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| author | Takashi Iwai <tiwai@suse.de> | 2014-11-07 17:08:28 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2014-11-09 18:20:40 +0100 |
| commit | 1fb8510cdb5b7befe8a59f533c7fc12ef0dac73e (patch) | |
| tree | b44569425ea7683d02893cfd145081a11d7677f1 /sound/core | |
| parent | 31584ed18c073176a7ad96ddbfd09765e21e813d (diff) | |
| download | linux-1fb8510cdb5b7befe8a59f533c7fc12ef0dac73e.tar.bz2 | |
ALSA: pcm: Add snd_pcm_stop_xrun() helper
Add a new helper function snd_pcm_stop_xrun() to the standard sequnce
lock/snd_pcm_stop(XRUN)/unlock by a single call, and replace the
existing open codes with this helper.
The function checks the PCM running state to prevent setting the wrong
state, too, for more safety.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/pcm_native.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index dfb5031969f8..a3d122109704 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -1098,6 +1098,29 @@ int snd_pcm_drain_done(struct snd_pcm_substream *substream) SNDRV_PCM_STATE_SETUP); } +/** + * snd_pcm_stop_xrun - stop the running streams as XRUN + * @substream: the PCM substream instance + * @state: PCM state after stopping the stream + * + * This stops the given running substream (and all linked substreams) as XRUN. + * Unlike snd_pcm_stop(), this function takes the substream lock by itself. + * + * Return: Zero if successful, or a negative error code. + */ +int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) +{ + unsigned long flags; + int ret = 0; + + snd_pcm_stream_lock_irqsave(substream, flags); + if (snd_pcm_running(substream)) + ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); + snd_pcm_stream_unlock_irqrestore(substream, flags); + return ret; +} +EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); + /* * pause callbacks */ |