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https://github.com/openvswitch/ovs
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63db6ec35d
'struct net_device' is refcounted and can stick around for quite a while if someone is still holding a reference to it. However, we free the vport that it is attached to in the next RCU grace period after detach. This assigns the vport to NULL on detach and adds appropriate checks.
66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/*
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* Distributed under the terms of the GNU GPL version 2.
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* Copyright (c) 2007, 2008, 2009, 2010 Nicira Networks.
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*
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* Significant portions of this file may be copied from parts of the Linux
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* kernel, by Linus Torvalds and others.
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*/
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/* Handle changes to managed devices */
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#include <linux/netdevice.h>
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#include "datapath.h"
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#include "vport-internal_dev.h"
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#include "vport-netdev.h"
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static int dp_device_event(struct notifier_block *unused, unsigned long event,
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void *ptr)
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{
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struct net_device *dev = ptr;
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struct vport *vport;
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struct dp_port *p;
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struct datapath *dp;
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if (is_internal_dev(dev))
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vport = internal_dev_get_vport(dev);
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else
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vport = netdev_get_vport(dev);
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if (!vport)
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return NOTIFY_DONE;
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p = vport_get_dp_port(vport);
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if (!p)
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return NOTIFY_DONE;
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dp = p->dp;
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switch (event) {
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case NETDEV_UNREGISTER:
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mutex_lock(&dp->mutex);
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dp_detach_port(p, 1);
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mutex_unlock(&dp->mutex);
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break;
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case NETDEV_CHANGENAME:
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if (p->port_no != ODPP_LOCAL) {
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mutex_lock(&dp->mutex);
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dp_sysfs_del_if(p);
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dp_sysfs_add_if(p);
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mutex_unlock(&dp->mutex);
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}
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break;
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case NETDEV_CHANGEMTU:
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if (!is_internal_dev(dev))
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set_internal_devs_mtu(dp);
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break;
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}
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return NOTIFY_DONE;
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}
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struct notifier_block dp_device_notifier = {
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.notifier_call = dp_device_event
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};
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