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[ALSA] Unregister device files at disconnection

Browse source 
Orignally proposed by Sam Revitch <[email protected]>.
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 <[email protected]>
Signed-off-by: Jaroslav Kysela <[email protected]>
This commit is contained in:
Takashi Iwai 2006-06-23 14:38:23 +02:00 • committed by Jaroslav Kysela
commit c461482c80
15 changed files with 148 additions and 172 deletions
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3
include/sound/core.h
View file

@ -71,7 +71,6 @@ struct snd_device_ops {
int (*dev_free)(struct snd_device *dev);
int (*dev_register)(struct snd_device *dev);
int (*dev_disconnect)(struct snd_device *dev);
int (*dev_unregister)(struct snd_device *dev);
};
struct snd_device {
@ -131,6 +130,7 @@ struct snd_card {
state */
spinlock_t files_lock; /* lock the files for this card */
int shutdown; /* this card is going down */
int free_on_last_close; /* free in context of file_release */
wait_queue_head_t shutdown_sleep;
struct work_struct free_workq; /* for free in workqueue */
struct device *dev;
@ -244,6 +244,7 @@ struct snd_card *snd_card_new(int idx, const char *id,
struct module *module, int extra_size);
int snd_card_disconnect(struct snd_card *card);
int snd_card_free(struct snd_card *card);
int snd_card_free_when_closed(struct snd_card *card);
int snd_card_free_in_thread(struct snd_card *card);
int snd_card_register(struct snd_card *card);
int snd_card_info_init(void);

1
include/sound/timer.h
View file

@ -129,7 +129,6 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstam
int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer);
int snd_timer_global_free(struct snd_timer *timer);
int snd_timer_global_register(struct snd_timer *timer);
int snd_timer_global_unregister(struct snd_timer *timer);
int snd_timer_open(struct snd_timer_instance **ti, char *owner, struct snd_timer_id *tid, unsigned int slave_id);
int snd_timer_close(struct snd_timer_instance *timeri);