[v2,01/21] exit_net cleanup: geneve sock_list check

Be sure that sock_list initialized in net_init hook was return
to initial state.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
 drivers/net/geneve.c | 2 ++
 1 file changed, 2 insertions(+)

Hi Vasily,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net/master]
[also build test WARNING on v4.14-rc8 next-20171106]
[cannot apply to net-next/master]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Vasily-Averin/exit_net-checks-for-objects-initialized-in-net_init-hook/20171107-094512
config: i386-randconfig-x001-201745 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/bug.h:82:0,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:12,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:81,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/module.h:10,
                    from drivers/net/geneve.c:14:
   drivers/net/geneve.c: In function 'geneve_exit_net':
>> drivers/net/geneve.c:1671:7: warning: too many arguments for format [-Wformat-extra-args]
          "&s: sock_list is not empty\n", __func__);
          ^
   include/asm-generic/bug.h:94:43: note: in definition of macro '__WARN_printf'
    #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
                                              ^~~
>> drivers/net/geneve.c:1670:2: note: in expansion of macro 'WARN'
     WARN(!list_empty(&gn->sock_list),
     ^~~~

vim +1671 drivers/net/geneve.c

  1643	
  1644	static void __net_exit geneve_exit_net(struct net *net)
  1645	{
  1646		struct geneve_net *gn = net_generic(net, geneve_net_id);
  1647		struct geneve_dev *geneve, *next;
  1648		struct net_device *dev, *aux;
  1649		LIST_HEAD(list);
  1650	
  1651		rtnl_lock();
  1652	
  1653		/* gather any geneve devices that were moved into this ns */
  1654		for_each_netdev_safe(net, dev, aux)
  1655			if (dev->rtnl_link_ops == &geneve_link_ops)
  1656				unregister_netdevice_queue(dev, &list);
  1657	
  1658		/* now gather any other geneve devices that were created in this ns */
  1659		list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
  1660			/* If geneve->dev is in the same netns, it was already added
  1661			 * to the list by the previous loop.
  1662			 */
  1663			if (!net_eq(dev_net(geneve->dev), net))
  1664				unregister_netdevice_queue(geneve->dev, &list);
  1665		}
  1666	
  1667		/* unregister the devices gathered above */
  1668		unregister_netdevice_many(&list);
  1669		rtnl_unlock();
> 1670		WARN(!list_empty(&gn->sock_list),
> 1671		     "&s: sock_list is not empty\n", __func__);
  1672	}
  1673	

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