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Commit a65d629c authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: hda - Add pseudo device-locking for clear/reconfig 



Added the pseudo device-locking using card->shutdown flag to avoid
the crash via clear/reconfig during operations.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 209b1403

sound/pci/hda/hda_codec.c

+50 −4
Original line number Diff line number Diff line
@@ -1445,9 +1445,52 @@ void snd_hda_ctls_clear(struct hda_codec *codec) 
	snd_array_free(&codec->mixers);

}



void snd_hda_codec_reset(struct hda_codec *codec)

/* pseudo device locking

 * toggle card->shutdown to allow/disallow the device access (as a hack)

 */

static int hda_lock_devices(struct snd_card *card)

{

	int i;

	spin_lock(&card->files_lock);

	if (card->shutdown) {

		spin_unlock(&card->files_lock);

		return -EINVAL;

	}

	card->shutdown = 1;

	spin_unlock(&card->files_lock);

	return 0;

}



static void hda_unlock_devices(struct snd_card *card)

{

	spin_lock(&card->files_lock);

	card->shutdown = 0;

	spin_unlock(&card->files_lock);

}



int snd_hda_codec_reset(struct hda_codec *codec)

{

	struct snd_card *card = codec->bus->card;

	int i, pcm;



	if (hda_lock_devices(card) < 0)

		return -EBUSY;

	/* check whether the codec isn't used by any mixer or PCM streams */

	if (!list_empty(&card->ctl_files)) {

		hda_unlock_devices(card);

		return -EBUSY;

	}

	for (pcm = 0; pcm < codec->num_pcms; pcm++) {

		struct hda_pcm *cpcm = &codec->pcm_info[pcm];

		if (!cpcm->pcm)

			continue;

		if (cpcm->pcm->streams[0].substream_opened ||

		    cpcm->pcm->streams[1].substream_opened) {

			hda_unlock_devices(card);

			return -EBUSY;

		}

	}



	/* OK, let it free */



#ifdef CONFIG_SND_HDA_POWER_SAVE

	cancel_delayed_work(&codec->power_work);
@@ -1457,8 +1500,7 @@ void snd_hda_codec_reset(struct hda_codec *codec) 
	/* relase PCMs */

	for (i = 0; i < codec->num_pcms; i++) {

		if (codec->pcm_info[i].pcm) {

			snd_device_free(codec->bus->card,

					codec->pcm_info[i].pcm);

			snd_device_free(card, codec->pcm_info[i].pcm);

			clear_bit(codec->pcm_info[i].device,

				  codec->bus->pcm_dev_bits);

		}
@@ -1479,6 +1521,10 @@ void snd_hda_codec_reset(struct hda_codec *codec) 
	codec->preset = NULL;

	module_put(codec->owner);

	codec->owner = NULL;



	/* allow device access again */

	hda_unlock_devices(card);

	return 0;

}

#endif /* CONFIG_SND_HDA_RECONFIG */

sound/pci/hda/hda_hwdep.c

+13 −2
Original line number Diff line number Diff line
@@ -155,7 +155,13 @@ int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec) 


static int clear_codec(struct hda_codec *codec)

{

	snd_hda_codec_reset(codec);

	int err;



	err = snd_hda_codec_reset(codec);

	if (err < 0) {

		snd_printk(KERN_ERR "The codec is being used, can't free.\n");

		return err;

	}

	clear_hwdep_elements(codec);

	return 0;

}
@@ -165,7 +171,12 @@ static int reconfig_codec(struct hda_codec *codec) 
	int err;



	snd_printk(KERN_INFO "hda-codec: reconfiguring\n");

	snd_hda_codec_reset(codec);

	err = snd_hda_codec_reset(codec);

	if (err < 0) {

		snd_printk(KERN_ERR

			   "The codec is being used, can't reconfigure.\n");

		return err;

	}

	err = snd_hda_codec_configure(codec);

	if (err < 0)

		return err;

sound/pci/hda/hda_local.h

+1 −1
Original line number Diff line number Diff line
@@ -98,7 +98,7 @@ struct snd_kcontrol *snd_hda_find_mixer_ctl(struct hda_codec *codec, 
					    const char *name);

int snd_hda_add_vmaster(struct hda_codec *codec, char *name,

			unsigned int *tlv, const char **slaves);

void snd_hda_codec_reset(struct hda_codec *codec);

int snd_hda_codec_reset(struct hda_codec *codec);

int snd_hda_codec_configure(struct hda_codec *codec);



/* amp value bits */