[PATCH] Generic HDLC WAN drivers - disable netif_carrier_off()

As we are currently unable to fix the problem with carrier and protocol
state signaling in net core I've to disable netif_carrier_off() calls
used by WAN protocol drivers. The attached patch should make them
working again.

The remaining netif_carrier_*() calls in hdlc_fr.c are fine as they
don't touch the physical device.
Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/net/wan/hdlc_cisco.c

@@ -192,7 +192,9 @@ static int cisco_rx(struct sk_buff *skb)
 					       "uptime %ud%uh%um%us)\n",
 					       dev->name, days, hrs,
 					       min, sec);
+#if 0
 					netif_carrier_on(dev);
+#endif
 					hdlc->state.cisco.up = 1;
 				}
 			}
@@ -225,7 +227,9 @@ static void cisco_timer(unsigned long arg)
 		       hdlc->state.cisco.settings.timeout * HZ)) {
 		hdlc->state.cisco.up = 0;
 		printk(KERN_INFO "%s: Link down\n", dev->name);
+#if 0
 		netif_carrier_off(dev);
+#endif
 	}
 
 	cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ,
@@ -261,8 +265,10 @@ static void cisco_stop(struct net_device *dev)
 {
 	hdlc_device *hdlc = dev_to_hdlc(dev);
 	del_timer_sync(&hdlc->state.cisco.timer);
+#if 0
 	if (netif_carrier_ok(dev))
 		netif_carrier_off(dev);
+#endif
 	hdlc->state.cisco.up = 0;
 	hdlc->state.cisco.request_sent = 0;
 }

drivers/net/wan/hdlc_fr.c

@@ -545,8 +545,10 @@ static void fr_set_link_state(int reliable, struct net_device *dev)
 
 	hdlc->state.fr.reliable = reliable;
 	if (reliable) {
+#if 0
 		if (!netif_carrier_ok(dev))
 			netif_carrier_on(dev);
+#endif
 
 		hdlc->state.fr.n391cnt = 0; /* Request full status */
 		hdlc->state.fr.dce_changed = 1;
@@ -560,8 +562,10 @@ static void fr_set_link_state(int reliable, struct net_device *dev)
 			}
 		}
 	} else {
+#if 0
 		if (netif_carrier_ok(dev))
 			netif_carrier_off(dev);
+#endif
 
 		while (pvc) {		/* Deactivate all PVCs */
 			pvc_carrier(0, pvc);

drivers/net/wan/hdlc_generic.c

@@ -79,11 +79,13 @@ static void __hdlc_set_carrier_on(struct net_device *dev)
 	hdlc_device *hdlc = dev_to_hdlc(dev);
 	if (hdlc->proto.start)
 		return hdlc->proto.start(dev);
+#if 0
 #ifdef DEBUG_LINK
 	if (netif_carrier_ok(dev))
 		printk(KERN_ERR "hdlc_set_carrier_on(): already on\n");
 #endif
 	netif_carrier_on(dev);
+#endif
 }
 
 
@@ -94,11 +96,13 @@ static void __hdlc_set_carrier_off(struct net_device *dev)
 	if (hdlc->proto.stop)
 		return hdlc->proto.stop(dev);
 
+#if 0
 #ifdef DEBUG_LINK
 	if (!netif_carrier_ok(dev))
 		printk(KERN_ERR "hdlc_set_carrier_off(): already off\n");
 #endif
 	netif_carrier_off(dev);
+#endif
 }
 
 
@@ -294,8 +298,10 @@ int register_hdlc_device(struct net_device *dev)
 	if (result != 0)
 		return -EIO;
 
+#if 0
 	if (netif_carrier_ok(dev))
 		netif_carrier_off(dev); /* no carrier until DCD goes up */
+#endif
 
 	return 0;
 }