X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=sound%2Fcore%2Finit.c;fp=sound%2Fcore%2Finit.c;h=4d9258884e444c368be86da0c470a69726f2253d;hb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;hp=39ed2e5bb0af1b4a5c4320d7f14300f08bc40b8e;hpb=4e76c8a9fa413ccc09d3f7f664183dcce3555d57;p=linux-2.6.git

diff --git a/sound/core/init.c b/sound/core/init.c
index 39ed2e5bb..4d9258884 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -38,12 +38,15 @@ struct snd_shutdown_f_ops {
 	struct snd_shutdown_f_ops *next;
 };
 
-unsigned int snd_cards_lock = 0;	/* locked for registering/using */
-struct snd_card *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL};
-DEFINE_RWLOCK(snd_card_rwlock);
+static unsigned int snd_cards_lock;	/* locked for registering/using */
+struct snd_card *snd_cards[SNDRV_CARDS];
+EXPORT_SYMBOL(snd_cards);
+
+static DEFINE_MUTEX(snd_card_mutex);
 
 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
 int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
+EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
 #endif
 
 #ifdef CONFIG_PROC_FS
@@ -66,7 +69,6 @@ static inline int init_info_for_card(struct snd_card *card)
 		snd_printd("unable to create card entry\n");
 		return err;
 	}
-	entry->c.text.read_size = PAGE_SIZE;
 	entry->c.text.read = snd_card_id_read;
 	if (snd_info_register(entry) < 0) {
 		snd_info_free_entry(entry);
@@ -110,7 +112,7 @@ struct snd_card *snd_card_new(int idx, const char *xid,
 		strlcpy(card->id, xid, sizeof(card->id));
 	}
 	err = 0;
-	write_lock(&snd_card_rwlock);
+	mutex_lock(&snd_card_mutex);
 	if (idx < 0) {
 		int idx2;
 		for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
@@ -128,12 +130,12 @@ struct snd_card *snd_card_new(int idx, const char *xid,
 	else
 		err = -ENODEV;
 	if (idx < 0 || err < 0) {
-		write_unlock(&snd_card_rwlock);
+		mutex_unlock(&snd_card_mutex);
 		snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1);
 		goto __error;
 	}
 	snd_cards_lock |= 1 << idx;		/* lock it */
-	write_unlock(&snd_card_rwlock);
+	mutex_unlock(&snd_card_mutex);
 	card->number = idx;
 	card->module = module;
 	INIT_LIST_HEAD(&card->devices);
@@ -169,6 +171,19 @@ struct snd_card *snd_card_new(int idx, const char *xid,
       	return NULL;
 }
 
+EXPORT_SYMBOL(snd_card_new);
+
+/* return non-zero if a card is already locked */
+int snd_card_locked(int card)
+{
+	int locked;
+
+	mutex_lock(&snd_card_mutex);
+	locked = snd_cards_lock & (1 << card);
+	mutex_unlock(&snd_card_mutex);
+	return locked;
+}
+
 static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
 {
 	return -ENODEV;
@@ -236,9 +251,9 @@ int snd_card_disconnect(struct snd_card *card)
 	spin_unlock(&card->files_lock);
 
 	/* phase 1: disable fops (user space) operations for ALSA API */
-	write_lock(&snd_card_rwlock);
+	mutex_lock(&snd_card_mutex);
 	snd_cards[card->number] = NULL;
-	write_unlock(&snd_card_rwlock);
+	mutex_unlock(&snd_card_mutex);
 	
 	/* phase 2: replace file->f_op with special dummy operations */
 	
@@ -298,6 +313,8 @@ int snd_card_disconnect(struct snd_card *card)
 	return 0;	
 }
 
+EXPORT_SYMBOL(snd_card_disconnect);
+
 /**
  *  snd_card_free - frees given soundcard structure
  *  @card: soundcard structure
@@ -315,9 +332,9 @@ int snd_card_free(struct snd_card *card)
 
 	if (card == NULL)
 		return -EINVAL;
-	write_lock(&snd_card_rwlock);
+	mutex_lock(&snd_card_mutex);
 	snd_cards[card->number] = NULL;
-	write_unlock(&snd_card_rwlock);
+	mutex_unlock(&snd_card_mutex);
 
 #ifdef CONFIG_PM
 	wake_up(&card->power_sleep);
@@ -353,13 +370,15 @@ int snd_card_free(struct snd_card *card)
 		card->s_f_ops = s_f_ops->next;
 		kfree(s_f_ops);
 	}
-	write_lock(&snd_card_rwlock);
+	mutex_lock(&snd_card_mutex);
 	snd_cards_lock &= ~(1 << card->number);
-	write_unlock(&snd_card_rwlock);
+	mutex_unlock(&snd_card_mutex);
 	kfree(card);
 	return 0;
 }
 
+EXPORT_SYMBOL(snd_card_free);
+
 static void snd_card_free_thread(void * __card)
 {
 	struct snd_card *card = __card;
@@ -405,6 +424,8 @@ int snd_card_free_in_thread(struct snd_card *card)
 	return -EFAULT;
 }
 
+EXPORT_SYMBOL(snd_card_free_in_thread);
+
 static void choose_default_id(struct snd_card *card)
 {
 	int i, len, idx_flag = 0, loops = SNDRV_CARDS;
@@ -487,16 +508,16 @@ int snd_card_register(struct snd_card *card)
 	snd_assert(card != NULL, return -EINVAL);
 	if ((err = snd_device_register_all(card)) < 0)
 		return err;
-	write_lock(&snd_card_rwlock);
+	mutex_lock(&snd_card_mutex);
 	if (snd_cards[card->number]) {
 		/* already registered */
-		write_unlock(&snd_card_rwlock);
+		mutex_unlock(&snd_card_mutex);
 		return 0;
 	}
 	if (card->id[0] == '\0')
 		choose_default_id(card);
 	snd_cards[card->number] = card;
-	write_unlock(&snd_card_rwlock);
+	mutex_unlock(&snd_card_mutex);
 	init_info_for_card(card);
 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
 	if (snd_mixer_oss_notify_callback)
@@ -505,8 +526,10 @@ int snd_card_register(struct snd_card *card)
 	return 0;
 }
 
+EXPORT_SYMBOL(snd_card_register);
+
 #ifdef CONFIG_PROC_FS
-static struct snd_info_entry *snd_card_info_entry = NULL;
+static struct snd_info_entry *snd_card_info_entry;
 
 static void snd_card_info_read(struct snd_info_entry *entry,
 			       struct snd_info_buffer *buffer)
@@ -515,7 +538,7 @@ static void snd_card_info_read(struct snd_info_entry *entry,
 	struct snd_card *card;
 
 	for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
-		read_lock(&snd_card_rwlock);
+		mutex_lock(&snd_card_mutex);
 		if ((card = snd_cards[idx]) != NULL) {
 			count++;
 			snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
@@ -526,7 +549,7 @@ static void snd_card_info_read(struct snd_info_entry *entry,
 			snd_iprintf(buffer, "                      %s\n",
 					card->longname);
 		}
-		read_unlock(&snd_card_rwlock);
+		mutex_unlock(&snd_card_mutex);
 	}
 	if (!count)
 		snd_iprintf(buffer, "--- no soundcards ---\n");
@@ -540,12 +563,12 @@ void snd_card_info_read_oss(struct snd_info_buffer *buffer)
 	struct snd_card *card;
 
 	for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
-		read_lock(&snd_card_rwlock);
+		mutex_lock(&snd_card_mutex);
 		if ((card = snd_cards[idx]) != NULL) {
 			count++;
 			snd_iprintf(buffer, "%s\n", card->longname);
 		}
-		read_unlock(&snd_card_rwlock);
+		mutex_unlock(&snd_card_mutex);
 	}
 	if (!count) {
 		snd_iprintf(buffer, "--- no soundcards ---\n");
@@ -563,11 +586,11 @@ static void snd_card_module_info_read(struct snd_info_entry *entry,
 	struct snd_card *card;
 
 	for (idx = 0; idx < SNDRV_CARDS; idx++) {
-		read_lock(&snd_card_rwlock);
+		mutex_lock(&snd_card_mutex);
 		if ((card = snd_cards[idx]) != NULL)
 			snd_iprintf(buffer, "%2i %s\n",
 				    idx, card->module->name);
-		read_unlock(&snd_card_rwlock);
+		mutex_unlock(&snd_card_mutex);
 	}
 }
 #endif
@@ -579,7 +602,6 @@ int __init snd_card_info_init(void)
 	entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
 	if (! entry)
 		return -ENOMEM;
-	entry->c.text.read_size = PAGE_SIZE;
 	entry->c.text.read = snd_card_info_read;
 	if (snd_info_register(entry) < 0) {
 		snd_info_free_entry(entry);
@@ -590,7 +612,6 @@ int __init snd_card_info_init(void)
 #ifdef MODULE
 	entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
 	if (entry) {
-		entry->c.text.read_size = PAGE_SIZE;
 		entry->c.text.read = snd_card_module_info_read;
 		if (snd_info_register(entry) < 0)
 			snd_info_free_entry(entry);
@@ -644,6 +665,8 @@ int snd_component_add(struct snd_card *card, const char *component)
 	return 0;
 }
 
+EXPORT_SYMBOL(snd_component_add);
+
 /**
  *  snd_card_file_add - add the file to the file list of the card
  *  @card: soundcard structure
@@ -676,6 +699,8 @@ int snd_card_file_add(struct snd_card *card, struct file *file)
 	return 0;
 }
 
+EXPORT_SYMBOL(snd_card_file_add);
+
 /**
  *  snd_card_file_remove - remove the file from the file list
  *  @card: soundcard structure
@@ -717,6 +742,8 @@ int snd_card_file_remove(struct snd_card *card, struct file *file)
 	return 0;
 }
 
+EXPORT_SYMBOL(snd_card_file_remove);
+
 #ifdef CONFIG_PM
 /**
  *  snd_power_wait - wait until the power-state is changed.
@@ -753,4 +780,5 @@ int snd_power_wait(struct snd_card *card, unsigned int power_state)
 	return result;
 }
 
+EXPORT_SYMBOL(snd_power_wait);
 #endif /* CONFIG_PM */