1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index 37c2e19c3b00..ea69d5862f6d 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -1894,6 +1894,10 @@ open_dchannel(struct hfc_pci *hc, struct mISDNchannel *ch,
                     hc->dch.dev.id, __builtin_return_address(0));
         if (rq->protocol == ISDN_P_NONE)
                 return -EINVAL;
+        if (rq->adr.channel == 1) {
+                /* TODO: E-Channel */
+                return -EINVAL;
+        }
         if (!hc->initdone) {
                 if (rq->protocol == ISDN_P_TE_S0) {
                         err = create_l1(&hc->dch, hfc_l1callback);