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[ALSA] Unregister device files at disconnection

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Orignally proposed by Sam Revitch <sam.revitch@gmail.com>.
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 <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai
2006-06-23 14:38:23 +02:00
committed by Jaroslav Kysela
parent 746d4a02e6
commit c461482c80
15 changed files with 149 additions and 173 deletions
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20
sound/core/device.c
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@@ -71,7 +71,7 @@ EXPORT_SYMBOL(snd_device_new);
* @device_data: the data pointer to release
*
* Removes the device from the list on the card and invokes the
* callback, dev_unregister or dev_free, corresponding to the state.
* callbacks, dev_disconnect and dev_free, corresponding to the state.
* Then release the device.
*
* Returns zero if successful, or a negative error code on failure or if the
@@ -90,16 +90,14 @@ int snd_device_free(struct snd_card *card, void *device_data)
continue;
/* unlink */
list_del(&dev->list);
if ((dev->state == SNDRV_DEV_REGISTERED ||
dev->state == SNDRV_DEV_DISCONNECTED) &&
dev->ops->dev_unregister) {
if (dev->ops->dev_unregister(dev))
snd_printk(KERN_ERR "device unregister failure\n");
} else {
if (dev->ops->dev_free) {
if (dev->ops->dev_free(dev))
snd_printk(KERN_ERR "device free failure\n");
}
if (dev->state == SNDRV_DEV_REGISTERED &&
dev->ops->dev_disconnect)
if (dev->ops->dev_disconnect(dev))
snd_printk(KERN_ERR
"device disconnect failure\n");
if (dev->ops->dev_free) {
if (dev->ops->dev_free(dev))
snd_printk(KERN_ERR "device free failure\n");
}
kfree(dev);
return 0;