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ALSA: seq: virmidi: Add a drain operation

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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 <st_kost@gmx.de>
Link: https://lore.kernel.org/r/20220106124145.17254-1-st_kost@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Stefan Sauer 2022-01-06 13:41:45 +01:00 • committed by Takashi Iwai
parent b81e9e5c72
commit 7560ee032b
1 changed files with 11 additions and 0 deletions
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11
sound/core/seq/seq_virmidi.c
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@ -262,6 +262,16 @@ static int snd_virmidi_output_close(struct snd_rawmidi_substream *substream)
return 0;
}
/*
* 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
*/
@ -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,
};
/*