ALSA: hda: Initialize ext-bus-specific fields in snd_hdac_bus_init(), too

Some fields in snd_hdac_bus are ext-bus specific, but they still
should be initialized in snd_hdac_bus_init() for consistency, at
least, for the ones that do need the explicit initialization like the
list head.

Also move the lock field to the more appropriate place and correct the
comment to reflect the recent change where it serves for both the
display power and the link management.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hdaudio.h

@@ -297,7 +297,7 @@ struct hdac_rb {
  * @num_streams: streams supported
  * @idx: HDA link index
  * @hlink_list: link list of HDA links
- * @lock: lock for link mgmt
+ * @lock: lock for link and display power mgmt
  * @cmd_dma_state: state of cmd DMAs: CORB and RIRB
  */
 struct hdac_bus {
@@ -363,6 +363,7 @@ struct hdac_bus {
 	/* locks */
 	spinlock_t reg_lock;
 	struct mutex cmd_mutex;
+	struct mutex lock;
 
 	/* DRM component interface */
 	struct drm_audio_component *audio_component;
@@ -373,11 +374,9 @@ struct hdac_bus {
 	int num_streams;
 	int idx;
 
+	/* link management */
 	struct list_head hlink_list;
-
-	struct mutex lock;
 	bool cmd_dma_state;
-
 };
 
 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,

sound/hda/ext/hdac_ext_bus.c

@@ -104,9 +104,7 @@ int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
 		return ret;
 
 	bus->ext_ops = ext_ops;
-	INIT_LIST_HEAD(&bus->hlink_list);
 	bus->idx = idx++;
-
 	bus->cmd_dma_state = true;
 
 	return 0;

sound/hda/hdac_bus.c

@@ -39,6 +39,7 @@ int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
 	spin_lock_init(&bus->reg_lock);
 	mutex_init(&bus->cmd_mutex);
 	mutex_init(&bus->lock);
+	INIT_LIST_HEAD(&bus->hlink_list);
 	bus->irq = -1;
 	return 0;
 }