ALSA: firewire-tascam: initialize parameters at open of rawmidi character devices

In current design of ALSA driver for TASCAM FireWire series, initialization
of members in asymc midi port structure is done at device probing. Some of
the members should be initialized every time to use rawmidi devices because
they're changed in sequence of transmission for MIDI messages.

This commit adds a new function to initialize them. Invariant parameters
during object lifetime are kept as is.

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

1 files changed, 4 insertions, 12 deletions

diff --git a/sound/firewire/tascam/tascam-transaction.c b/sound/firewire/tascam/tascam-transaction.c
index 248afe663387..a248a4ae0353 100644
--- a/sound/firewire/tascam/tascam-transaction.c
+++ b/sound/firewire/tascam/tascam-transaction.c
@@ -236,17 +236,10 @@ static void midi_port_work(struct work_struct *work)
 			port);
 }
 
-int snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port,
-		struct fw_unit *unit)
+void snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port)
 {
-	port->parent = fw_parent_device(unit);
 	port->idling = true;
-	port->next_ktime = 0;
 	port->error = false;
-
-	INIT_WORK(&port->work, midi_port_work);
-
-	return 0;
 }
 
 static void handle_midi_tx(struct fw_card *card, struct fw_request *request,
@@ -324,10 +317,9 @@ int snd_tscm_transaction_register(struct snd_tscm *tscm)
 		goto error;
 
 	for (i = 0; i < TSCM_MIDI_OUT_PORT_MAX; i++) {
-		err = snd_fw_async_midi_port_init(
-				&tscm->out_ports[i], tscm->unit);
-		if (err < 0)
-			goto error;
+		tscm->out_ports[i].parent = fw_parent_device(tscm->unit);
+		tscm->out_ports[i].next_ktime = 0;
+		INIT_WORK(&tscm->out_ports[i].work, midi_port_work);
 	}
 
 	return err;