ALSA: fireface: cease from delayed card registration

The delayed registration of sound card instance brings less benefit than
complication of kobject management. This commit ceases from it.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210607081250.13397-9-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/fireface/ff.c

@@ -42,22 +42,33 @@ static void ff_card_free(struct snd_card *card)
 
 	snd_ff_stream_destroy_duplex(ff);
 	snd_ff_transaction_unregister(ff);
+
+	mutex_destroy(&ff->mutex);
+	fw_unit_put(ff->unit);
 }
 
-static void do_registration(struct work_struct *work)
+static int snd_ff_probe(struct fw_unit *unit, const struct ieee1394_device_id *entry)
 {
-	struct snd_ff *ff = container_of(work, struct snd_ff, dwork.work);
+	struct snd_card *card;
+	struct snd_ff *ff;
 	int err;
 
-	if (ff->registered)
+	err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE, sizeof(*ff), &card);
-		return;
-
-	err = snd_card_new(&ff->unit->device, -1, NULL, THIS_MODULE, 0,
-			   &ff->card);
 	if (err < 0)
-		return;
+		return err;
-	ff->card->private_free = ff_card_free;
+	card->private_free = ff_card_free;
-	ff->card->private_data = ff;
+
+	ff = card->private_data;
+	ff->unit = fw_unit_get(unit);
+	dev_set_drvdata(&unit->device, ff);
+	ff->card = card;
+
+	mutex_init(&ff->mutex);
+	spin_lock_init(&ff->lock);
+	init_waitqueue_head(&ff->hwdep_wait);
+
+	ff->unit_version = entry->version;
+	ff->spec = (const struct snd_ff_spec *)entry->driver_data;
 
 	err = snd_ff_transaction_register(ff);
 	if (err < 0)
@@ -83,76 +94,31 @@ static void do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	err = snd_card_register(ff->card);
+	err = snd_card_register(card);
 	if (err < 0)
 		goto error;
 
-	ff->registered = true;
-
-	return;
-error:
-	snd_card_free(ff->card);
-	dev_info(&ff->unit->device,
-		 "Sound card registration failed: %d\n", err);
-}
-
-static int snd_ff_probe(struct fw_unit *unit,
-			   const struct ieee1394_device_id *entry)
-{
-	struct snd_ff *ff;
-
-	ff = devm_kzalloc(&unit->device, sizeof(struct snd_ff), GFP_KERNEL);
-	if (!ff)
-		return -ENOMEM;
-	ff->unit = fw_unit_get(unit);
-	dev_set_drvdata(&unit->device, ff);
-
-	mutex_init(&ff->mutex);
-	spin_lock_init(&ff->lock);
-	init_waitqueue_head(&ff->hwdep_wait);
-
-	ff->unit_version = entry->version;
-	ff->spec = (const struct snd_ff_spec *)entry->driver_data;
-
-	/* Register this sound card later. */
-	INIT_DEFERRABLE_WORK(&ff->dwork, do_registration);
-	snd_fw_schedule_registration(unit, &ff->dwork);
-
 	return 0;
+error:
+	snd_card_free(card);
+	return err;
 }
 
 static void snd_ff_update(struct fw_unit *unit)
 {
 	struct snd_ff *ff = dev_get_drvdata(&unit->device);
 
-	/* Postpone a workqueue for deferred registration. */
-	if (!ff->registered)
-		snd_fw_schedule_registration(unit, &ff->dwork);
-
 	snd_ff_transaction_reregister(ff);
 
-	if (ff->registered)
+	snd_ff_stream_update_duplex(ff);
-		snd_ff_stream_update_duplex(ff);
 }
 
 static void snd_ff_remove(struct fw_unit *unit)
 {
 	struct snd_ff *ff = dev_get_drvdata(&unit->device);
 
-	/*
+	// Block till all of ALSA character devices are released.
-	 * Confirm to stop the work for registration before the sound card is
+	snd_card_free(ff->card);
-	 * going to be released. The work is not scheduled again because bus
-	 * reset handler is not called anymore.
-	 */
-	cancel_work_sync(&ff->dwork.work);
-
-	if (ff->registered) {
-		// Block till all of ALSA character devices are released.
-		snd_card_free(ff->card);
-	}
-
-	mutex_destroy(&ff->mutex);
-	fw_unit_put(ff->unit);
 }
 
 static const struct snd_ff_spec spec_ff800 = {

sound/firewire/fireface/ff.h

@@ -69,9 +69,6 @@ struct snd_ff {
 	struct mutex mutex;
 	spinlock_t lock;
 
-	bool registered;
-	struct delayed_work dwork;
-
 	enum snd_ff_unit_version unit_version;
 	const struct snd_ff_spec *spec;