ASoC: soc-core: add soc_unbind_dai_link()

It is easy to read code if it is cleanly using paired function/naming,
like start <-> stop, register <-> unregister, etc, etc.
But, current ALSA SoC code is very random, unbalance, not paired, etc.
It is easy to create bug at the such code, and it will be difficult to
debug.

ALSA SoC has soc_bind_dai_link(), but its paired soc_unbind_dai_link()
is not implemented.
More confusable is that soc_remove_pcm_runtimes() which should be
soc_unbind_dai_link() is implemented without synchronised
to soc_bind_dai_link().

This patch cleanup this unbalance.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/877e4e3jni.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -470,14 +470,6 @@ static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
 	return NULL;
 }
 
-static void soc_remove_pcm_runtimes(struct snd_soc_card *card)
-{
-	struct snd_soc_pcm_runtime *rtd, *_rtd;
-
-	for_each_card_rtds_safe(card, rtd, _rtd)
-		soc_free_pcm_runtime(rtd);
-}
-
 struct snd_soc_pcm_runtime *snd_soc_get_pcm_runtime(struct snd_soc_card *card,
 		const char *dai_link)
 {
@@ -1037,6 +1029,16 @@ static int soc_dai_link_sanity_check(struct snd_soc_card *card,
 	return 0;
 }
 
+static void soc_unbind_dai_link(struct snd_soc_card *card,
+				struct snd_soc_dai_link *dai_link)
+{
+	struct snd_soc_pcm_runtime *rtd;
+
+	rtd = snd_soc_get_pcm_runtime(card, dai_link->name);
+	if (rtd)
+		soc_free_pcm_runtime(rtd);
+}
+
 static int soc_bind_dai_link(struct snd_soc_card *card,
 	struct snd_soc_dai_link *dai_link)
 {
@@ -1466,6 +1468,8 @@ void snd_soc_remove_dai_link(struct snd_soc_card *card,
 		card->remove_dai_link(card, dai_link);
 
 	list_del(&dai_link->list);
+
+	soc_unbind_dai_link(card, dai_link);
 }
 EXPORT_SYMBOL_GPL(snd_soc_remove_dai_link);
 
@@ -1974,8 +1978,6 @@ static void soc_cleanup_card_resources(struct snd_soc_card *card)
 	for_each_card_links_safe(card, link, _link)
 		snd_soc_remove_dai_link(card, link);
 
-	soc_remove_pcm_runtimes(card);
-
 	/* remove auxiliary devices */
 	soc_remove_aux_devices(card);
 	soc_unbind_aux_dev(card);