[alsa-devel] [PATCH 05/25] ALSA: firewire-lib: schedule tasklet again when MIDI substream has rest of MIDI messages

[Takashi Sakamoto]

When two MIDI trigger callbacks can be called immediately, transactions
for the second MIDI messages can be postpone till next trigger callback.

This commit schedules tasklet again at response handling callback if the
MIDI substream still includes untransferred MIDI messages.

Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
 sound/firewire/lib.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/firewire/lib.c b/sound/firewire/lib.c
index a66e011..e309b9b 100644
--- a/sound/firewire/lib.c
+++ b/sound/firewire/lib.c
@@ -78,6 +78,9 @@ static void async_midi_port_callback(struct fw_card *card, int rcode,
 		snd_rawmidi_transmit_ack(substream, port->consume_bytes);
 
 	port->idling = true;
+
+	if (!snd_rawmidi_transmit_empty(substream))
+		tasklet_schedule(&port->tasklet);
 }
 
 static void midi_port_tasklet(unsigned long data)
-- 
2.1.4