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 bebob 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: ac2888b958f2 ("ALSA: bebob: configure sampling transfer frequency in pcm.hw_params callback") Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/bebob/bebob_midi.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/firewire/bebob/bebob_midi.c b/sound/firewire/bebob/bebob_midi.c index f7db1f7bce86..f903271e93d0 100644 --- a/sound/firewire/bebob/bebob_midi.c +++ b/sound/firewire/bebob/bebob_midi.c @@ -22,6 +22,8 @@ static int midi_open(struct snd_rawmidi_substream *substream) if (err >= 0) { ++bebob->substreams_counter; err = snd_bebob_stream_start_duplex(bebob); + if (err < 0) + --bebob->substreams_counter; } mutex_unlock(&bebob->mutex); if (err < 0)