ASoC: core: Bind DAIs to CODECs at registration time

We should always have a CODEC already there when registering a CODEC DAI
and for CODEC<->CODEC links a dai_link will have two CODECs so it's much
simpler to do things at registration time.

This results in a slight change in the error handling for failed CODEC
DAI registrations but practically speaking these are never supposed to
fail so there shouldn't be much issue. The change is that we don't fail
the overall CODEC registration if the DAI registration fails; this seems
more robust anyway as we may not need to use a given DAI in a particular
system.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-core.c

@@ -1196,7 +1196,6 @@ static int soc_probe_dai_link(struct snd_soc_card *card, int num, int order)
 			card->name, num, order);
 
 	/* config components */
-	codec_dai->codec = codec;
 	cpu_dai->platform = platform;
 	codec_dai->card = card;
 	cpu_dai->card = card;
@@ -3227,6 +3226,7 @@ static inline char *fmt_multiple_name(struct device *dev,
 int snd_soc_register_dai(struct device *dev,
 		struct snd_soc_dai_driver *dai_drv)
 {
+	struct snd_soc_codec *codec;
 	struct snd_soc_dai *dai;
 
 	dev_dbg(dev, "dai register %s\n", dev_name(dev));
@@ -3249,7 +3249,18 @@ int snd_soc_register_dai(struct device *dev,
 		dai->driver->ops = &null_dai_ops;
 
 	mutex_lock(&client_mutex);
+
+	list_for_each_entry(codec, &codec_list, list) {
+		if (codec->dev == dev) {
+			dev_dbg(dev, "Mapped DAI %s to CODEC %s\n",
+				dai->name, codec->name);
+			dai->codec = codec;
+			break;
+		}
+	}
+
 	list_add(&dai->list, &dai_list);
+
 	mutex_unlock(&client_mutex);
 
 	pr_debug("Registered DAI '%s'\n", dai->name);
@@ -3293,6 +3304,7 @@ EXPORT_SYMBOL_GPL(snd_soc_unregister_dai);
 int snd_soc_register_dais(struct device *dev,
 		struct snd_soc_dai_driver *dai_drv, size_t count)
 {
+	struct snd_soc_codec *codec;
 	struct snd_soc_dai *dai;
 	int i, ret = 0;
 
@@ -3325,7 +3337,18 @@ int snd_soc_register_dais(struct device *dev,
 			dai->driver->ops = &null_dai_ops;
 
 		mutex_lock(&client_mutex);
+
+		list_for_each_entry(codec, &codec_list, list) {
+			if (codec->dev == dev) {
+				dev_dbg(dev, "Mapped DAI %s to CODEC %s\n",
+					dai->name, codec->name);
+				dai->codec = codec;
+				break;
+			}
+		}
+
 		list_add(&dai->list, &dai_list);
+
 		mutex_unlock(&client_mutex);
 
 		pr_debug("Registered DAI '%s'\n", dai->name);
@@ -3537,17 +3560,18 @@ int snd_soc_register_codec(struct device *dev,
 		fixup_codec_formats(&dai_drv[i].capture);
 	}
 
+	mutex_lock(&client_mutex);
+	list_add(&codec->list, &codec_list);
+	mutex_unlock(&client_mutex);
+
 	/* register any DAIs */
 	if (num_dai) {
 		ret = snd_soc_register_dais(dev, dai_drv, num_dai);
 		if (ret < 0)
-			goto fail;
+			dev_err(codec->dev, "Failed to regster DAIs: %d\n",
+				ret);
 	}
 
-	mutex_lock(&client_mutex);
-	list_add(&codec->list, &codec_list);
-	mutex_unlock(&client_mutex);
-
 	pr_debug("Registered codec '%s'\n", codec->name);
 	return 0;