diff options
| author | Stefan Sauer <[email protected]> | 2022-01-06 13:41:45 +0100 |
|---|---|---|
| committer | Takashi Iwai <[email protected]> | 2022-01-06 16:08:07 +0100 |
| commit | 7560ee032b3f87fa5c4f03e99a064c6cd326951e (patch) | |
| tree | 17bdba5018a5731faecc565b2bebc39cbf312273 | |
| parent | b81e9e5c723de936652653241d3dc4f33ae05e8c (diff) | |
ALSA: seq: virmidi: Add a drain operation
If a driver does not supply a drain operation for outputs, a default code
path will execute msleep(50). Especially for a virtual midi device
this severely limmits the throughput.
This implementation for the virtual midi driver simply flushes the output
workqueue.
Signed-off-by: Stefan Sauer <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>
| -rw-r--r-- | sound/core/seq/seq_virmidi.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sound/core/seq/seq_virmidi.c b/sound/core/seq/seq_virmidi.c index 4abc38c70cae..f5cae49500c8 100644 --- a/sound/core/seq/seq_virmidi.c +++ b/sound/core/seq/seq_virmidi.c @@ -263,6 +263,16 @@ static int snd_virmidi_output_close(struct snd_rawmidi_substream *substream) } /* + * drain output work queue + */ +static void snd_virmidi_output_drain(struct snd_rawmidi_substream *substream) +{ + struct snd_virmidi *vmidi = substream->runtime->private_data; + + flush_work(&vmidi->output_work); +} + +/* * subscribe callback - allow output to rawmidi device */ static int snd_virmidi_subscribe(void *private_data, @@ -336,6 +346,7 @@ static const struct snd_rawmidi_ops snd_virmidi_output_ops = { .open = snd_virmidi_output_open, .close = snd_virmidi_output_close, .trigger = snd_virmidi_output_trigger, + .drain = snd_virmidi_output_drain, }; /* |