Re: [PATCH v3] net: net_failover: Fix the deadlock in slave register

[kernel test robot <lkp@intel.com>]

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on net-next/main]
[also build test ERROR on net/main linus/master v7.1-rc3 next-20260508]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/faicker-mo-gmail-com/net-net_failover-Fix-the-deadlock-in-slave-register/20260513-045805
base:   net-next/main
patch link:    https://lore.kernel.org/r/20260507074332.2543229-1-faicker.mo%40gmail.com
patch subject: [PATCH v3] net: net_failover: Fix the deadlock in slave register
config: i386-randconfig-141-20260513 (https://download.01.org/0day-ci/archive/20260513/202605131216.7sSRq0Gy-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
smatch: v0.5.0-9185-gbcc58b9c
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260513/202605131216.7sSRq0Gy-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605131216.7sSRq0Gy-lkp@intel.com/

All errors (new ones prefixed by >>):

   net/core/failover.c: In function 'failover_existing_slave_register':
>> net/core/failover.c:225:25: error: implicit declaration of function 'netdev_lock_ops'; did you mean 'netdev_lock'? [-Wimplicit-function-declaration]
     225 |                         netdev_lock_ops(dev);
         |                         ^~~~~~~~~~~~~~~
         |                         netdev_lock
>> net/core/failover.c:227:25: error: implicit declaration of function 'netdev_unlock_ops'; did you mean 'netdev_unlock'? [-Wimplicit-function-declaration]
     227 |                         netdev_unlock_ops(dev);
         |                         ^~~~~~~~~~~~~~~~~
         |                         netdev_unlock


vim +225 net/core/failover.c

   213	
   214	static void
   215	failover_existing_slave_register(struct net_device *failover_dev)
   216	{
   217		struct net *net = dev_net(failover_dev);
   218		struct net_device *dev;
   219	
   220		rtnl_lock();
   221		for_each_netdev(net, dev) {
   222			if (netif_is_failover(dev))
   223				continue;
   224			if (ether_addr_equal(failover_dev->perm_addr, dev->perm_addr)) {
 > 225				netdev_lock_ops(dev);
   226				failover_slave_register(dev);
 > 227				netdev_unlock_ops(dev);
   228			}
   229		}
   230		rtnl_unlock();
   231	}
   232	

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