In IEC 61883-6, several types of sampling data can be multiplexed into payload of common isochronous packet (CIP). For typical audio and music units, PCM samples and MIDI messages are multiplexed into one packet streaming.
ALSA firewire-motu driver allows applications of rawmidi interface to start packet streaming for transmission of MIDI messages. However at error path, the reference count of stream functionality is not operated correctly. This can brings a bug that packet streaming is not stopped when all referrers release the count.
This commit fixes the bug.
Fixes: 8edc56ec8f14 ("ALSA: firewire-motu: reserve/release isochronous resources in pcm.hw_params/hw_free callbacks") Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/motu/motu-midi.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/firewire/motu/motu-midi.c b/sound/firewire/motu/motu-midi.c index 4520c0060b83..5c77e417c627 100644 --- a/sound/firewire/motu/motu-midi.c +++ b/sound/firewire/motu/motu-midi.c @@ -22,6 +22,8 @@ static int midi_open(struct snd_rawmidi_substream *substream) if (err >= 0) { ++motu->substreams_counter; err = snd_motu_stream_start_duplex(motu); + if (err < 0) + --motu->substreams_counter; }
mutex_unlock(&motu->mutex);