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-rw-r--r--drivers/isdn/mISDN/stack.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/isdn/mISDN/stack.c b/drivers/isdn/mISDN/stack.c
index 3e1532a180ff..0d05ec43012c 100644
--- a/drivers/isdn/mISDN/stack.c
+++ b/drivers/isdn/mISDN/stack.c
@@ -364,7 +364,7 @@ add_layer2(struct mISDNchannel *ch, struct mISDNstack *st)
static int
st_own_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
{
- if (!ch->st || ch->st->layer1)
+ if (!ch->st || !ch->st->layer1)
return -EINVAL;
return ch->st->layer1->ctrl(ch->st->layer1, cmd, arg);
}