ASoC: soc-pcm: add soc_pcm_components_open()

soc-pcm.c has soc_pcm_components_close() but not have its open()
side function. This kind of unbalance function is very unreadable.

And, current error handling is not correct.
Because it is using for_each_rtdcom() loop, we need to call
soc_pcm_components_close() anyway even though
CPU DAI .startup() failed.

This patch adds soc_pcm_components_open(), and fixup error
handling issue.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-pcm.c

@@ -446,6 +446,42 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 	hw->rate_max = min_not_zero(hw->rate_max, rate_max);
 }
 
+static int soc_pcm_components_open(struct snd_pcm_substream *substream,
+				   struct snd_soc_component **last)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_rtdcom_list *rtdcom;
+	struct snd_soc_component *component;
+	int ret = 0;
+
+	for_each_rtdcom(rtd, rtdcom) {
+		component = rtdcom->component;
+		*last = component;
+
+		if (!component->driver->ops ||
+		    !component->driver->ops->open)
+			continue;
+
+		if (component->driver->module_get_upon_open &&
+		    !try_module_get(component->dev->driver->owner)) {
+			dev_err(component->dev,
+				"ASoC: can't get module %s\n",
+				component->name);
+			return -ENODEV;
+		}
+
+		ret = component->driver->ops->open(substream);
+		if (ret < 0) {
+			dev_err(component->dev,
+				"ASoC: can't open component %s: %d\n",
+				component->name, ret);
+			return ret;
+		}
+	}
+	*last = NULL;
+	return 0;
+}
+
 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
 				    struct snd_soc_component *last)
 {
@@ -510,28 +546,9 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 		}
 	}
 
-	for_each_rtdcom(rtd, rtdcom) {
-		component = rtdcom->component;
-
-		if (!component->driver->ops ||
-		    !component->driver->ops->open)
-			continue;
-
-		if (component->driver->module_get_upon_open &&
-		    !try_module_get(component->dev->driver->owner)) {
-			ret = -ENODEV;
-			goto module_err;
-		}
-
-		ret = component->driver->ops->open(substream);
-		if (ret < 0) {
-			dev_err(component->dev,
-				"ASoC: can't open component %s: %d\n",
-				component->name, ret);
-			goto component_err;
-		}
-	}
-	component = NULL;
+	ret = soc_pcm_components_open(substream, &component);
+	if (ret < 0)
+		goto component_err;
 
 	for_each_rtd_codec_dai(rtd, i, codec_dai) {
 		if (codec_dai->driver->ops->startup) {
@@ -638,7 +655,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 
 component_err:
 	soc_pcm_components_close(substream, component);
-module_err:
+
 	if (cpu_dai->driver->ops->shutdown)
 		cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 out: