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Commit 61ca4107 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: hda - Don't assume non-NULL PCM ops 



The PCM ops might be set NULL, or cleared to NULL when the driver is
unbound.  Give a proper NULL check at each place to be more robust.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent bbbc7e85

sound/pci/hda/hda_codec.c

+7 −2
Original line number Diff line number Diff line
@@ -4525,7 +4525,11 @@ int snd_hda_codec_prepare(struct hda_codec *codec, 
{

	int ret;

	mutex_lock(&codec->bus->prepare_mutex);

	ret = hinfo->ops.prepare(hinfo, codec, stream, format, substream);

	if (hinfo->ops.prepare)

		ret = hinfo->ops.prepare(hinfo, codec, stream, format,

					 substream);

	else

		ret = -ENODEV;

	if (ret >= 0)

		purify_inactive_streams(codec);

	mutex_unlock(&codec->bus->prepare_mutex);
@@ -4546,6 +4550,7 @@ void snd_hda_codec_cleanup(struct hda_codec *codec, 
			   struct snd_pcm_substream *substream)

{

	mutex_lock(&codec->bus->prepare_mutex);

	if (hinfo->ops.cleanup)

		hinfo->ops.cleanup(hinfo, codec, substream);

	mutex_unlock(&codec->bus->prepare_mutex);

}

sound/pci/hda/hda_controller.c

+19 −11
Original line number Diff line number Diff line
@@ -416,6 +416,7 @@ static int azx_pcm_close(struct snd_pcm_substream *substream) 
	azx_dev->running = 0;

	spin_unlock_irqrestore(&chip->reg_lock, flags);

	azx_release_device(azx_dev);

	if (hinfo->ops.close)

		hinfo->ops.close(hinfo, apcm->codec, substream);

	snd_hda_power_down(apcm->codec);

	mutex_unlock(&chip->open_mutex);
@@ -808,8 +809,8 @@ static int azx_pcm_open(struct snd_pcm_substream *substream) 
	mutex_lock(&chip->open_mutex);

	azx_dev = azx_assign_device(chip, substream);

	if (azx_dev == NULL) {

		mutex_unlock(&chip->open_mutex);

		return -EBUSY;

		err = -EBUSY;

		goto unlock;

	}

	runtime->hw = azx_pcm_hw;

	runtime->hw.channels_min = hinfo->channels_min;
@@ -844,12 +845,13 @@ static int azx_pcm_open(struct snd_pcm_substream *substream) 
	snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,

				   buff_step);

	snd_hda_power_up(apcm->codec);

	if (hinfo->ops.open)

		err = hinfo->ops.open(hinfo, apcm->codec, substream);

	else

		err = -ENODEV;

	if (err < 0) {

		azx_release_device(azx_dev);

		snd_hda_power_down(apcm->codec);

		mutex_unlock(&chip->open_mutex);

		return err;

		goto powerdown;

	}

	snd_pcm_limit_hw_rates(runtime);

	/* sanity check */
@@ -858,10 +860,10 @@ static int azx_pcm_open(struct snd_pcm_substream *substream) 
	    snd_BUG_ON(!runtime->hw.formats) ||

	    snd_BUG_ON(!runtime->hw.rates)) {

		azx_release_device(azx_dev);

		if (hinfo->ops.close)

			hinfo->ops.close(hinfo, apcm->codec, substream);

		snd_hda_power_down(apcm->codec);

		mutex_unlock(&chip->open_mutex);

		return -EINVAL;

		err = -EINVAL;

		goto powerdown;

	}



	/* disable LINK_ATIME timestamps for capture streams
@@ -880,6 +882,12 @@ static int azx_pcm_open(struct snd_pcm_substream *substream) 
	snd_pcm_set_sync(substream);

	mutex_unlock(&chip->open_mutex);

	return 0;



 powerdown:

	snd_hda_power_down(apcm->codec);

 unlock:

	mutex_unlock(&chip->open_mutex);

	return err;

}



static int azx_pcm_mmap(struct snd_pcm_substream *substream,