ALSA: Use standard device refcount for card accounting
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>
diff --git a/sound/core/init.c b/sound/core/init.c
index ff96eda..5b7c4eb 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 @@
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);
@@ -474,58 +473,36 @@
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);
- return ret;
- }
-
- card->free_on_last_close = 1;
- if (atomic_dec_and_test(&card->refcount))
- 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);
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);
return 0;
}
+EXPORT_SYMBOL(snd_card_free_when_closed);
+int snd_card_free(struct snd_card *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_for_completion(&released);
+ return 0;
+}
EXPORT_SYMBOL(snd_card_free);
/* retrieve the last word of shortname or longname */
@@ -932,7 +909,7 @@
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;
}
@@ -975,7 +952,7 @@
return -ENOENT;
}
kfree(found);
- snd_card_unref(card);
+ put_device(&card->card_dev);
return 0;
}