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ALSA: usb-audio: Clean up endpoint setups at PCM prepare 

This patch cleans up the superfluous checks and calls for setting up
the endpoints at PCM prepare callback:

- Drop stop_endpoints() and sync_pending_stops() calls; the stream is
  guaranteed to have been already stopped and synced at each PCM
  prepare call by ALSA PCM core

- Call snd_usb_endpoint_prepare() unconditionally;
  the check for endpoint->need_setup is done in
  snd_pcm_hw_endpoint_prepare() itself

- Apply snd_usb_set_format_quirk() only when the endpoint is actually
  set up (i.e. the return code from snd_usb_endpoint_prepare() > 0)

- Move a few lines back into snd_usb_pcm_prepare();
  it's even easier to follow than a small useless function

Link: https://lore.kernel.org/r/20220901130831.6136-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2022-09-01 15:08:31 +02:00
parent 041af76890
commit 32eeeed963
1 changed files with 10 additions and 30 deletions
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40
sound/usb/pcm.c
View File

@ -433,35 +433,6 @@ static void close_endpoints(struct snd_usb_audio *chip,
}
}
static int configure_endpoints(struct snd_usb_audio *chip,
struct snd_usb_substream *subs)
{
int err;
if (subs->data_endpoint->need_setup) {
/* stop any running stream beforehand */
if (stop_endpoints(subs, false))
sync_pending_stops(subs);
if (subs->sync_endpoint) {
err = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
if (err < 0)
return err;
}
err = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
if (err < 0)
return err;
snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
} else {
if (subs->sync_endpoint) {
err = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
if (err < 0)
return err;
}
}
return 0;
}
/*
* hw_params callback
*
@ -640,9 +611,18 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
goto unlock;
}
ret = configure_endpoints(chip, subs);
if (subs->sync_endpoint) {
ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
if (ret < 0)
goto unlock;
}
ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
if (ret < 0)
goto unlock;
else if (ret > 0)
snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
ret = 0;
/* reset the pointer */
subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);