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ALSA: control: Embed struct device 

This patch embeds a struct device for the control device into the card
object and avoid the device creation at registration time.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-29 16:41:27 +01:00
parent 4b440be667
commit 0fcd9f4b3c
2 changed files with 17 additions and 24 deletions
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1
include/sound/core.h
View File

@ -109,6 +109,7 @@ struct snd_card {
private data */
struct list_head devices; /* devices */
struct device ctl_dev; /* control device */
unsigned int last_numid; /* last used numeric ID */
struct rw_semaphore controls_rwsem; /* controls list lock */
rwlock_t ctl_files_rwlock; /* ctl_files list lock */

40
sound/core/control.c
View File

@ -1660,19 +1660,10 @@ static const struct file_operations snd_ctl_f_ops =
static int snd_ctl_dev_register(struct snd_device *device)
{
struct snd_card *card = device->device_data;
int err, cardnum;
char name[16];
if (snd_BUG_ON(!card))
return -ENXIO;
cardnum = card->number;
if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
return -ENXIO;
sprintf(name, "controlC%i", cardnum);
if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
&snd_ctl_f_ops, card, name)) < 0)
return err;
return 0;
return snd_register_device_for_dev(SNDRV_DEVICE_TYPE_CONTROL, card,
-1, &snd_ctl_f_ops, card,
&card->ctl_dev, NULL, NULL);
}
/*
@ -1682,13 +1673,6 @@ static int snd_ctl_dev_disconnect(struct snd_device *device)
{
struct snd_card *card = device->device_data;
struct snd_ctl_file *ctl;
int err, cardnum;
if (snd_BUG_ON(!card))
return -ENXIO;
cardnum = card->number;
if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
return -ENXIO;
read_lock(&card->ctl_files_rwlock);
list_for_each_entry(ctl, &card->ctl_files, list) {
@ -1697,10 +1681,7 @@ static int snd_ctl_dev_disconnect(struct snd_device *device)
}
read_unlock(&card->ctl_files_rwlock);
if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
card, -1)) < 0)
return err;
return 0;
return snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1);
}
/*
@ -1717,6 +1698,7 @@ static int snd_ctl_dev_free(struct snd_device *device)
snd_ctl_remove(card, control);
}
up_write(&card->controls_rwsem);
put_device(&card->ctl_dev);
return 0;
}
@ -1731,10 +1713,20 @@ int snd_ctl_create(struct snd_card *card)
.dev_register = snd_ctl_dev_register,
.dev_disconnect = snd_ctl_dev_disconnect,
};
int err;
if (snd_BUG_ON(!card))
return -ENXIO;
return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS))
return -ENXIO;
snd_device_initialize(&card->ctl_dev, card);
dev_set_name(&card->ctl_dev, "controlC%d", card->number);
err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
if (err < 0)
put_device(&card->ctl_dev);
return err;
}
/*