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

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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: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2015-12-03 21:12:31 +01:00 committed by David S. Miller
parent ff35164427
commit 2f8364a291
8 changed files with 24 additions and 3 deletions
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19
drivers/net/wan/hdlc.c
View file

@ -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;
}

1
drivers/net/wan/hdlc_cisco.c
View file

@ -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;
}

1
drivers/net/wan/hdlc_fr.c
View file

@ -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:

1
drivers/net/wan/hdlc_ppp.c
View file

@ -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;
}

1
drivers/net/wan/hdlc_raw.c
View file

@ -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;
}

1
drivers/net/wan/hdlc_raw_eth.c
View file

@ -102,6 +102,7 @@ static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
ether_setup(dev);
dev->tx_queue_len = old_qlen;
eth_hw_addr_random(dev);
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
netif_dormant_off(dev);
return 0;
}

1
drivers/net/wan/hdlc_x25.c
View file

@ -213,6 +213,7 @@ static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
if ((result = attach_hdlc_protocol(dev, &proto, 0)))
return result;
dev->type = ARPHRD_X25;
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
netif_dormant_off(dev);
return 0;
}

2
include/linux/hdlc.h
View file

@ -101,7 +101,7 @@ netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev);
int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto,
size_t size);
/* May be used by hardware driver to gain control over HDLC device */
void detach_hdlc_protocol(struct net_device *dev);
int detach_hdlc_protocol(struct net_device *dev);
static __inline__ __be16 hdlc_type_trans(struct sk_buff *skb,
struct net_device *dev)