return non-zero if the given index is reserved for the given
46 * module via slots option
48 static int module_slot_match(struct module *module, int idx)
54 if (!module || !*module->name || !slots[idx])
60 match = 0; /* negative match */
63 /* compare module name strings
64 * hyphens are handled as equivalent with underscore
82 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
83 int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
84 EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
87 static int check_empty_slot(struct module *module, int slot)
89 return !slots[slot] || !*slots[slot];
92 /* return an empty slot number (>= 0) found in the given bitmask @mask.
93 * @mask == -1 == 0xffffffff means: take any free slot up to 32
94 * when no slot is available, return the original @mask as is.
96 static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
97 struct module *module)
101 for (slot = 0; slot < SNDRV_CARDS; slot++) {
102 if (slot < 32 && !(mask & (1U << slot)))
104 if (!test_bit(slot, snd_cards_lock)) {
105 if (check(module, slot))
106 return slot; /* found */
109 return mask; /* unchanged */
112 /* the default release callback set in snd_device_initialize() below;
113 * this is just NOP for now, as almost all jobs are already done in
114 * dev_free callback of snd_device chain instead.
116 static void default_release(struct device *dev)
121 * snd_device_initialize - Initialize struct device for sound devices
122 * @dev: device to initialize
123 * @card: card to assign, optional
125 void snd_device_initialize(struct device *dev, struct snd_card *card)
127 device_initialize(dev);
129 dev->parent = &card->card_dev;
130 dev->class = sound_class;
131 dev->release = default_release;
133 EXPORT_SYMBOL_GPL(snd_device_initialize);
135 static int snd_card_do_free(struct snd_card *card);
136 static const struct attribute_group card_dev_attr_group;
138 static void release_card_device(struct device *dev)
140 snd_card_do_free(dev_to_snd_card(dev));
144 * snd_card_new - create and initialize a soundcard structure
145 * @parent: the parent device object
146 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
147 * @xid: card identification (ASCII string)
148 * @module: top level module for locking
149 * @extra_size: allocate this extra size after the main soundcard structure
150 * @card_ret: the pointer to store the created card instance
152 * Creates and initializes a soundcard structure.
154 * The function allocates snd_card instance via kzalloc with the given
155 * space for the driver to use freely. The allocated struct is stored
156 * in the given card_ret pointer.
158 * Return: Zero if successful or a negative error code.
160 int snd_card_new(struct device *parent, int idx, const char *xid,
161 struct module *module, int extra_size,
162 struct snd_card **card_ret)
164 struct snd_card *card;
167 if (snd_BUG_ON(!card_ret))
173 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
177 card->private_data = (char *)card + sizeof(struct snd_card);
179 strlcpy(card->id, xid, sizeof(card->id));
181 mutex_lock(&snd_card_mutex);
182 if (idx < 0) /* first check the matching module-name slot */
183 idx = get_slot_from_bitmask(idx, module_slot_match, module);
184 if (idx < 0) /* if not matched, assign an empty slot */
185 idx = get_slot_from_bitmask(idx, check_empty_slot, module);
188 else if (idx < snd_ecards_limit) {
189 if (test_bit(idx, snd_cards_lock))
190 err = -EBUSY; /* invalid */
191 } else if (idx >= SNDRV_CARDS)
194 mutex_unlock(&snd_card_mutex);
195 dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n",
196 idx, snd_ecards_limit - 1, err);
200 set_bit(idx, snd_cards_lock); /* lock it */
201 if (idx >= snd_ecards_limit)
202 snd_ecards_limit = idx + 1; /* increase the limit */
203 mutex_unlock(&snd_card_mutex);
206 card->module = module;
207 INIT_LIST_HEAD(&card->devices);
208 init_rwsem(&card->controls_rwsem);
209 rwlock_init(&card->ctl_files_rwlock);
210 INIT_LIST_HEAD(&card->controls);
211 INIT_LIST_HEAD(&card->ctl_files);
212 spin_lock_init(&card->files_lock);
213 INIT_LIST_HEAD(&card->files_list);
214 mutex_init(&card->memory_mutex);
216 init_waitqueue_head(&card->power_sleep);
218 init_waitqueue_head(&card->remove_sleep);
220 device_initialize(&card->card_dev);
221 card->card_dev.parent = parent;
222 card->card_dev.class = sound_class;
223 card->card_dev.release = release_card_device;
224 card->card_dev.groups = card->dev_groups;
225 card->dev_groups[0] = &card_dev_attr_group;
226 err = kobject_set_name(&card->card_dev.kobj, "card%d", idx);
230 snprintf(card->irq_descr, sizeof(card->irq_descr), "%s:%s",
231 dev_driver_string(card->dev), dev_name(&card->card_dev));
233 /* the control interface cannot be accessed from the user space until */
234 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
235 err = snd_ctl_create(card);
237 dev_err(parent, "unable to register control minors\n");
240 err = snd_info_card_create(card);
242 dev_err(parent, "unable to create card info\n");
249 snd_device_free_all(card);
251 put_device(&card->card_dev);
254 EXPORT_SYMBOL(snd_card_new);
257 * snd_card_ref - Get the card object from the index
258 * @idx: the card index
260 * Returns a card object corresponding to the given index or NULL if not found.
261 * Release the object via snd_card_unref().
263 struct snd_card *snd_card_ref(int idx)
265 struct snd_card *card;
267 mutex_lock(&snd_card_mutex);
268 card = snd_cards[idx];
270 get_device(&card->card_dev);
271 mutex_unlock(&snd_card_mutex);
274 EXPORT_SYMBOL_GPL(snd_card_ref);
276 /* return non-zero if a card is already locked */
277 int snd_card_locked(int card)
281 mutex_lock(&snd_card_mutex);
282 locked = test_bit(card, snd_cards_lock);
283 mutex_unlock(&snd_card_mutex);
287 static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
292 static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
293 size_t count, loff_t *offset)
298 static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
299 size_t count, loff_t *offset)
304 static int snd_disconnect_release(struct inode *inode, struct file *file)
306 struct snd_monitor_file *df = NULL, *_df;
308 spin_lock(&shutdown_lock);
309 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
310 if (_df->file == file) {
312 list_del_init(&df->shutdown_list);
316 spin_unlock(&shutdown_lock);
319 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
320 df->disconnected_f_op->fasync(-1, file, 0);
321 return df->disconnected_f_op->release(inode, file);
324 panic("%s(%p, %p) failed!", __func__, inode, file);
327 static __poll_t snd_disconnect_poll(struct file * file, poll_table * wait)
329 return EPOLLERR | EPOLLNVAL;
332 static long snd_disconnect_ioctl(struct file *file,
333 unsigned int cmd, unsigned long arg)
338 static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
343 static int snd_disconnect_fasync(int fd, struct file *file, int on)
348 static const struct file_operations snd_shutdown_f_ops =
350 .owner = THIS_MODULE,
351 .llseek = snd_disconnect_llseek,
352 .read = snd_disconnect_read,
353 .write = snd_disconnect_write,
354 .release = snd_disconnect_release,
355 .poll = snd_disconnect_poll,
356 .unlocked_ioctl = snd_disconnect_ioctl,
358 .compat_ioctl = snd_disconnect_ioctl,
360 .mmap = snd_disconnect_mmap,
361 .fasync = snd_disconnect_fasync
365 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
366 * @card: soundcard structure
368 * Disconnects all APIs from the file-operations (user space).
370 * Return: Zero, otherwise a negative error code.
372 * Note: The current implementation replaces all active file->f_op with special
373 * dummy file operations (they do nothing except release).
375 int snd_card_disconnect(struct snd_card *card)
377 struct snd_monitor_file *mfile;
382 spin_lock(&card->files_lock);
383 if (card->shutdown) {
384 spin_unlock(&card->files_lock);
389 /* replace file->f_op with special dummy operations */
390 list_for_each_entry(mfile, &card->files_list, list) {
391 /* it's critical part, use endless loop */
392 /* we have no room to fail */
393 mfile->disconnected_f_op = mfile->file->f_op;
395 spin_lock(&shutdown_lock);
396 list_add(&mfile->shutdown_list, &shutdown_files);
397 spin_unlock(&shutdown_lock);
399 mfile->file->f_op = &snd_shutdown_f_ops;
400 fops_get(mfile->file->f_op);
402 spin_unlock(&card->files_lock);
404 /* notify all connected devices about disconnection */
405 /* at this point, they cannot respond to any calls except release() */
407 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
408 if (snd_mixer_oss_notify_callback)
409 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
412 /* notify all devices that we are disconnected */
413 snd_device_disconnect_all(card);
415 snd_info_card_disconnect(card);
416 if (card->registered) {
417 device_del(&card->card_dev);
418 card->registered = false;
421 /* disable fops (user space) operations for ALSA API */
422 mutex_lock(&snd_card_mutex);
423 snd_cards[card->number] = NULL;
424 clear_bit(card->number, snd_cards_lock);
425 mutex_unlock(&snd_card_mutex);
428 wake_up(&card->power_sleep);
432 EXPORT_SYMBOL(snd_card_disconnect);
435 * snd_card_disconnect_sync - disconnect card and wait until files get closed
436 * @card: card object to disconnect
438 * This calls snd_card_disconnect() for disconnecting all belonging components
439 * and waits until all pending files get closed.
440 * It assures that all accesses from user-space finished so that the driver
441 * can release its resources gracefully.
443 void snd_card_disconnect_sync(struct snd_card *card)
447 err = snd_card_disconnect(card);
450 "snd_card_disconnect error (%d), skipping sync\n",
455 spin_lock_irq(&card->files_lock);
456 wait_event_lock_irq(card->remove_sleep,
457 list_empty(&card->files_list),
459 spin_unlock_irq(&card->files_lock);
461 EXPORT_SYMBOL_GPL(snd_card_disconnect_sync);
463 static int snd_card_do_free(struct snd_card *card)
465 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
466 if (snd_mixer_oss_notify_callback)
467 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
469 snd_device_free_all(card);
470 if (card->private_free)
471 card->private_free(card);
472 if (snd_info_card_free(card) < 0) {
473 dev_warn(card->dev, "unable to free card info\n");
474 /* Not fatal error */
476 if (card->release_completion)
477 complete(card->release_completion);
483 * snd_card_free_when_closed - Disconnect the card, free it later eventually
484 * @card: soundcard structure
486 * Unlike snd_card_free(), this function doesn't try to release the card
487 * resource immediately, but tries to disconnect at first. When the card
488 * is still in use, the function returns before freeing the resources.
489 * The card resources will be freed when the refcount gets to zero.
491 int snd_card_free_when_closed(struct snd_card *card)
493 int ret = snd_card_disconnect(card);
496 put_device(&card->card_dev);
499 EXPORT_SYMBOL(snd_card_free_when_closed);
502 * snd_card_free - frees given soundcard structure
503 * @card: soundcard structure
505 * This function releases the soundcard structure and the all assigned
506 * devices automatically. That is, you don't have to release the devices
509 * This function waits until the all resources are properly released.
511 * Return: Zero. Frees all associated devices and frees the control
512 * interface associated to given soundcard.
514 int snd_card_free(struct snd_card *card)
516 struct completion released;
519 init_completion(&released);
520 card->release_completion = &released;
521 ret = snd_card_free_when_closed(card);
524 /* wait, until all devices are ready for the free operation */
525 wait_for_completion(&released);
528 EXPORT_SYMBOL(snd_card_free);
530 /* retrieve the last word of shortname or longname */
531 static const char *retrieve_id_from_card_name(const char *name)
533 const char *spos = name;
536 if (isspace(*name) && isalnum(name[1]))
543 /* return true if the given id string doesn't conflict any other card ids */
544 static bool card_id_ok(struct snd_card *card, const char *id)
547 if (!snd_info_check_reserved_words(id))
549 for (i = 0; i < snd_ecards_limit; i++) {
550 if (snd_cards[i] && snd_cards[i] != card &&
551 !strcmp(snd_cards[i]->id, id))
557 /* copy to card->id only with valid letters from nid */
558 static void copy_valid_id_string(struct snd_card *card, const char *src,
563 while (*nid && !isalnum(*nid))
566 *id++ = isalpha(*src) ? *src : 'D';
567 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
575 /* Set card->id from the given string
576 * If the string conflicts with other ids, add a suffix to make it unique.
578 static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
582 bool is_default = false;
585 copy_valid_id_string(card, src, nid);
589 /* use "Default" for obviously invalid strings
590 * ("card" conflicts with proc directories)
592 if (!*id || !strncmp(id, "card", 4)) {
593 strcpy(id, "Default");
598 for (loops = 0; loops < SNDRV_CARDS; loops++) {
600 char sfxstr[5]; /* "_012" */
603 if (card_id_ok(card, id))
606 /* Add _XYZ suffix */
607 sprintf(sfxstr, "_%X", loops + 1);
608 sfxlen = strlen(sfxstr);
609 if (len + sfxlen >= sizeof(card->id))
610 spos = id + sizeof(card->id) - sfxlen - 1;
613 strcpy(spos, sfxstr);
615 /* fallback to the default id */
621 dev_err(card->dev, "unable to set card id (%s)\n", id);
622 if (card->proc_root->name)
623 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
627 * snd_card_set_id - set card identification name
628 * @card: soundcard structure
629 * @nid: new identification string
631 * This function sets the card identification and checks for name
634 void snd_card_set_id(struct snd_card *card, const char *nid)
636 /* check if user specified own card->id */
637 if (card->id[0] != '\0')
639 mutex_lock(&snd_card_mutex);
640 snd_card_set_id_no_lock(card, nid, nid);
641 mutex_unlock(&snd_card_mutex);
643 EXPORT_SYMBOL(snd_card_set_id);
646 card_id_show_attr(struct device *dev,
647 struct device_attribute *attr, char *buf)
649 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
650 return scnprintf(buf, PAGE_SIZE, "%s\n", card->id);
654 card_id_store_attr(struct device *dev, struct device_attribute *attr,
655 const char *buf, size_t count)
657 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
658 char buf1[sizeof(card->id)];
659 size_t copy = count > sizeof(card->id) - 1 ?
660 sizeof(card->id) - 1 : count;
664 for (idx = 0; idx < copy; idx++) {
666 if (!isalnum(c) && c != '_' && c != '-')
669 memcpy(buf1, buf, copy);
671 mutex_lock(&snd_card_mutex);
672 if (!card_id_ok(NULL, buf1)) {
673 mutex_unlock(&snd_card_mutex);
676 strcpy(card->id, buf1);
677 snd_info_card_id_change(card);
678 mutex_unlock(&snd_card_mutex);
683 static DEVICE_ATTR(id, 0644, card_id_show_attr, card_id_store_attr);
686 card_number_show_attr(struct device *dev,
687 struct device_attribute *attr, char *buf)
689 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
690 return scnprintf(buf, PAGE_SIZE, "%i\n", card->number);
693 static DEVICE_ATTR(number, 0444, card_number_show_attr, NULL);
695 static struct attribute *card_dev_attrs[] = {
697 &dev_attr_number.attr,
701 static const struct attribute_group card_dev_attr_group = {
702 .attrs = card_dev_attrs,
706 * snd_card_add_dev_attr - Append a new sysfs attribute group to card
707 * @card: card instance
708 * @group: attribute group to append
710 int snd_card_add_dev_attr(struct snd_card *card,
711 const struct attribute_group *group)
715 /* loop for (arraysize-1) here to keep NULL at the last entry */
716 for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) {
717 if (!card->dev_groups[i]) {
718 card->dev_groups[i] = group;
723 dev_err(card->dev, "Too many groups assigned\n");
726 EXPORT_SYMBOL_GPL(snd_card_add_dev_attr);
729 * snd_card_register - register the soundcard
730 * @card: soundcard structure
732 * This function registers all the devices assigned to the soundcard.
733 * Until calling this, the ALSA control interface is blocked from the
734 * external accesses. Thus, you should call this function at the end
735 * of the initialization of the card.
737 * Return: Zero otherwise a negative error code if the registration failed.
739 int snd_card_register(struct snd_card *card)
743 if (snd_BUG_ON(!card))
746 if (!card->registered) {
747 err = device_add(&card->card_dev);
750 card->registered = true;
753 if ((err = snd_device_register_all(card)) < 0)
755 mutex_lock(&snd_card_mutex);
756 if (snd_cards[card->number]) {
757 /* already registered */
758 mutex_unlock(&snd_card_mutex);
759 return snd_info_card_register(card); /* register pending info */
762 /* make a unique id name from the given string */
763 char tmpid[sizeof(card->id)];
764 memcpy(tmpid, card->id, sizeof(card->id));
765 snd_card_set_id_no_lock(card, tmpid, tmpid);
767 /* create an id from either shortname or longname */
769 src = *card->shortname ? card->shortname : card->longname;
770 snd_card_set_id_no_lock(card, src,
771 retrieve_id_from_card_name(src));
773 snd_cards[card->number] = card;
774 mutex_unlock(&snd_card_mutex);
775 err = snd_info_card_register(card);
779 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
780 if (snd_mixer_oss_notify_callback)
781 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
785 EXPORT_SYMBOL(snd_card_register);
787 #ifdef CONFIG_SND_PROC_FS
788 static void snd_card_info_read(struct snd_info_entry *entry,
789 struct snd_info_buffer *buffer)
792 struct snd_card *card;
794 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
795 mutex_lock(&snd_card_mutex);
796 if ((card = snd_cards[idx]) != NULL) {
798 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
803 snd_iprintf(buffer, " %s\n",
806 mutex_unlock(&snd_card_mutex);
809 snd_iprintf(buffer, "--- no soundcards ---\n");
812 #ifdef CONFIG_SND_OSSEMUL
813 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
816 struct snd_card *card;
818 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
819 mutex_lock(&snd_card_mutex);
820 if ((card = snd_cards[idx]) != NULL) {
822 snd_iprintf(buffer, "%s\n", card->longname);
824 mutex_unlock(&snd_card_mutex);
827 snd_iprintf(buffer, "--- no soundcards ---\n");
834 static void snd_card_module_info_read(struct snd_info_entry *entry,
835 struct snd_info_buffer *buffer)
838 struct snd_card *card;
840 for (idx = 0; idx < SNDRV_CARDS; idx++) {
841 mutex_lock(&snd_card_mutex);
842 if ((card = snd_cards[idx]) != NULL)
843 snd_iprintf(buffer, "%2i %s\n",
844 idx, card->module->name);
845 mutex_unlock(&snd_card_mutex);
850 int __init snd_card_info_init(void)
852 struct snd_info_entry *entry;
854 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
857 entry->c.text.read = snd_card_info_read;
858 if (snd_info_register(entry) < 0)
859 return -ENOMEM; /* freed in error path */
862 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
865 entry->c.text.read = snd_card_module_info_read;
866 if (snd_info_register(entry) < 0)
867 return -ENOMEM; /* freed in error path */
872 #endif /* CONFIG_SND_PROC_FS */
875 * snd_component_add - add a component string
876 * @card: soundcard structure
877 * @component: the component id string
879 * This function adds the component id string to the supported list.
880 * The component can be referred from the alsa-lib.
882 * Return: Zero otherwise a negative error code.
885 int snd_component_add(struct snd_card *card, const char *component)
888 int len = strlen(component);
890 ptr = strstr(card->components, component);
892 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
895 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
899 if (card->components[0] != '\0')
900 strcat(card->components, " ");
901 strcat(card->components, component);
904 EXPORT_SYMBOL(snd_component_add);
907 * snd_card_file_add - add the file to the file list of the card
908 * @card: soundcard structure
909 * @file: file pointer
911 * This function adds the file to the file linked-list of the card.
912 * This linked-list is used to keep tracking the connection state,
913 * and to avoid the release of busy resources by hotplug.
915 * Return: zero or a negative error code.
917 int snd_card_file_add(struct snd_card *card, struct file *file)
919 struct snd_monitor_file *mfile;
921 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
925 mfile->disconnected_f_op = NULL;
926 INIT_LIST_HEAD(&mfile->shutdown_list);
927 spin_lock(&card->files_lock);
928 if (card->shutdown) {
929 spin_unlock(&card->files_lock);
933 list_add(&mfile->list, &card->files_list);
934 get_device(&card->card_dev);
935 spin_unlock(&card->files_lock);
938 EXPORT_SYMBOL(snd_card_file_add);
941 * snd_card_file_remove - remove the file from the file list
942 * @card: soundcard structure
943 * @file: file pointer
945 * This function removes the file formerly added to the card via
946 * snd_card_file_add() function.
947 * If all files are removed and snd_card_free_when_closed() was
948 * called beforehand, it processes the pending release of
951 * Return: Zero or a negative error code.
953 int snd_card_file_remove(struct snd_card *card, struct file *file)
955 struct snd_monitor_file *mfile, *found = NULL;
957 spin_lock(&card->files_lock);
958 list_for_each_entry(mfile, &card->files_list, list) {
959 if (mfile->file == file) {
960 list_del(&mfile->list);
961 spin_lock(&shutdown_lock);
962 list_del(&mfile->shutdown_list);
963 spin_unlock(&shutdown_lock);
964 if (mfile->disconnected_f_op)
965 fops_put(mfile->disconnected_f_op);
970 if (list_empty(&card->files_list))
971 wake_up_all(&card->remove_sleep);
972 spin_unlock(&card->files_lock);
974 dev_err(card->dev, "card file remove problem (%p)\n", file);
978 put_device(&card->card_dev);
981 EXPORT_SYMBOL(snd_card_file_remove);
985 * snd_power_wait - wait until the power-state is changed.
986 * @card: soundcard structure
987 * @power_state: expected power state
989 * Waits until the power-state is changed.
991 * Return: Zero if successful, or a negative error code.
993 int snd_power_wait(struct snd_card *card, unsigned int power_state)
995 wait_queue_entry_t wait;
999 if (snd_power_get_state(card) == power_state)
1001 init_waitqueue_entry(&wait, current);
1002 add_wait_queue(&card->power_sleep, &wait);
1004 if (card->shutdown) {
1008 if (snd_power_get_state(card) == power_state)
1010 set_current_state(TASK_UNINTERRUPTIBLE);
1011 schedule_timeout(30 * HZ);
1013 remove_wait_queue(&card->power_sleep, &wait);
1016 EXPORT_SYMBOL(snd_power_wait);
1017 #endif /* CONFIG_PM */