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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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16
sound/core/oss/mixer_oss.c
View File

@@ -1310,21 +1310,19 @@ static int snd_mixer_oss_notify_handler(struct snd_card *card, int cmd)
card->mixer_oss = mixer;
snd_mixer_oss_build(mixer);
snd_mixer_oss_proc_init(mixer);
} else if (cmd == SND_MIXER_OSS_NOTIFY_DISCONNECT) {
mixer = card->mixer_oss;
if (mixer == NULL || !mixer->oss_dev_alloc)
return 0;
snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER, mixer->card, 0);
mixer->oss_dev_alloc = 0;
} else { /* free */
} else {
mixer = card->mixer_oss;
if (mixer == NULL)
return 0;
if (mixer->oss_dev_alloc) {
#ifdef SNDRV_OSS_INFO_DEV_MIXERS
snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIXERS, mixer->card->number);
snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIXERS, mixer->card->number);
#endif
if (mixer->oss_dev_alloc)
snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER, mixer->card, 0);
mixer->oss_dev_alloc = 0;
}
if (cmd == SND_MIXER_OSS_NOTIFY_DISCONNECT)
return 0;
snd_mixer_oss_proc_done(mixer);
return snd_mixer_oss_free1(mixer);
}

16
sound/core/oss/pcm_oss.c
View File

@@ -2929,6 +2929,12 @@ static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
pcm->card, 1);
}
if (dsp_map[pcm->card->number] == (int)pcm->device) {
#ifdef SNDRV_OSS_INFO_DEV_AUDIO
snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
#endif
}
pcm->oss.reg = 0;
}
return 0;
}
@@ -2936,15 +2942,7 @@ static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
{
snd_pcm_oss_disconnect_minor(pcm);
if (pcm->oss.reg) {
if (dsp_map[pcm->card->number] == (int)pcm->device) {
#ifdef SNDRV_OSS_INFO_DEV_AUDIO
snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
#endif
}
pcm->oss.reg = 0;
snd_pcm_oss_proc_done(pcm);
}
snd_pcm_oss_proc_done(pcm);
return 0;
}