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

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>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 263c01a70fdd..7bac1cbe38da 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1073,6 +1073,9 @@ int snd_pcm_suspend(struct snd_pcm_substream *substream)
         int err;
         unsigned long flags;
 
+        if (! substream)
+                return 0;
+
         snd_pcm_stream_lock_irqsave(substream, flags);
         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
         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;
         int stream, err = 0;
 
+        if (! pcm)
+                return 0;
+
         for (stream = 0; stream < 2; stream++) {
                 for (substream = pcm->streams[stream].substream;
                      substream; substream = substream->next) {