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[ALSA] pcm - NULL check in snd_pcm_suspend*()

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Modules: PCM Midlevel

Add NULL check in snd_pcm_suspend*() so that the caller doesn't have to do it
by itself.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2005-11-17 15:59:14 +01:00 committed by Jaroslav Kysela
parent a381a7a664
commit 603bf524aa
1 changed files with 6 additions and 0 deletions
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6
sound/core/pcm_native.c
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@ -1073,6 +1073,9 @@ int snd_pcm_suspend(struct snd_pcm_substream *substream)
int err; int err;
unsigned long flags; unsigned long flags;
if (! substream)
return 0;
snd_pcm_stream_lock_irqsave(substream, flags); snd_pcm_stream_lock_irqsave(substream, flags);
err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
snd_pcm_stream_unlock_irqrestore(substream, flags); snd_pcm_stream_unlock_irqrestore(substream, flags);
@ -1091,6 +1094,9 @@ int snd_pcm_suspend_all(struct snd_pcm *pcm)
struct snd_pcm_substream *substream; struct snd_pcm_substream *substream;
int stream, err = 0; int stream, err = 0;
if (! pcm)
return 0;
for (stream = 0; stream < 2; stream++) { for (stream = 0; stream < 2; stream++) {
for (substream = pcm->streams[stream].substream; for (substream = pcm->streams[stream].substream;
substream; substream = substream->next) { substream; substream = substream->next) {