[PATCH][RFC] ASoC: soc-component: count snd_soc_component_open/close()

[Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>]

ASoC component open/close and snd_soc_component_module_get/put are
called once for each component, but we need it for each substream.
To solve this issue, this patch counts open / get,
and call close / put accordingly.

Fixes: dd03907bf129 ("ASoC: soc-pcm: call snd_soc_component_open/close() once")
Reported-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
I tidyuped code.
I hope it can solve the issue.

 include/sound/soc-component.h |  5 +++--
 sound/soc/soc-component.c     | 35 ++++++++++++++++++++++-------------
 2 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/include/sound/soc-component.h b/include/sound/soc-component.h
index 1866ecc8e94b..4e78925858c0 100644
--- a/include/sound/soc-component.h
+++ b/include/sound/soc-component.h
@@ -181,10 +181,11 @@ struct snd_soc_component {
 	const char *debugfs_prefix;
 #endif
 
+	u8 opened;
+	u8 module;
+
 	/* bit field */
 	unsigned int suspended:1; /* is in suspend PM state */
-	unsigned int opened:1;
-	unsigned int module:1;
 };
 
 #define for_each_component_dais(component, dai)\
diff --git a/sound/soc/soc-component.c b/sound/soc/soc-component.c
index ee00c09df5e7..bdd36be1fb70 100644
--- a/sound/soc/soc-component.c
+++ b/sound/soc/soc-component.c
@@ -297,14 +297,16 @@ EXPORT_SYMBOL_GPL(snd_soc_component_set_jack);
 int snd_soc_component_module_get(struct snd_soc_component *component,
 				 int upon_open)
 {
-	if (component->module)
-		return 0;
+	if (unlikely(component->module == 0xff)) {
+		dev_warn(component->dev, "too many module get (%s)\n", component->name);
+		return -EBUSY;
+	}
 
 	if (component->driver->module_get_upon_open == !!upon_open &&
 	    !try_module_get(component->dev->driver->owner))
 		return -ENODEV;
 
-	component->module = 1;
+	component->module++;
 
 	return 0;
 }
@@ -312,11 +314,13 @@ int snd_soc_component_module_get(struct snd_soc_component *component,
 void snd_soc_component_module_put(struct snd_soc_component *component,
 				  int upon_open)
 {
-	if (component->module &&
-	    component->driver->module_get_upon_open == !!upon_open)
+	if (!component->module)
+		return;
+
+	if (component->driver->module_get_upon_open == !!upon_open)
 		module_put(component->dev->driver->owner);
 
-	component->module = 0;
+	component->module--;
 }
 
 int snd_soc_component_open(struct snd_soc_component *component,
@@ -324,12 +328,15 @@ int snd_soc_component_open(struct snd_soc_component *component,
 {
 	int ret = 0;
 
-	if (!component->opened &&
-	    component->driver->open)
+	if (unlikely(component->opened == 0xff)) {
+		dev_warn(component->dev, "too many open (%s)\n", component->name);
+		return -EBUSY;
+	}
+
+	if (component->driver->open)
 		ret = component->driver->open(component, substream);
 
-	if (ret == 0)
-		component->opened = 1;
+	component->opened++;
 
 	return ret;
 }
@@ -339,11 +346,13 @@ int snd_soc_component_close(struct snd_soc_component *component,
 {
 	int ret = 0;
 
-	if (component->opened &&
-	    component->driver->close)
+	if (!component->opened)
+		return;
+
+	if (component->driver->close)
 		ret = component->driver->close(component, substream);
 
-	component->opened = 0;
+	component->opened--;
 
 	return ret;
 }
-- 
2.17.1