X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=sound%2Fisa%2Fgus%2Fgus_pcm.c;fp=sound%2Fisa%2Fgus%2Fgus_pcm.c;h=d0829393ec8a21b6ad0a3d8589ab5b417724086f;hb=64ba3f394c830ec48a1c31b53dcae312c56f1604;hp=c7f95e7aa018513be58cc557a6a984369085bf6e;hpb=be1e6109ac94a859551f8e1774eb9a8469fe055c;p=linux-2.6.git

diff --git a/sound/isa/gus/gus_pcm.c b/sound/isa/gus/gus_pcm.c
index c7f95e7aa..d0829393e 100644
--- a/sound/isa/gus/gus_pcm.c
+++ b/sound/isa/gus/gus_pcm.c
@@ -114,6 +114,8 @@ static void snd_gf1_pcm_trigger_up(struct snd_pcm_substream *substream)
 	unsigned char pan;
 	unsigned int voice;
 
+	if (substream == NULL)
+		return;
 	spin_lock_irqsave(&pcmp->lock, flags);
 	if (pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE) {
 		spin_unlock_irqrestore(&pcmp->lock, flags);