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>
17 #include <linux/interrupt.h>
19 #include <sound/core.h>
20 #include <sound/control.h>
21 #include <sound/info.h>
23 /* monitor files for graceful shutdown (hotplug) */
24 struct snd_monitor_file {
26 const struct file_operations *disconnected_f_op;
27 struct list_head shutdown_list; /* still need to shutdown */
28 struct list_head list; /* link of monitor files */
31 static DEFINE_SPINLOCK(shutdown_lock);
32 static LIST_HEAD(shutdown_files);
34 static const struct file_operations snd_shutdown_f_ops;
36 /* locked for registering/using */
37 static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS);
38 static struct snd_card *snd_cards[SNDRV_CARDS];
40 static DEFINE_MUTEX(snd_card_mutex);
42 static char *slots[SNDRV_CARDS];
43 module_param_array(slots, charp, NULL, 0444);
44 MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
46 /* return non-zero if the given index is reserved for the given
47 * module via slots option
49 static int module_slot_match(struct module *module, int idx)
55 if (!module || !*module->name || !slots[idx])
61 match = 0; /* negative match */
64 /* compare module name strings
65 * hyphens are handled as equivalent with underscore
83 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
84 int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
85 EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
88 static int check_empty_slot(struct module *module, int slot)
90 return !slots[slot] || !*slots[slot];
93 /* return an empty slot number (>= 0) found in the given bitmask @mask.
94 * @mask == -1 == 0xffffffff means: take any free slot up to 32
95 * when no slot is available, return the original @mask as is.
97 static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
98 struct module *module)
102 for (slot = 0; slot < SNDRV_CARDS; slot++) {
103 if (slot < 32 && !(mask & (1U << slot)))
105 if (!test_bit(slot, snd_cards_lock)) {
106 if (check(module, slot))
107 return slot; /* found */
110 return mask; /* unchanged */
113 /* the default release callback set in snd_device_initialize() below;
114 * this is just NOP for now, as almost all jobs are already done in
115 * dev_free callback of snd_device chain instead.
117 static void default_release(struct device *dev)
122 * snd_device_initialize - Initialize struct device for sound devices
123 * @dev: device to initialize
124 * @card: card to assign, optional
126 void snd_device_initialize(struct device *dev, struct snd_card *card)
128 device_initialize(dev);
130 dev->parent = &card->card_dev;
131 dev->class = sound_class;
132 dev->release = default_release;
134 EXPORT_SYMBOL_GPL(snd_device_initialize);
136 static int snd_card_do_free(struct snd_card *card);
137 static const struct attribute_group card_dev_attr_group;
139 static void release_card_device(struct device *dev)
141 snd_card_do_free(dev_to_snd_card(dev));
145 * snd_card_new - create and initialize a soundcard structure
146 * @parent: the parent device object
147 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
148 * @xid: card identification (ASCII string)
149 * @module: top level module for locking
150 * @extra_size: allocate this extra size after the main soundcard structure
151 * @card_ret: the pointer to store the created card instance
153 * Creates and initializes a soundcard structure.
155 * The function allocates snd_card instance via kzalloc with the given
156 * space for the driver to use freely. The allocated struct is stored
157 * in the given card_ret pointer.
159 * Return: Zero if successful or a negative error code.
161 int snd_card_new(struct device *parent, int idx, const char *xid,
162 struct module *module, int extra_size,
163 struct snd_card **card_ret)
165 struct snd_card *card;
168 if (snd_BUG_ON(!card_ret))
174 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
178 card->private_data = (char *)card + sizeof(struct snd_card);
180 strlcpy(card->id, xid, sizeof(card->id));
182 mutex_lock(&snd_card_mutex);
183 if (idx < 0) /* first check the matching module-name slot */
184 idx = get_slot_from_bitmask(idx, module_slot_match, module);
185 if (idx < 0) /* if not matched, assign an empty slot */
186 idx = get_slot_from_bitmask(idx, check_empty_slot, module);
189 else if (idx < snd_ecards_limit) {
190 if (test_bit(idx, snd_cards_lock))
191 err = -EBUSY; /* invalid */
192 } else if (idx >= SNDRV_CARDS)
195 mutex_unlock(&snd_card_mutex);
196 dev_err(parent, "cannot find the slot for index %d (range 0-%i), error: %d\n",
197 idx, snd_ecards_limit - 1, err);
201 set_bit(idx, snd_cards_lock); /* lock it */
202 if (idx >= snd_ecards_limit)
203 snd_ecards_limit = idx + 1; /* increase the limit */
204 mutex_unlock(&snd_card_mutex);
209 card->module = module;
211 INIT_LIST_HEAD(&card->devices);
212 init_rwsem(&card->controls_rwsem);
213 rwlock_init(&card->ctl_files_rwlock);
214 INIT_LIST_HEAD(&card->controls);
215 INIT_LIST_HEAD(&card->ctl_files);
216 spin_lock_init(&card->files_lock);
217 INIT_LIST_HEAD(&card->files_list);
218 mutex_init(&card->memory_mutex);
220 init_waitqueue_head(&card->power_sleep);
222 init_waitqueue_head(&card->remove_sleep);
225 device_initialize(&card->card_dev);
226 card->card_dev.parent = parent;
227 card->card_dev.class = sound_class;
228 card->card_dev.release = release_card_device;
229 card->card_dev.groups = card->dev_groups;
230 card->dev_groups[0] = &card_dev_attr_group;
231 err = kobject_set_name(&card->card_dev.kobj, "card%d", idx);
235 snprintf(card->irq_descr, sizeof(card->irq_descr), "%s:%s",
236 dev_driver_string(card->dev), dev_name(&card->card_dev));
238 /* the control interface cannot be accessed from the user space until */
239 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
240 err = snd_ctl_create(card);
242 dev_err(parent, "unable to register control minors\n");
245 err = snd_info_card_create(card);
247 dev_err(parent, "unable to create card info\n");
254 snd_device_free_all(card);
256 put_device(&card->card_dev);
259 EXPORT_SYMBOL(snd_card_new);
262 * snd_card_ref - Get the card object from the index
263 * @idx: the card index
265 * Returns a card object corresponding to the given index or NULL if not found.
266 * Release the object via snd_card_unref().
268 struct snd_card *snd_card_ref(int idx)
270 struct snd_card *card;
272 mutex_lock(&snd_card_mutex);
273 card = snd_cards[idx];
275 get_device(&card->card_dev);
276 mutex_unlock(&snd_card_mutex);
279 EXPORT_SYMBOL_GPL(snd_card_ref);
281 /* return non-zero if a card is already locked */
282 int snd_card_locked(int card)
286 mutex_lock(&snd_card_mutex);
287 locked = test_bit(card, snd_cards_lock);
288 mutex_unlock(&snd_card_mutex);
292 static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
297 static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
298 size_t count, loff_t *offset)
303 static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
304 size_t count, loff_t *offset)
309 static int snd_disconnect_release(struct inode *inode, struct file *file)
311 struct snd_monitor_file *df = NULL, *_df;
313 spin_lock(&shutdown_lock);
314 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
315 if (_df->file == file) {
317 list_del_init(&df->shutdown_list);
321 spin_unlock(&shutdown_lock);
324 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
325 df->disconnected_f_op->fasync(-1, file, 0);
326 return df->disconnected_f_op->release(inode, file);
329 panic("%s(%p, %p) failed!", __func__, inode, file);
332 static __poll_t snd_disconnect_poll(struct file * file, poll_table * wait)
334 return EPOLLERR | EPOLLNVAL;
337 static long snd_disconnect_ioctl(struct file *file,
338 unsigned int cmd, unsigned long arg)
343 static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
348 static int snd_disconnect_fasync(int fd, struct file *file, int on)
353 static const struct file_operations snd_shutdown_f_ops =
355 .owner = THIS_MODULE,
356 .llseek = snd_disconnect_llseek,
357 .read = snd_disconnect_read,
358 .write = snd_disconnect_write,
359 .release = snd_disconnect_release,
360 .poll = snd_disconnect_poll,
361 .unlocked_ioctl = snd_disconnect_ioctl,
363 .compat_ioctl = snd_disconnect_ioctl,
365 .mmap = snd_disconnect_mmap,
366 .fasync = snd_disconnect_fasync
370 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
371 * @card: soundcard structure
373 * Disconnects all APIs from the file-operations (user space).
375 * Return: Zero, otherwise a negative error code.
377 * Note: The current implementation replaces all active file->f_op with special
378 * dummy file operations (they do nothing except release).
380 int snd_card_disconnect(struct snd_card *card)
382 struct snd_monitor_file *mfile;
387 spin_lock(&card->files_lock);
388 if (card->shutdown) {
389 spin_unlock(&card->files_lock);
394 /* replace file->f_op with special dummy operations */
395 list_for_each_entry(mfile, &card->files_list, list) {
396 /* it's critical part, use endless loop */
397 /* we have no room to fail */
398 mfile->disconnected_f_op = mfile->file->f_op;
400 spin_lock(&shutdown_lock);
401 list_add(&mfile->shutdown_list, &shutdown_files);
402 spin_unlock(&shutdown_lock);
404 mfile->file->f_op = &snd_shutdown_f_ops;
405 fops_get(mfile->file->f_op);
407 spin_unlock(&card->files_lock);
409 /* notify all connected devices about disconnection */
410 /* at this point, they cannot respond to any calls except release() */
412 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
413 if (snd_mixer_oss_notify_callback)
414 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
417 /* notify all devices that we are disconnected */
418 snd_device_disconnect_all(card);
420 if (card->sync_irq > 0)
421 synchronize_irq(card->sync_irq);
423 snd_info_card_disconnect(card);
424 if (card->registered) {
425 device_del(&card->card_dev);
426 card->registered = false;
429 /* disable fops (user space) operations for ALSA API */
430 mutex_lock(&snd_card_mutex);
431 snd_cards[card->number] = NULL;
432 clear_bit(card->number, snd_cards_lock);
433 mutex_unlock(&snd_card_mutex);
436 wake_up(&card->power_sleep);
440 EXPORT_SYMBOL(snd_card_disconnect);
443 * snd_card_disconnect_sync - disconnect card and wait until files get closed
444 * @card: card object to disconnect
446 * This calls snd_card_disconnect() for disconnecting all belonging components
447 * and waits until all pending files get closed.
448 * It assures that all accesses from user-space finished so that the driver
449 * can release its resources gracefully.
451 void snd_card_disconnect_sync(struct snd_card *card)
455 err = snd_card_disconnect(card);
458 "snd_card_disconnect error (%d), skipping sync\n",
463 spin_lock_irq(&card->files_lock);
464 wait_event_lock_irq(card->remove_sleep,
465 list_empty(&card->files_list),
467 spin_unlock_irq(&card->files_lock);
469 EXPORT_SYMBOL_GPL(snd_card_disconnect_sync);
471 static int snd_card_do_free(struct snd_card *card)
473 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
474 if (snd_mixer_oss_notify_callback)
475 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
477 snd_device_free_all(card);
478 if (card->private_free)
479 card->private_free(card);
480 if (snd_info_card_free(card) < 0) {
481 dev_warn(card->dev, "unable to free card info\n");
482 /* Not fatal error */
484 if (card->release_completion)
485 complete(card->release_completion);
491 * snd_card_free_when_closed - Disconnect the card, free it later eventually
492 * @card: soundcard structure
494 * Unlike snd_card_free(), this function doesn't try to release the card
495 * resource immediately, but tries to disconnect at first. When the card
496 * is still in use, the function returns before freeing the resources.
497 * The card resources will be freed when the refcount gets to zero.
499 int snd_card_free_when_closed(struct snd_card *card)
501 int ret = snd_card_disconnect(card);
504 put_device(&card->card_dev);
507 EXPORT_SYMBOL(snd_card_free_when_closed);
510 * snd_card_free - frees given soundcard structure
511 * @card: soundcard structure
513 * This function releases the soundcard structure and the all assigned
514 * devices automatically. That is, you don't have to release the devices
517 * This function waits until the all resources are properly released.
519 * Return: Zero. Frees all associated devices and frees the control
520 * interface associated to given soundcard.
522 int snd_card_free(struct snd_card *card)
524 DECLARE_COMPLETION_ONSTACK(released);
527 card->release_completion = &released;
528 ret = snd_card_free_when_closed(card);
531 /* wait, until all devices are ready for the free operation */
532 wait_for_completion(&released);
535 EXPORT_SYMBOL(snd_card_free);
537 /* retrieve the last word of shortname or longname */
538 static const char *retrieve_id_from_card_name(const char *name)
540 const char *spos = name;
543 if (isspace(*name) && isalnum(name[1]))
550 /* return true if the given id string doesn't conflict any other card ids */
551 static bool card_id_ok(struct snd_card *card, const char *id)
554 if (!snd_info_check_reserved_words(id))
556 for (i = 0; i < snd_ecards_limit; i++) {
557 if (snd_cards[i] && snd_cards[i] != card &&
558 !strcmp(snd_cards[i]->id, id))
564 /* copy to card->id only with valid letters from nid */
565 static void copy_valid_id_string(struct snd_card *card, const char *src,
570 while (*nid && !isalnum(*nid))
573 *id++ = isalpha(*src) ? *src : 'D';
574 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
582 /* Set card->id from the given string
583 * If the string conflicts with other ids, add a suffix to make it unique.
585 static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
589 bool is_default = false;
592 copy_valid_id_string(card, src, nid);
596 /* use "Default" for obviously invalid strings
597 * ("card" conflicts with proc directories)
599 if (!*id || !strncmp(id, "card", 4)) {
600 strcpy(id, "Default");
605 for (loops = 0; loops < SNDRV_CARDS; loops++) {
607 char sfxstr[5]; /* "_012" */
610 if (card_id_ok(card, id))
613 /* Add _XYZ suffix */
614 sprintf(sfxstr, "_%X", loops + 1);
615 sfxlen = strlen(sfxstr);
616 if (len + sfxlen >= sizeof(card->id))
617 spos = id + sizeof(card->id) - sfxlen - 1;
620 strcpy(spos, sfxstr);
622 /* fallback to the default id */
628 dev_err(card->dev, "unable to set card id (%s)\n", id);
629 if (card->proc_root->name)
630 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
634 * snd_card_set_id - set card identification name
635 * @card: soundcard structure
636 * @nid: new identification string
638 * This function sets the card identification and checks for name
641 void snd_card_set_id(struct snd_card *card, const char *nid)
643 /* check if user specified own card->id */
644 if (card->id[0] != '\0')
646 mutex_lock(&snd_card_mutex);
647 snd_card_set_id_no_lock(card, nid, nid);
648 mutex_unlock(&snd_card_mutex);
650 EXPORT_SYMBOL(snd_card_set_id);
653 card_id_show_attr(struct device *dev,
654 struct device_attribute *attr, char *buf)
656 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
657 return scnprintf(buf, PAGE_SIZE, "%s\n", card->id);
661 card_id_store_attr(struct device *dev, struct device_attribute *attr,
662 const char *buf, size_t count)
664 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
665 char buf1[sizeof(card->id)];
666 size_t copy = count > sizeof(card->id) - 1 ?
667 sizeof(card->id) - 1 : count;
671 for (idx = 0; idx < copy; idx++) {
673 if (!isalnum(c) && c != '_' && c != '-')
676 memcpy(buf1, buf, copy);
678 mutex_lock(&snd_card_mutex);
679 if (!card_id_ok(NULL, buf1)) {
680 mutex_unlock(&snd_card_mutex);
683 strcpy(card->id, buf1);
684 snd_info_card_id_change(card);
685 mutex_unlock(&snd_card_mutex);
690 static DEVICE_ATTR(id, 0644, card_id_show_attr, card_id_store_attr);
693 card_number_show_attr(struct device *dev,
694 struct device_attribute *attr, char *buf)
696 struct snd_card *card = container_of(dev, struct snd_card, card_dev);
697 return scnprintf(buf, PAGE_SIZE, "%i\n", card->number);
700 static DEVICE_ATTR(number, 0444, card_number_show_attr, NULL);
702 static struct attribute *card_dev_attrs[] = {
704 &dev_attr_number.attr,
708 static const struct attribute_group card_dev_attr_group = {
709 .attrs = card_dev_attrs,
713 * snd_card_add_dev_attr - Append a new sysfs attribute group to card
714 * @card: card instance
715 * @group: attribute group to append
717 int snd_card_add_dev_attr(struct snd_card *card,
718 const struct attribute_group *group)
722 /* loop for (arraysize-1) here to keep NULL at the last entry */
723 for (i = 0; i < ARRAY_SIZE(card->dev_groups) - 1; i++) {
724 if (!card->dev_groups[i]) {
725 card->dev_groups[i] = group;
730 dev_err(card->dev, "Too many groups assigned\n");
733 EXPORT_SYMBOL_GPL(snd_card_add_dev_attr);
736 * snd_card_register - register the soundcard
737 * @card: soundcard structure
739 * This function registers all the devices assigned to the soundcard.
740 * Until calling this, the ALSA control interface is blocked from the
741 * external accesses. Thus, you should call this function at the end
742 * of the initialization of the card.
744 * Return: Zero otherwise a negative error code if the registration failed.
746 int snd_card_register(struct snd_card *card)
750 if (snd_BUG_ON(!card))
753 if (!card->registered) {
754 err = device_add(&card->card_dev);
757 card->registered = true;
760 if ((err = snd_device_register_all(card)) < 0)
762 mutex_lock(&snd_card_mutex);
763 if (snd_cards[card->number]) {
764 /* already registered */
765 mutex_unlock(&snd_card_mutex);
766 return snd_info_card_register(card); /* register pending info */
769 /* make a unique id name from the given string */
770 char tmpid[sizeof(card->id)];
771 memcpy(tmpid, card->id, sizeof(card->id));
772 snd_card_set_id_no_lock(card, tmpid, tmpid);
774 /* create an id from either shortname or longname */
776 src = *card->shortname ? card->shortname : card->longname;
777 snd_card_set_id_no_lock(card, src,
778 retrieve_id_from_card_name(src));
780 snd_cards[card->number] = card;
781 mutex_unlock(&snd_card_mutex);
782 err = snd_info_card_register(card);
786 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
787 if (snd_mixer_oss_notify_callback)
788 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
792 EXPORT_SYMBOL(snd_card_register);
794 #ifdef CONFIG_SND_PROC_FS
795 static void snd_card_info_read(struct snd_info_entry *entry,
796 struct snd_info_buffer *buffer)
799 struct snd_card *card;
801 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
802 mutex_lock(&snd_card_mutex);
803 if ((card = snd_cards[idx]) != NULL) {
805 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
810 snd_iprintf(buffer, " %s\n",
813 mutex_unlock(&snd_card_mutex);
816 snd_iprintf(buffer, "--- no soundcards ---\n");
819 #ifdef CONFIG_SND_OSSEMUL
820 void snd_card_info_read_oss(struct snd_info_buffer *buffer)
823 struct snd_card *card;
825 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
826 mutex_lock(&snd_card_mutex);
827 if ((card = snd_cards[idx]) != NULL) {
829 snd_iprintf(buffer, "%s\n", card->longname);
831 mutex_unlock(&snd_card_mutex);
834 snd_iprintf(buffer, "--- no soundcards ---\n");
841 static void snd_card_module_info_read(struct snd_info_entry *entry,
842 struct snd_info_buffer *buffer)
845 struct snd_card *card;
847 for (idx = 0; idx < SNDRV_CARDS; idx++) {
848 mutex_lock(&snd_card_mutex);
849 if ((card = snd_cards[idx]) != NULL)
850 snd_iprintf(buffer, "%2i %s\n",
851 idx, card->module->name);
852 mutex_unlock(&snd_card_mutex);
857 int __init snd_card_info_init(void)
859 struct snd_info_entry *entry;
861 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
864 entry->c.text.read = snd_card_info_read;
865 if (snd_info_register(entry) < 0)
866 return -ENOMEM; /* freed in error path */
869 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
872 entry->c.text.read = snd_card_module_info_read;
873 if (snd_info_register(entry) < 0)
874 return -ENOMEM; /* freed in error path */
879 #endif /* CONFIG_SND_PROC_FS */
882 * snd_component_add - add a component string
883 * @card: soundcard structure
884 * @component: the component id string
886 * This function adds the component id string to the supported list.
887 * The component can be referred from the alsa-lib.
889 * Return: Zero otherwise a negative error code.
892 int snd_component_add(struct snd_card *card, const char *component)
895 int len = strlen(component);
897 ptr = strstr(card->components, component);
899 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
902 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
906 if (card->components[0] != '\0')
907 strcat(card->components, " ");
908 strcat(card->components, component);
911 EXPORT_SYMBOL(snd_component_add);
914 * snd_card_file_add - add the file to the file list of the card
915 * @card: soundcard structure
916 * @file: file pointer
918 * This function adds the file to the file linked-list of the card.
919 * This linked-list is used to keep tracking the connection state,
920 * and to avoid the release of busy resources by hotplug.
922 * Return: zero or a negative error code.
924 int snd_card_file_add(struct snd_card *card, struct file *file)
926 struct snd_monitor_file *mfile;
928 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
932 mfile->disconnected_f_op = NULL;
933 INIT_LIST_HEAD(&mfile->shutdown_list);
934 spin_lock(&card->files_lock);
935 if (card->shutdown) {
936 spin_unlock(&card->files_lock);
940 list_add(&mfile->list, &card->files_list);
941 get_device(&card->card_dev);
942 spin_unlock(&card->files_lock);
945 EXPORT_SYMBOL(snd_card_file_add);
948 * snd_card_file_remove - remove the file from the file list
949 * @card: soundcard structure
950 * @file: file pointer
952 * This function removes the file formerly added to the card via
953 * snd_card_file_add() function.
954 * If all files are removed and snd_card_free_when_closed() was
955 * called beforehand, it processes the pending release of
958 * Return: Zero or a negative error code.
960 int snd_card_file_remove(struct snd_card *card, struct file *file)
962 struct snd_monitor_file *mfile, *found = NULL;
964 spin_lock(&card->files_lock);
965 list_for_each_entry(mfile, &card->files_list, list) {
966 if (mfile->file == file) {
967 list_del(&mfile->list);
968 spin_lock(&shutdown_lock);
969 list_del(&mfile->shutdown_list);
970 spin_unlock(&shutdown_lock);
971 if (mfile->disconnected_f_op)
972 fops_put(mfile->disconnected_f_op);
977 if (list_empty(&card->files_list))
978 wake_up_all(&card->remove_sleep);
979 spin_unlock(&card->files_lock);
981 dev_err(card->dev, "card file remove problem (%p)\n", file);
985 put_device(&card->card_dev);
988 EXPORT_SYMBOL(snd_card_file_remove);
992 * snd_power_wait - wait until the power-state is changed.
993 * @card: soundcard structure
994 * @power_state: expected power state
996 * Waits until the power-state is changed.
998 * Return: Zero if successful, or a negative error code.
1000 int snd_power_wait(struct snd_card *card, unsigned int power_state)
1002 wait_queue_entry_t wait;
1006 if (snd_power_get_state(card) == power_state)
1008 init_waitqueue_entry(&wait, current);
1009 add_wait_queue(&card->power_sleep, &wait);
1011 if (card->shutdown) {
1015 if (snd_power_get_state(card) == power_state)
1017 set_current_state(TASK_UNINTERRUPTIBLE);
1018 schedule_timeout(30 * HZ);
1020 remove_wait_queue(&card->power_sleep, &wait);
1023 EXPORT_SYMBOL(snd_power_wait);
1024 #endif /* CONFIG_PM */