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Unverified Commit 3fcf94ef authored by Jerome Brunet's avatar Jerome Brunet Committed by Mark Brown
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ASoC: hdmi-codec: remove reference to the current substream 



If the hdmi-codec is on a codec-to-codec link, the substream pointer
it receives is completely made up by snd_soc_dai_link_event().
The pointer will be different between startup() and shutdown().

The hdmi-codec complains when this happens even if it is not really a
problem. The current_substream pointer is not used for anything useful
apart from getting the exclusive ownership of the device.

Remove current_substream pointer and replace the exclusive locking
mechanism with a simple variable and some atomic operations.

Signed-off-by: default avatarJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 900e5daf

sound/soc/codecs/hdmi-codec.c

+16 −42
Original line number Diff line number Diff line
@@ -280,11 +280,10 @@ struct hdmi_codec_priv { 
	struct hdmi_codec_pdata hcd;

	struct snd_soc_dai_driver *daidrv;

	struct hdmi_codec_daifmt daifmt[2];

	struct mutex current_stream_lock;

	struct snd_pcm_substream *current_stream;

	uint8_t eld[MAX_ELD_BYTES];

	struct snd_pcm_chmap *chmap_info;

	unsigned int chmap_idx;

	unsigned long busy;

};



static const struct snd_soc_dapm_widget hdmi_widgets[] = {
@@ -392,42 +391,22 @@ static int hdmi_codec_chmap_ctl_get(struct snd_kcontrol *kcontrol, 
	return 0;

}



static int hdmi_codec_new_stream(struct snd_pcm_substream *substream,

static int hdmi_codec_startup(struct snd_pcm_substream *substream,

			      struct snd_soc_dai *dai)

{

	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);

	int ret = 0;



	mutex_lock(&hcp->current_stream_lock);

	if (!hcp->current_stream) {

		hcp->current_stream = substream;

	} else if (hcp->current_stream != substream) {

	ret = test_and_set_bit(0, &hcp->busy);

	if (ret) {

		dev_err(dai->dev, "Only one simultaneous stream supported!\n");

		ret = -EINVAL;

	}

	mutex_unlock(&hcp->current_stream_lock);



	return ret;

		return -EINVAL;

	}



static int hdmi_codec_startup(struct snd_pcm_substream *substream,

			      struct snd_soc_dai *dai)

{

	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);

	int ret = 0;



	ret = hdmi_codec_new_stream(substream, dai);

	if (ret)

		return ret;



	if (hcp->hcd.ops->audio_startup) {

		ret = hcp->hcd.ops->audio_startup(dai->dev->parent, hcp->hcd.data);

		if (ret) {

			mutex_lock(&hcp->current_stream_lock);

			hcp->current_stream = NULL;

			mutex_unlock(&hcp->current_stream_lock);

			return ret;

		}

		if (ret)

			goto err;

	}



	if (hcp->hcd.ops->get_eld) {
@@ -437,17 +416,18 @@ static int hdmi_codec_startup(struct snd_pcm_substream *substream, 
		if (!ret) {

			ret = snd_pcm_hw_constraint_eld(substream->runtime,

							hcp->eld);

			if (ret) {

				mutex_lock(&hcp->current_stream_lock);

				hcp->current_stream = NULL;

				mutex_unlock(&hcp->current_stream_lock);

				return ret;

			}

			if (ret)

				goto err;

		}

		/* Select chmap supported */

		hdmi_codec_eld_chmap(hcp);

	}

	return 0;



err:

	/* Release the exclusive lock on error */

	clear_bit(0, &hcp->busy);

	return ret;

}



static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
@@ -455,14 +435,10 @@ static void hdmi_codec_shutdown(struct snd_pcm_substream *substream, 
{

	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);



	WARN_ON(hcp->current_stream != substream);



	hcp->chmap_idx = HDMI_CODEC_CHMAP_IDX_UNKNOWN;

	hcp->hcd.ops->audio_shutdown(dai->dev->parent, hcp->hcd.data);



	mutex_lock(&hcp->current_stream_lock);

	hcp->current_stream = NULL;

	mutex_unlock(&hcp->current_stream_lock);

	clear_bit(0, &hcp->busy);

}



static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
@@ -761,8 +737,6 @@ static int hdmi_codec_probe(struct platform_device *pdev) 
		return -ENOMEM;



	hcp->hcd = *hcd;

	mutex_init(&hcp->current_stream_lock);



	hcp->daidrv = devm_kcalloc(dev, dai_count, sizeof(*hcp->daidrv),

				   GFP_KERNEL);

	if (!hcp->daidrv)