Messages in this thread | | | Date | Wed, 5 Aug 2009 10:10:05 -0700 | From | Stephen Hemminger <> | Subject | Re: [PATCH 1/1] veth: don't free priv->status until dev->destructor (v2) |
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On Tue, 04 Aug 2009 23:40:47 -0700 ebiederm@xmission.com (Eric W. Biederman) wrote:
> Stephen Hemminger <shemminger@vyatta.com> writes: > > > On Fri, 26 Jun 2009 11:24:18 -0500 > > "Serge E. Hallyn" <serue@us.ibm.com> wrote: > > > >> Based on the commit msg on ae0e8e82205c903978a79ebf5e31c670b61fa5b4, it looks > > > >> ether_setup(dev); > >> @@ -306,7 +320,7 @@ static void veth_setup(struct net_device *dev) > >> dev->netdev_ops = &veth_netdev_ops; > >> dev->ethtool_ops = &veth_ethtool_ops; > >> dev->features |= NETIF_F_LLTX; > >> - dev->destructor = free_netdev; > >> + dev->destructor = veth_dev_free; > >> > > > > This is still going to oops if sysfs statistics referenced > > after module unload because module is unloaded (code is gone) > > and veth_dev_free no longer exists. > > Has anyone actually seen that cause an oops? > > The reason I am asking is that as I read the code we cannot have > this problem. At worst the destructor callback is delayed until: > > veth_exit > rtnl_link_unregister > rtnl_unlock > netdev_run_todo > dev->destructor > > > Similarly even if the sysfs filehandle is open we have called: > > netdev_unregister_kobject > ... > sysfs_addrm_finish > sysfs_deactivate > > Which guarantees that sysfs_get_active_two will fail and all > subsequent actions on that file will fail. > > Eric
Sysfs must be safer than it used to be.
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