[ALSA] hda-codec - Prepare unsol workqueue on demand

Modules: HDA Codec driver

Prepare unsol workqueue only when a codec really supports.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -288,6 +288,9 @@ static int init_unsol_queue(struct hda_bus *bus)
 {
 	struct hda_bus_unsolicited *unsol;
 
+	if (bus->unsol) /* already initialized */
+		return 0;
+
 	unsol = kzalloc(sizeof(*unsol), GFP_KERNEL);
 	if (! unsol) {
 		snd_printk(KERN_ERR "hda_codec: can't allocate unsolicited queue\n");
@@ -373,8 +376,6 @@ int snd_hda_bus_new(snd_card_t *card, const struct hda_bus_template *temp,
 	init_MUTEX(&bus->cmd_mutex);
 	INIT_LIST_HEAD(&bus->codec_list);
 
-	init_unsol_queue(bus);
-
 	if ((err = snd_device_new(card, SNDRV_DEV_BUS, bus, &dev_ops)) < 0) {
 		snd_hda_bus_free(bus);
 		return err;
@@ -540,6 +541,9 @@ int snd_hda_codec_new(struct hda_bus *bus, unsigned int codec_addr,
 		return err;
 	}
 
+	if (codec->patch_ops.unsol_event)
+		init_unsol_queue(bus);
+
 	snd_hda_codec_proc_new(codec);
 
 	sprintf(component, "HDA:%08x", codec->vendor_id);