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ALSA: firewire-lib: schedule work again when MIDI substream has rest of MIDI messages

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Currently, when two MIDI trigger callbacks can be called immediately,
transactions for the second MIDI messages can be postpone till next trigger
callback. This is not good for real-time message transmission.

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

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2015-10-09 08:10:27 +09:00 committed by Takashi Iwai
parent d3ef9cb93a
commit e8a40d9bcb
1 changed files with 3 additions and 0 deletions
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3
sound/firewire/lib.c
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@ -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))
schedule_work(&port->work);
}
static void midi_port_work(struct work_struct *work)