ALSA: hda - Embed struct hda_bus_unsolicited into struct hda_bus

There is no big merit to handle hda_bus_unsolicited object
individually, as it's tightly coupled with the hda_bus object itself.
Embedding it makes the code simpler in the end.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.h

@@ -66,7 +66,6 @@ struct hda_beep;
 struct hda_codec;
 struct hda_pcm;
 struct hda_pcm_stream;
-struct hda_bus_unsolicited;
 
 /* NID type */
 typedef u16 hda_nid_t;
@@ -101,6 +100,16 @@ struct hda_bus_ops {
 #endif
 };
 
+/* unsolicited event handler */
+#define HDA_UNSOL_QUEUE_SIZE	64
+struct hda_bus_unsolicited {
+	/* ring buffer */
+	u32 queue[HDA_UNSOL_QUEUE_SIZE * 2];
+	unsigned int rp, wp;
+	/* workqueue */
+	struct work_struct work;
+};
+
 /*
  * codec bus
  *
@@ -126,7 +135,7 @@ struct hda_bus {
 	struct mutex prepare_mutex;
 
 	/* unsolicited event queue */
-	struct hda_bus_unsolicited *unsol;
+	struct hda_bus_unsolicited unsol;
 	char workq_name[16];
 	struct workqueue_struct *workq;	/* common workqueue for codecs */