Drop the own refcount but use the standard device refcounting via get_device() and put_device(). Introduce a new completion to snd_card instead of the wait queue for syncing the last release, which is used in snd_card_free().
Signed-off-by: Takashi Iwai tiwai@suse.de --- include/sound/core.h | 7 +++---- sound/core/init.c | 53 ++++++++++++++------------------------------------ sound/core/sound.c | 2 +- sound/core/sound_oss.c | 2 +- 4 files changed, 20 insertions(+), 44 deletions(-)
diff --git a/include/sound/core.h b/include/sound/core.h index f072e596f21a..f410a49862fd 100644 --- a/include/sound/core.h +++ b/include/sound/core.h @@ -42,6 +42,7 @@ /* forward declarations */ struct pci_dev; struct module; +struct completion;
/* device allocation stuff */
@@ -126,9 +127,7 @@ 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; - atomic_t refcount; /* refcount for disconnection */ + struct completion *release_completion; struct device *dev; /* device assigned to this card */ struct device card_dev; /* cardX object for sysfs */ bool registered; /* card_dev is registered? */ @@ -302,7 +301,7 @@ int snd_card_info_done(void); int snd_component_add(struct snd_card *card, const char *component); int snd_card_file_add(struct snd_card *card, struct file *file); int snd_card_file_remove(struct snd_card *card, struct file *file); -void snd_card_unref(struct snd_card *card); +#define snd_card_unref(card) put_device(&(card)->card_dev)
#define snd_card_set_dev(card, devptr) ((card)->dev = (devptr))
diff --git a/sound/core/init.c b/sound/core/init.c index 46a9e7cb1c04..3fdb4e2ce5ea 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -28,6 +28,7 @@ #include <linux/time.h> #include <linux/ctype.h> #include <linux/pm.h> +#include <linux/completion.h>
#include <sound/core.h> #include <sound/control.h> @@ -235,8 +236,6 @@ int snd_card_new(struct device *parent, int idx, const char *xid, INIT_LIST_HEAD(&card->ctl_files); spin_lock_init(&card->files_lock); INIT_LIST_HEAD(&card->files_list); - init_waitqueue_head(&card->shutdown_sleep); - atomic_set(&card->refcount, 0); #ifdef CONFIG_PM mutex_init(&card->power_lock); init_waitqueue_head(&card->power_sleep); @@ -466,58 +465,36 @@ static int snd_card_do_free(struct snd_card *card) snd_printk(KERN_WARNING "unable to free card info\n"); /* Not fatal error */ } + if (card->release_completion) + complete(card->release_completion); kfree(card); return 0; }
-/** - * snd_card_unref - release the reference counter - * @card: the card instance - * - * Decrements the reference counter. When it reaches to zero, wake up - * the sleeper and call the destructor if needed. - */ -void snd_card_unref(struct snd_card *card) -{ - if (atomic_dec_and_test(&card->refcount)) { - wake_up(&card->shutdown_sleep); - if (card->free_on_last_close) - put_device(&card->card_dev); - } -} -EXPORT_SYMBOL(snd_card_unref); - int snd_card_free_when_closed(struct snd_card *card) { - int ret; - - atomic_inc(&card->refcount); - ret = snd_card_disconnect(card); - if (ret) { - atomic_dec(&card->refcount); + int ret = snd_card_disconnect(card); + if (ret) return ret; - } - - card->free_on_last_close = 1; - if (atomic_dec_and_test(&card->refcount)) - put_device(&card->card_dev); + put_device(&card->card_dev); return 0; } - EXPORT_SYMBOL(snd_card_free_when_closed);
int snd_card_free(struct snd_card *card) { - int ret = snd_card_disconnect(card); + struct completion released; + int ret; + + init_completion(&released); + card->release_completion = &released; + ret = snd_card_free_when_closed(card); if (ret) return ret; - /* wait, until all devices are ready for the free operation */ - wait_event(card->shutdown_sleep, !atomic_read(&card->refcount)); - put_device(&card->card_dev); + wait_for_completion(&released); return 0; } - EXPORT_SYMBOL(snd_card_free);
/* retrieve the last word of shortname or longname */ @@ -924,7 +901,7 @@ int snd_card_file_add(struct snd_card *card, struct file *file) return -ENODEV; } list_add(&mfile->list, &card->files_list); - atomic_inc(&card->refcount); + get_device(&card->card_dev); spin_unlock(&card->files_lock); return 0; } @@ -967,7 +944,7 @@ int snd_card_file_remove(struct snd_card *card, struct file *file) return -ENOENT; } kfree(found); - snd_card_unref(card); + put_device(&card->card_dev); return 0; }
diff --git a/sound/core/sound.c b/sound/core/sound.c index 437c25ea6403..4aaa53161644 100644 --- a/sound/core/sound.c +++ b/sound/core/sound.c @@ -118,7 +118,7 @@ void *snd_lookup_minor_data(unsigned int minor, int type) if (mreg && mreg->type == type) { private_data = mreg->private_data; if (private_data && mreg->card_ptr) - atomic_inc(&mreg->card_ptr->refcount); + get_device(&mreg->card_ptr->card_dev); } else private_data = NULL; mutex_unlock(&sound_mutex); diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c index b19184d45f19..573a65eb2b79 100644 --- a/sound/core/sound_oss.c +++ b/sound/core/sound_oss.c @@ -55,7 +55,7 @@ void *snd_lookup_oss_minor_data(unsigned int minor, int type) if (mreg && mreg->type == type) { private_data = mreg->private_data; if (private_data && mreg->card_ptr) - atomic_inc(&mreg->card_ptr->refcount); + get_device(&mreg->card_ptr->card_dev); } else private_data = NULL; mutex_unlock(&sound_oss_mutex);