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Diffstat (limited to 'sound/core/init.c')
-rw-r--r--sound/core/init.c89
1 files changed, 46 insertions, 43 deletions
diff --git a/sound/core/init.c b/sound/core/init.c
index 0d5520c415d..fd56afe846e 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -121,31 +121,44 @@ static inline int init_info_for_card(struct snd_card *card)
#endif
/**
- * snd_card_new - create and initialize a soundcard structure
+ * snd_card_create - create and initialize a soundcard structure
* @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
* @xid: card identification (ASCII string)
* @module: top level module for locking
* @extra_size: allocate this extra size after the main soundcard structure
+ * @card_ret: the pointer to store the created card instance
*
* Creates and initializes a soundcard structure.
*
- * Returns kmallocated snd_card structure. Creates the ALSA control interface
- * (which is blocked until snd_card_register function is called).
+ * The function allocates snd_card instance via kzalloc with the given
+ * space for the driver to use freely. The allocated struct is stored
+ * in the given card_ret pointer.
+ *
+ * Returns zero if successful or a negative error code.
*/
-struct snd_card *snd_card_new(int idx, const char *xid,
- struct module *module, int extra_size)
+int snd_card_create(int idx, const char *xid,
+ struct module *module, int extra_size,
+ struct snd_card **card_ret)
{
struct snd_card *card;
int err, idx2;
+ if (snd_BUG_ON(!card_ret))
+ return -EINVAL;
+ *card_ret = NULL;
+
if (extra_size < 0)
extra_size = 0;
card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
- if (card == NULL)
- return NULL;
+ if (!card)
+ return -ENOMEM;
if (xid) {
- if (!snd_info_check_reserved_words(xid))
+ if (!snd_info_check_reserved_words(xid)) {
+ snd_printk(KERN_ERR
+ "given id string '%s' is reserved.\n", xid);
+ err = -EBUSY;
goto __error;
+ }
strlcpy(card->id, xid, sizeof(card->id));
}
err = 0;
@@ -195,6 +208,7 @@ struct snd_card *snd_card_new(int idx, const char *xid,
INIT_LIST_HEAD(&card->controls);
INIT_LIST_HEAD(&card->ctl_files);
spin_lock_init(&card->files_lock);
+ INIT_LIST_HEAD(&card->files_list);
init_waitqueue_head(&card->shutdown_sleep);
#ifdef CONFIG_PM
mutex_init(&card->power_lock);
@@ -202,26 +216,28 @@ struct snd_card *snd_card_new(int idx, const char *xid,
#endif
/* the control interface cannot be accessed from the user space until */
/* snd_cards_bitmask and snd_cards are set with snd_card_register */
- if ((err = snd_ctl_create(card)) < 0) {
- snd_printd("unable to register control minors\n");
+ err = snd_ctl_create(card);
+ if (err < 0) {
+ snd_printk(KERN_ERR "unable to register control minors\n");
goto __error;
}
- if ((err = snd_info_card_create(card)) < 0) {
- snd_printd("unable to create card info\n");
+ err = snd_info_card_create(card);
+ if (err < 0) {
+ snd_printk(KERN_ERR "unable to create card info\n");
goto __error_ctl;
}
if (extra_size > 0)
card->private_data = (char *)card + sizeof(struct snd_card);
- return card;
+ *card_ret = card;
+ return 0;
__error_ctl:
snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
__error:
kfree(card);
- return NULL;
+ return err;
}
-
-EXPORT_SYMBOL(snd_card_new);
+EXPORT_SYMBOL(snd_card_create);
/* return non-zero if a card is already locked */
int snd_card_locked(int card)
@@ -259,6 +275,7 @@ static int snd_disconnect_release(struct inode *inode, struct file *file)
list_for_each_entry(_df, &shutdown_files, shutdown_list) {
if (_df->file == file) {
df = _df;
+ list_del_init(&df->shutdown_list);
break;
}
}
@@ -347,8 +364,7 @@ int snd_card_disconnect(struct snd_card *card)
/* phase 2: replace file->f_op with special dummy operations */
spin_lock(&card->files_lock);
- mfile = card->files;
- while (mfile) {
+ list_for_each_entry(mfile, &card->files_list, list) {
file = mfile->file;
/* it's critical part, use endless loop */
@@ -361,8 +377,6 @@ int snd_card_disconnect(struct snd_card *card)
mfile->file->f_op = &snd_shutdown_f_ops;
fops_get(mfile->file->f_op);
-
- mfile = mfile->next;
}
spin_unlock(&card->files_lock);
@@ -442,7 +456,7 @@ int snd_card_free_when_closed(struct snd_card *card)
return ret;
spin_lock(&card->files_lock);
- if (card->files == NULL)
+ if (list_empty(&card->files_list))
free_now = 1;
else
card->free_on_last_close = 1;
@@ -462,7 +476,7 @@ int snd_card_free(struct snd_card *card)
return ret;
/* wait, until all devices are ready for the free operation */
- wait_event(card->shutdown_sleep, card->files == NULL);
+ wait_event(card->shutdown_sleep, list_empty(&card->files_list));
snd_card_do_free(card);
return 0;
}
@@ -809,15 +823,13 @@ int snd_card_file_add(struct snd_card *card, struct file *file)
return -ENOMEM;
mfile->file = file;
mfile->disconnected_f_op = NULL;
- mfile->next = NULL;
spin_lock(&card->files_lock);
if (card->shutdown) {
spin_unlock(&card->files_lock);
kfree(mfile);
return -ENODEV;
}
- mfile->next = card->files;
- card->files = mfile;
+ list_add(&mfile->list, &card->files_list);
spin_unlock(&card->files_lock);
return 0;
}
@@ -839,29 +851,20 @@ EXPORT_SYMBOL(snd_card_file_add);
*/
int snd_card_file_remove(struct snd_card *card, struct file *file)
{
- struct snd_monitor_file *mfile, *pfile = NULL;
+ struct snd_monitor_file *mfile, *found = NULL;
int last_close = 0;
spin_lock(&card->files_lock);
- mfile = card->files;
- while (mfile) {
+ list_for_each_entry(mfile, &card->files_list, list) {
if (mfile->file == file) {
- if (pfile)
- pfile->next = mfile->next;
- else
- card->files = mfile->next;
+ list_del(&mfile->list);
+ if (mfile->disconnected_f_op)
+ fops_put(mfile->disconnected_f_op);
+ found = mfile;
break;
}
- pfile = mfile;
- mfile = mfile->next;
- }
- if (mfile && mfile->disconnected_f_op) {
- fops_put(mfile->disconnected_f_op);
- spin_lock(&shutdown_lock);
- list_del(&mfile->shutdown_list);
- spin_unlock(&shutdown_lock);
}
- if (card->files == NULL)
+ if (list_empty(&card->files_list))
last_close = 1;
spin_unlock(&card->files_lock);
if (last_close) {
@@ -869,11 +872,11 @@ int snd_card_file_remove(struct snd_card *card, struct file *file)
if (card->free_on_last_close)
snd_card_do_free(card);
}
- if (!mfile) {
+ if (!found) {
snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
return -ENOENT;
}
- kfree(mfile);
+ kfree(found);
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 13:17:19 +0000