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ALSA: rawmidi: A lightweight function to discard pending bytes

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For discarding the pending bytes on rawmidi, we process with a loop of
snd_rawmidi_transmit() which is just a waste of CPU power.
Implement a lightweight API function to discard the pending bytes and
the proceed the ring buffer instantly, and use it instead of open
codes.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2018-09-13 08:20:43 +02:00
parent cd3b7116b5
commit 6aea5702e2
4 changed files with 25 additions and 5 deletions
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include/sound/rawmidi.h
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@@ -171,6 +171,7 @@ int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
unsigned char *buffer, int count);
int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
int count);
int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream);
/* main midi functions */