ASoC: SOF: topology: remove useless code

The patch "ASoC: SOF: Intel: hda: assign link DMA channel at run-time"
fixed the sof_link_hda_unload() to remove the call to the BE
hw_free op but left the rest of code that become redundant.

So, remove sof_link_hda_unload() along with the link_unload() op
entirely as it is not longer needed.
Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20210409220522.1542865-1-ranjani.sridharan@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/topology.c

@@ -3371,69 +3371,6 @@ static int sof_link_load(struct snd_soc_component *scomp, int index,
 	return ret;
 }
 
-static int sof_link_hda_unload(struct snd_sof_dev *sdev,
-			       struct snd_soc_dai_link *link)
-{
-	struct snd_soc_dai *dai;
-
-	dai = snd_soc_find_dai(link->cpus);
-	if (!dai) {
-		dev_err(sdev->dev, "error: failed to find dai %s in %s",
-			link->cpus->dai_name, __func__);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int sof_link_unload(struct snd_soc_component *scomp,
-			   struct snd_soc_dobj *dobj)
-{
-	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(scomp);
-	struct snd_soc_dai_link *link =
-		container_of(dobj, struct snd_soc_dai_link, dobj);
-
-	struct snd_sof_dai *sof_dai;
-	int ret = 0;
-
-	/* only BE link is loaded by sof */
-	if (!link->no_pcm)
-		return 0;
-
-	list_for_each_entry(sof_dai, &sdev->dai_list, list) {
-		if (!sof_dai->name)
-			continue;
-
-		if (strcmp(link->name, sof_dai->name) == 0)
-			goto found;
-	}
-
-	dev_err(scomp->dev, "error: failed to find dai %s in %s",
-		link->name, __func__);
-	return -EINVAL;
-found:
-
-	switch (sof_dai->dai_config->type) {
-	case SOF_DAI_INTEL_SSP:
-	case SOF_DAI_INTEL_DMIC:
-	case SOF_DAI_INTEL_ALH:
-	case SOF_DAI_IMX_SAI:
-	case SOF_DAI_IMX_ESAI:
-		/* no resource needs to be released for all cases above */
-		break;
-	case SOF_DAI_INTEL_HDA:
-		ret = sof_link_hda_unload(sdev, link);
-		break;
-	default:
-		dev_err(scomp->dev, "error: invalid DAI type %d\n",
-			sof_dai->dai_config->type);
-		ret = -EINVAL;
-		break;
-	}
-
-	return ret;
-}
-
 /* DAI link - used for any driver specific init */
 static int sof_route_load(struct snd_soc_component *scomp, int index,
 			  struct snd_soc_dapm_route *route)
@@ -3734,7 +3671,6 @@ static struct snd_soc_tplg_ops sof_tplg_ops = {
 
 	/* DAI link - used for any driver specific init */
 	.link_load	= sof_link_load,
-	.link_unload	= sof_link_unload,
 
 	/* completion - called at completion of firmware loading */
 	.complete	= sof_complete,