From 746d4a02e68499fc6c1f8d0c43d2271853ade181 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Fri, 23 Jun 2006 14:37:59 +0200 Subject: [ALSA] Fix disconnection of proc interface - Add the linked list to each proc entry to enable a single-shot disconnection (unregister) - Deprecate snd_info_unregister(), use snd_info_free_entry() - Removed NULL checks of snd_info_free_entry() Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/core/init.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'sound/core/init.c') diff --git a/sound/core/init.c b/sound/core/init.c index 4d9258884e44..1ecb029ff4c9 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -310,6 +310,7 @@ int snd_card_disconnect(struct snd_card *card) if (err < 0) snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); + snd_info_card_disconnect(card); return 0; } @@ -360,7 +361,7 @@ int snd_card_free(struct snd_card *card) } if (card->private_free) card->private_free(card); - snd_info_unregister(card->proc_id); + snd_info_free_entry(card->proc_id); if (snd_info_card_free(card) < 0) { snd_printk(KERN_WARNING "unable to free card info\n"); /* Not fatal error */ @@ -625,9 +626,9 @@ int __init snd_card_info_init(void) int __exit snd_card_info_done(void) { - snd_info_unregister(snd_card_info_entry); + snd_info_free_entry(snd_card_info_entry); #ifdef MODULE - snd_info_unregister(snd_card_module_info_entry); + snd_info_free_entry(snd_card_module_info_entry); #endif return 0; } -- cgit v1.2.3 From c461482c8072bb073e6146db320d3da85cdc89ad Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Fri, 23 Jun 2006 14:38:23 +0200 Subject: [ALSA] Unregister device files at disconnection Orignally proposed by Sam Revitch . Unregister device files at disconnection to avoid the futher accesses. Also, the dev_unregister callback is removed and replaced with the combination of disconnect + free. A new function snd_card_free_when_closed() is introduced, which is used in USB disconnect callback. Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/core/init.c | 69 +++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 54 insertions(+), 15 deletions(-) (limited to 'sound/core/init.c') diff --git a/sound/core/init.c b/sound/core/init.c index 1ecb029ff4c9..5850d99d21e3 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -327,22 +327,10 @@ EXPORT_SYMBOL(snd_card_disconnect); * Returns zero. Frees all associated devices and frees the control * interface associated to given soundcard. */ -int snd_card_free(struct snd_card *card) +static int snd_card_do_free(struct snd_card *card) { struct snd_shutdown_f_ops *s_f_ops; - if (card == NULL) - return -EINVAL; - mutex_lock(&snd_card_mutex); - snd_cards[card->number] = NULL; - mutex_unlock(&snd_card_mutex); - -#ifdef CONFIG_PM - wake_up(&card->power_sleep); -#endif - /* wait, until all devices are ready for the free operation */ - wait_event(card->shutdown_sleep, card->files == NULL); - #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) if (snd_mixer_oss_notify_callback) snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); @@ -371,10 +359,55 @@ int snd_card_free(struct snd_card *card) card->s_f_ops = s_f_ops->next; kfree(s_f_ops); } + kfree(card); + return 0; +} + +static int snd_card_free_prepare(struct snd_card *card) +{ + if (card == NULL) + return -EINVAL; + (void) snd_card_disconnect(card); mutex_lock(&snd_card_mutex); + snd_cards[card->number] = NULL; snd_cards_lock &= ~(1 << card->number); mutex_unlock(&snd_card_mutex); - kfree(card); +#ifdef CONFIG_PM + wake_up(&card->power_sleep); +#endif + return 0; +} + +int snd_card_free_when_closed(struct snd_card *card) +{ + int free_now = 0; + int ret = snd_card_free_prepare(card); + if (ret) + return ret; + + spin_lock(&card->files_lock); + if (card->files == NULL) + free_now = 1; + else + card->free_on_last_close = 1; + spin_unlock(&card->files_lock); + + if (free_now) + snd_card_do_free(card); + return 0; +} + +EXPORT_SYMBOL(snd_card_free_when_closed); + +int snd_card_free(struct snd_card *card) +{ + int ret = snd_card_free_prepare(card); + if (ret) + return ret; + + /* wait, until all devices are ready for the free operation */ + wait_event(card->shutdown_sleep, card->files == NULL); + snd_card_do_free(card); return 0; } @@ -718,6 +751,7 @@ 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; + int last_close = 0; spin_lock(&card->files_lock); mfile = card->files; @@ -732,9 +766,14 @@ int snd_card_file_remove(struct snd_card *card, struct file *file) pfile = mfile; mfile = mfile->next; } - spin_unlock(&card->files_lock); if (card->files == NULL) + last_close = 1; + spin_unlock(&card->files_lock); + if (last_close) { wake_up(&card->shutdown_sleep); + if (card->free_on_last_close) + snd_card_do_free(card); + } if (!mfile) { snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file); return -ENOENT; -- cgit v1.2.3 From 2b29b13c5794f648cd5e839796496704d787f5a6 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Fri, 23 Jun 2006 14:38:26 +0200 Subject: [ALSA] Deprecate snd_card_free_in_thread() Deprecated snd_card_free_in_thread(), replaced with snd_card_free_when_closed(). Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/core/init.c | 56 +++---------------------------------------------------- 1 file changed, 3 insertions(+), 53 deletions(-) (limited to 'sound/core/init.c') diff --git a/sound/core/init.c b/sound/core/init.c index 5850d99d21e3..d7607a25acdf 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -81,8 +81,6 @@ static inline int init_info_for_card(struct snd_card *card) #define init_info_for_card(card) #endif -static void snd_card_free_thread(void * __card); - /** * snd_card_new - create and initialize a soundcard structure * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] @@ -145,7 +143,6 @@ struct snd_card *snd_card_new(int idx, const char *xid, INIT_LIST_HEAD(&card->ctl_files); spin_lock_init(&card->files_lock); init_waitqueue_head(&card->shutdown_sleep); - INIT_WORK(&card->free_workq, snd_card_free_thread, card); #ifdef CONFIG_PM mutex_init(&card->power_lock); init_waitqueue_head(&card->power_sleep); @@ -413,53 +410,6 @@ int snd_card_free(struct snd_card *card) EXPORT_SYMBOL(snd_card_free); -static void snd_card_free_thread(void * __card) -{ - struct snd_card *card = __card; - struct module * module = card->module; - - if (!try_module_get(module)) { - snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); - module = NULL; - } - - snd_card_free(card); - - module_put(module); -} - -/** - * snd_card_free_in_thread - call snd_card_free() in thread - * @card: soundcard structure - * - * This function schedules the call of snd_card_free() function in a - * work queue. When all devices are released (non-busy), the work - * is woken up and calls snd_card_free(). - * - * When a card can be disconnected at any time by hotplug service, - * this function should be used in disconnect (or detach) callback - * instead of calling snd_card_free() directly. - * - * Returns - zero otherwise a negative error code if the start of thread failed. - */ -int snd_card_free_in_thread(struct snd_card *card) -{ - if (card->files == NULL) { - snd_card_free(card); - return 0; - } - - if (schedule_work(&card->free_workq)) - return 0; - - snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); - /* try to free the structure immediately */ - snd_card_free(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; @@ -742,9 +692,9 @@ EXPORT_SYMBOL(snd_card_file_add); * * This function removes the file formerly added to the card via * snd_card_file_add() function. - * If all files are removed and the release of the card is - * scheduled, it will wake up the the thread to call snd_card_free() - * (see snd_card_free_in_thread() function). + * If all files are removed and snd_card_free_when_closed() was + * called beforehand, it processes the pending release of + * resources. * * Returns zero or a negative error code. */ -- cgit v1.2.3