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

From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
To: clemens@ladisch.de, tiwai@suse.de
Cc: alsa-devel@alsa-project.org, ffado-devel@lists.sf.net
Subject: [PATCH 05/25] ALSA: firewire-lib: schedule tasklet again when MIDI substream has rest of MIDI messages
Date: Sat, 22 Aug 2015 18:19:21 +0900	[thread overview]
Message-ID: <1440235181-18181-6-git-send-email-o-takashi@sakamocchi.jp> (raw)
In-Reply-To: <1440235181-18181-1-git-send-email-o-takashi@sakamocchi.jp>

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@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 9da8894..83d20b6 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
