[ALSA] Unregister device files at disconnection

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>

1 files changed, 4 insertions, 4 deletions

diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index 51e83d7a839a..b35280ca2465 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -1817,13 +1817,13 @@ static int snd_ac97_dev_register(struct snd_device *device)
         return 0;
 }
 
-/* unregister ac97 codec */
-static int snd_ac97_dev_unregister(struct snd_device *device)
+/* disconnect ac97 codec */
+static int snd_ac97_dev_disconnect(struct snd_device *device)
 {
         struct snd_ac97 *ac97 = device->device_data;
         if (ac97->dev.bus)
                 device_unregister(&ac97->dev);
-        return snd_ac97_free(ac97);
+        return 0;
 }
 
 /* build_ops to do nothing */
@@ -1860,7 +1860,7 @@ int snd_ac97_mixer(struct snd_ac97_bus *bus, struct snd_ac97_template *template,
         static struct snd_device_ops ops = {
                 .dev_free =     snd_ac97_dev_free,
                 .dev_register = snd_ac97_dev_register,
-                .dev_unregister =       snd_ac97_dev_unregister,
+                .dev_disconnect =       snd_ac97_dev_disconnect,
         };
 
         snd_assert(rac97 != NULL, return -EINVAL);