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Commit 2f8364a2 authored by Andrew Lunn's avatar Andrew Lunn Committed by David S. Miller
Browse files

WAN: HDLC: Call notifiers before and after changing device type 



An HDLC device can change type when the protocol driver is changed.
Calling the notifier change allows potential users of the interface
know about this planned change, and even block it. After the change
has occurred, send a second notification to users can evaluate the new
device type etc.

Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ff351644

drivers/net/wan/hdlc.c

+17 −2
Original line number Diff line number Diff line
@@ -276,7 +276,11 @@ void unregister_hdlc_device(struct net_device *dev) 
int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto,

			 size_t size)

{

	detach_hdlc_protocol(dev);

	int err;



	err = detach_hdlc_protocol(dev);

	if (err)

		return err;



	if (!try_module_get(proto->module))

		return -ENOSYS;
@@ -289,15 +293,24 @@ int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto, 
		}

	}

	dev_to_hdlc(dev)->proto = proto;



	return 0;

}





void detach_hdlc_protocol(struct net_device *dev)

int detach_hdlc_protocol(struct net_device *dev)

{

	hdlc_device *hdlc = dev_to_hdlc(dev);

	int err;



	if (hdlc->proto) {

		err = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev);

		err = notifier_to_errno(err);

		if (err) {

			netdev_err(dev, "Refused to change device type\n");

			return err;

		}



		if (hdlc->proto->detach)

			hdlc->proto->detach(dev);

		module_put(hdlc->proto->module);
@@ -306,6 +319,8 @@ void detach_hdlc_protocol(struct net_device *dev) 
	kfree(hdlc->state);

	hdlc->state = NULL;

	hdlc_setup_dev(dev);



	return 0;

}

drivers/net/wan/hdlc_cisco.c

+1 −0
Original line number Diff line number Diff line
@@ -378,6 +378,7 @@ static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr) 
		spin_lock_init(&state(hdlc)->lock);

		dev->header_ops = &cisco_header_ops;

		dev->type = ARPHRD_CISCO;

		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);

		netif_dormant_on(dev);

		return 0;

	}

drivers/net/wan/hdlc_fr.c

+1 −0
Original line number Diff line number Diff line
@@ -1240,6 +1240,7 @@ static int fr_ioctl(struct net_device *dev, struct ifreq *ifr) 
		}

		memcpy(&state(hdlc)->settings, &new_settings, size);

		dev->type = ARPHRD_FRAD;

		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);

		return 0;



	case IF_PROTO_FR_ADD_PVC:

drivers/net/wan/hdlc_ppp.c

+1 −0
Original line number Diff line number Diff line
@@ -687,6 +687,7 @@ static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr) 
		dev->hard_header_len = sizeof(struct hdlc_header);

		dev->header_ops = &ppp_header_ops;

		dev->type = ARPHRD_PPP;

		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);

		netif_dormant_on(dev);

		return 0;

	}

drivers/net/wan/hdlc_raw.c

+1 −0
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ static int raw_ioctl(struct net_device *dev, struct ifreq *ifr) 
			return result;

		memcpy(hdlc->state, &new_settings, size);

		dev->type = ARPHRD_RAWHDLC;

		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);

		netif_dormant_off(dev);

		return 0;

	}