ASoC: core: ensure component names are unique

Make sure each ASoC component is registered with a unique name.
The component is derived from the device name. If a device registers more
than one component, the component names will be the same.

This usually brings up a warning about the debugfs directory creation of
the component since directory already exists.

In such case, start numbering the component of the device so the names
don't collide anymore.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20200214134704.342501-1-jbrunet@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -2446,6 +2446,33 @@ static int snd_soc_register_dais(struct snd_soc_component *component,
 	return ret;
 }
 
+static char *snd_soc_component_unique_name(struct device *dev,
+					   struct snd_soc_component *component)
+{
+	struct snd_soc_component *pos;
+	int count = 0;
+	char *name, *unique;
+
+	name = fmt_single_name(dev, &component->id);
+	if (!name)
+		return name;
+
+	/* Count the number of components registred by the device */
+	for_each_component(pos) {
+		if (dev == pos->dev)
+			count++;
+	}
+
+	/* Keep naming as it is for the 1st component */
+	if (!count)
+		return name;
+
+	unique = devm_kasprintf(dev, GFP_KERNEL, "%s-%d", name, count);
+	devm_kfree(dev, name);
+
+	return unique;
+}
+
 static int snd_soc_component_initialize(struct snd_soc_component *component,
 	const struct snd_soc_component_driver *driver, struct device *dev)
 {
@@ -2454,7 +2481,7 @@ static int snd_soc_component_initialize(struct snd_soc_component *component,
 	INIT_LIST_HEAD(&component->card_list);
 	mutex_init(&component->io_mutex);
 
-	component->name = fmt_single_name(dev, &component->id);
+	component->name = snd_soc_component_unique_name(dev, component);
 	if (!component->name) {
 		dev_err(dev, "ASoC: Failed to allocate name\n");
 		return -ENOMEM;