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authorTakashi Iwai <tiwai@suse.de>2014-01-29 15:13:43 +0400
committerTakashi Iwai <tiwai@suse.de>2014-02-14 11:14:13 +0400
commitf24640648186b59bd39f8cd640d631bdb61a3197 (patch)
treea73d73fd6d100ace77a0f67d7af3df367251d1bc /sound/core/init.c
parent34356dbdb64e9f12cc8ce1bb0d9e38a75b1e4638 (diff)
downloadlinux-f24640648186b59bd39f8cd640d631bdb61a3197.tar.xz
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>
Diffstat (limited to 'sound/core/init.c')
-rw-r--r--sound/core/init.c53
1 files changed, 15 insertions, 38 deletions
diff --git a/sound/core/init.c b/sound/core/init.c
index ff96eda898e3..5b7c4eb46c10 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);
@@ -474,58 +473,36 @@ 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 */
@@ -932,7 +909,7 @@ 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;
}
@@ -975,7 +952,7 @@ 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;
}