ALSA: firewire: simplify cleanup process when failing to register sound card

In former commits, .private_free callback releases resources just for
data transmission. This release function can be called without the
resources are actually allocated in error paths.

This commit applies a small refactoring to clean up codes in error
paths.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/bebob/bebob.c

@@ -126,8 +126,11 @@ end:
 	return err;
 }
 
-static void bebob_free(struct snd_bebob *bebob)
+static void
+bebob_card_free(struct snd_card *card)
 {
+	struct snd_bebob *bebob = card->private_data;
+
 	mutex_lock(&devices_mutex);
 	clear_bit(bebob->card_index, devices_used);
 	mutex_unlock(&devices_mutex);
@@ -135,18 +138,6 @@ static void bebob_free(struct snd_bebob *bebob)
 	snd_bebob_stream_destroy_duplex(bebob);
 }
 
-/*
- * This module releases the FireWire unit data after all ALSA character devices
- * are released by applications. This is for releasing stream data or finishing
- * transactions safely. Thus at returning from .remove(), this module still keep
- * references for the unit.
- */
-static void
-bebob_card_free(struct snd_card *card)
-{
-	bebob_free(card->private_data);
-}
-
 static const struct snd_bebob_spec *
 get_saffire_spec(struct fw_unit *unit)
 {
@@ -202,6 +193,9 @@ do_registration(struct work_struct *work)
 	set_bit(card_index, devices_used);
 	mutex_unlock(&devices_mutex);
 
+	bebob->card->private_free = bebob_card_free;
+	bebob->card->private_data = bebob;
+
 	err = name_device(bebob);
 	if (err < 0)
 		goto error;
@@ -241,17 +235,10 @@ do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	/*
-	 * After registered, bebob instance can be released corresponding to
-	 * releasing the sound card instance.
-	 */
-	bebob->card->private_free = bebob_card_free;
-	bebob->card->private_data = bebob;
 	bebob->registered = true;
 
 	return;
 error:
-	snd_bebob_stream_destroy_duplex(bebob);
 	snd_card_free(bebob->card);
 	dev_info(&bebob->unit->device,
 		 "Sound card registration failed: %d\n", err);

sound/firewire/dice/dice.c

@@ -122,21 +122,12 @@ static void dice_card_strings(struct snd_dice *dice)
 	strcpy(card->mixername, "DICE");
 }
 
-static void dice_free(struct snd_dice *dice)
-{
-	snd_dice_stream_destroy_duplex(dice);
-	snd_dice_transaction_destroy(dice);
-}
-
-/*
- * This module releases the FireWire unit data after all ALSA character devices
- * are released by applications. This is for releasing stream data or finishing
- * transactions safely. Thus at returning from .remove(), this module still keep
- * references for the unit.
- */
 static void dice_card_free(struct snd_card *card)
 {
-	dice_free(card->private_data);
+	struct snd_dice *dice = card->private_data;
+
+	snd_dice_stream_destroy_duplex(dice);
+	snd_dice_transaction_destroy(dice);
 }
 
 static void do_registration(struct work_struct *work)
@@ -151,6 +142,8 @@ static void do_registration(struct work_struct *work)
 			   &dice->card);
 	if (err < 0)
 		return;
+	dice->card->private_free = dice_card_free;
+	dice->card->private_data = dice;
 
 	err = snd_dice_transaction_init(dice);
 	if (err < 0)
@@ -188,19 +181,10 @@ static void do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	/*
-	 * After registered, dice instance can be released corresponding to
-	 * releasing the sound card instance.
-	 */
-	dice->card->private_free = dice_card_free;
-	dice->card->private_data = dice;
 	dice->registered = true;
 
 	return;
 error:
-	snd_dice_stream_destroy_duplex(dice);
-	snd_dice_transaction_destroy(dice);
-	snd_dice_stream_destroy_duplex(dice);
 	snd_card_free(dice->card);
 	dev_info(&dice->unit->device,
 		 "Sound card registration failed: %d\n", err);

sound/firewire/digi00x/digi00x.c

@@ -41,15 +41,12 @@ static int name_card(struct snd_dg00x *dg00x)
 	return 0;
 }
 
-static void dg00x_free(struct snd_dg00x *dg00x)
-{
-	snd_dg00x_stream_destroy_duplex(dg00x);
-	snd_dg00x_transaction_unregister(dg00x);
-}
-
 static void dg00x_card_free(struct snd_card *card)
 {
-	dg00x_free(card->private_data);
+	struct snd_dg00x *dg00x = card->private_data;
+
+	snd_dg00x_stream_destroy_duplex(dg00x);
+	snd_dg00x_transaction_unregister(dg00x);
 }
 
 static void do_registration(struct work_struct *work)
@@ -65,6 +62,8 @@ static void do_registration(struct work_struct *work)
 			   &dg00x->card);
 	if (err < 0)
 		return;
+	dg00x->card->private_free = dg00x_card_free;
+	dg00x->card->private_data = dg00x;
 
 	err = name_card(dg00x);
 	if (err < 0)
@@ -96,14 +95,10 @@ static void do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	dg00x->card->private_free = dg00x_card_free;
-	dg00x->card->private_data = dg00x;
 	dg00x->registered = true;
 
 	return;
 error:
-	snd_dg00x_transaction_unregister(dg00x);
-	snd_dg00x_stream_destroy_duplex(dg00x);
 	snd_card_free(dg00x->card);
 	dev_info(&dg00x->unit->device,
 		 "Sound card registration failed: %d\n", err);

sound/firewire/fireface/ff.c

@@ -27,15 +27,12 @@ static void name_card(struct snd_ff *ff)
 		 dev_name(&ff->unit->device), 100 << fw_dev->max_speed);
 }
 
-static void ff_free(struct snd_ff *ff)
-{
-	snd_ff_stream_destroy_duplex(ff);
-	snd_ff_transaction_unregister(ff);
-}
-
 static void ff_card_free(struct snd_card *card)
 {
-	ff_free(card->private_data);
+	struct snd_ff *ff = card->private_data;
+
+	snd_ff_stream_destroy_duplex(ff);
+	snd_ff_transaction_unregister(ff);
 }
 
 static void do_registration(struct work_struct *work)
@@ -50,6 +47,8 @@ static void do_registration(struct work_struct *work)
 			   &ff->card);
 	if (err < 0)
 		return;
+	ff->card->private_free = ff_card_free;
+	ff->card->private_data = ff;
 
 	err = snd_ff_transaction_register(ff);
 	if (err < 0)
@@ -79,14 +78,10 @@ static void do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	ff->card->private_free = ff_card_free;
-	ff->card->private_data = ff;
 	ff->registered = true;
 
 	return;
 error:
-	snd_ff_transaction_unregister(ff);
-	snd_ff_stream_destroy_duplex(ff);
 	snd_card_free(ff->card);
 	dev_info(&ff->unit->device,
 		 "Sound card registration failed: %d\n", err);

sound/firewire/fireworks/fireworks.c

@@ -184,8 +184,11 @@ end:
 	return err;
 }
 
-static void efw_free(struct snd_efw *efw)
+static void
+efw_card_free(struct snd_card *card)
 {
+	struct snd_efw *efw = card->private_data;
+
 	mutex_lock(&devices_mutex);
 	clear_bit(efw->card_index, devices_used);
 	mutex_unlock(&devices_mutex);
@@ -194,18 +197,6 @@ static void efw_free(struct snd_efw *efw)
 	snd_efw_transaction_remove_instance(efw);
 }
 
-/*
- * This module releases the FireWire unit data after all ALSA character devices
- * are released by applications. This is for releasing stream data or finishing
- * transactions safely. Thus at returning from .remove(), this module still keep
- * references for the unit.
- */
-static void
-efw_card_free(struct snd_card *card)
-{
-	efw_free(card->private_data);
-}
-
 static void
 do_registration(struct work_struct *work)
 {
@@ -236,6 +227,9 @@ do_registration(struct work_struct *work)
 	set_bit(card_index, devices_used);
 	mutex_unlock(&devices_mutex);
 
+	efw->card->private_free = efw_card_free;
+	efw->card->private_data = efw;
+
 	/* prepare response buffer */
 	snd_efw_resp_buf_size = clamp(snd_efw_resp_buf_size,
 				      SND_EFW_RESPONSE_MAXIMUM_BYTES, 4096U);
@@ -276,18 +270,10 @@ do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	/*
-	 * After registered, efw instance can be released corresponding to
-	 * releasing the sound card instance.
-	 */
-	efw->card->private_free = efw_card_free;
-	efw->card->private_data = efw;
 	efw->registered = true;
 
 	return;
 error:
-	snd_efw_transaction_remove_instance(efw);
-	snd_efw_stream_destroy_duplex(efw);
 	snd_card_free(efw->card);
 	dev_info(&efw->unit->device,
 		 "Sound card registration failed: %d\n", err);

sound/firewire/motu/motu.c

@@ -52,22 +52,12 @@ static void name_card(struct snd_motu *motu)
 		 dev_name(&motu->unit->device), 100 << fw_dev->max_speed);
 }
 
-static void motu_free(struct snd_motu *motu)
-{
-	snd_motu_transaction_unregister(motu);
-
-	snd_motu_stream_destroy_duplex(motu);
-}
-
-/*
- * This module releases the FireWire unit data after all ALSA character devices
- * are released by applications. This is for releasing stream data or finishing
- * transactions safely. Thus at returning from .remove(), this module still keep
- * references for the unit.
- */
 static void motu_card_free(struct snd_card *card)
 {
-	motu_free(card->private_data);
+	struct snd_motu *motu = card->private_data;
+
+	snd_motu_transaction_unregister(motu);
+	snd_motu_stream_destroy_duplex(motu);
 }
 
 static void do_registration(struct work_struct *work)
@@ -82,6 +72,8 @@ static void do_registration(struct work_struct *work)
 			   &motu->card);
 	if (err < 0)
 		return;
+	motu->card->private_free = motu_card_free;
+	motu->card->private_data = motu;
 
 	name_card(motu);
 
@@ -116,18 +108,10 @@ static void do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	/*
-	 * After registered, motu instance can be released corresponding to
-	 * releasing the sound card instance.
-	 */
-	motu->card->private_free = motu_card_free;
-	motu->card->private_data = motu;
 	motu->registered = true;
 
 	return;
 error:
-	snd_motu_transaction_unregister(motu);
-	snd_motu_stream_destroy_duplex(motu);
 	snd_card_free(motu->card);
 	dev_info(&motu->unit->device,
 		 "Sound card registration failed: %d\n", err);

sound/firewire/oxfw/oxfw.c

@@ -113,24 +113,15 @@ end:
 	return err;
 }
 
-static void oxfw_free(struct snd_oxfw *oxfw)
+static void oxfw_card_free(struct snd_card *card)
 {
+	struct snd_oxfw *oxfw = card->private_data;
+
 	snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
 	if (oxfw->has_output)
 		snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->tx_stream);
 }
 
-/*
- * This module releases the FireWire unit data after all ALSA character devices
- * are released by applications. This is for releasing stream data or finishing
- * transactions safely. Thus at returning from .remove(), this module still keep
- * references for the unit.
- */
-static void oxfw_card_free(struct snd_card *card)
-{
-	oxfw_free(card->private_data);
-}
-
 static int detect_quirks(struct snd_oxfw *oxfw)
 {
 	struct fw_device *fw_dev = fw_parent_device(oxfw->unit);
@@ -204,6 +195,8 @@ static void do_registration(struct work_struct *work)
 			   &oxfw->card);
 	if (err < 0)
 		return;
+	oxfw->card->private_free = oxfw_card_free;
+	oxfw->card->private_data = oxfw;
 
 	err = name_card(oxfw);
 	if (err < 0)
@@ -244,19 +237,10 @@ static void do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	/*
-	 * After registered, oxfw instance can be released corresponding to
-	 * releasing the sound card instance.
-	 */
-	oxfw->card->private_free = oxfw_card_free;
-	oxfw->card->private_data = oxfw;
 	oxfw->registered = true;
 
 	return;
 error:
-	snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
-	if (oxfw->has_output)
-		snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->tx_stream);
 	snd_card_free(oxfw->card);
 	dev_info(&oxfw->unit->device,
 		 "Sound card registration failed: %d\n", err);

sound/firewire/tascam/tascam.c

@@ -85,15 +85,12 @@ static int identify_model(struct snd_tscm *tscm)
 	return 0;
 }
 
-static void tscm_free(struct snd_tscm *tscm)
-{
-	snd_tscm_transaction_unregister(tscm);
-	snd_tscm_stream_destroy_duplex(tscm);
-}
-
 static void tscm_card_free(struct snd_card *card)
 {
-	tscm_free(card->private_data);
+	struct snd_tscm *tscm = card->private_data;
+
+	snd_tscm_transaction_unregister(tscm);
+	snd_tscm_stream_destroy_duplex(tscm);
 }
 
 static void do_registration(struct work_struct *work)
@@ -105,6 +102,8 @@ static void do_registration(struct work_struct *work)
 			   &tscm->card);
 	if (err < 0)
 		return;
+	tscm->card->private_free = tscm_card_free;
+	tscm->card->private_data = tscm;
 
 	err = identify_model(tscm);
 	if (err < 0)
@@ -136,18 +135,10 @@ static void do_registration(struct work_struct *work)
 	if (err < 0)
 		goto error;
 
-	/*
-	 * After registered, tscm instance can be released corresponding to
-	 * releasing the sound card instance.
-	 */
-	tscm->card->private_free = tscm_card_free;
-	tscm->card->private_data = tscm;
 	tscm->registered = true;
 
 	return;
 error:
-	snd_tscm_transaction_unregister(tscm);
-	snd_tscm_stream_destroy_duplex(tscm);
 	snd_card_free(tscm->card);
 	dev_info(&tscm->unit->device,
 		 "Sound card registration failed: %d\n", err);