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Date:   Sat, 2 Feb 2019 22:38:34 +0800
From:   kbuild test robot <lkp@...el.com>
To:     xiangxia.m.yue@...il.com
Cc:     kbuild-all@...org, davem@...emloft.net, netdev@...r.kernel.org,
        Tonghao Zhang <xiangxia.m.yue@...il.com>
Subject: Re: [PATCH net-next] bonding: check slave set command firstly

Hi Tonghao,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/xiangxia-m-yue-gmail-com/bonding-check-slave-set-command-firstly/20190202-215305
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 8.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=8.2.0 make.cross ARCH=xtensa 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/net/bonding/bond_options.c: In function 'bond_option_slaves_set':
>> drivers/net/bonding/bond_options.c:1403:9: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return ret;
            ^~~

vim +/ret +1403 drivers/net/bonding/bond_options.c

0e2e5b66 Nikolay Aleksandrov 2014-01-22  1366  
f3253339 stephen hemminger   2014-03-04  1367  static int bond_option_slaves_set(struct bonding *bond,
28f084cc stephen hemminger   2014-03-06  1368  				  const struct bond_opt_value *newval)
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1369  {
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1370  	char command[IFNAMSIZ + 1] = { 0, };
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1371  	struct net_device *dev;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1372  	char *ifname;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1373  	int ret;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1374  
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1375  	sscanf(newval->string, "%16s", command); /* IFNAMSIZ*/
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1376  	ifname = command + 1;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1377  	if ((strlen(command) <= 1) ||
c9914772 Tonghao Zhang       2019-02-01  1378  	    (command[0] != '+' && command[0] != '-') ||
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1379  	    !dev_valid_name(ifname))
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1380  		goto err_no_cmd;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1381  
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1382  	dev = __dev_get_by_name(dev_net(bond->dev), ifname);
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1383  	if (!dev) {
eac306b4 Michael Dilmore     2017-06-26  1384  		netdev_dbg(bond->dev, "interface %s does not exist!\n",
2de390ba Veaceslav Falico    2014-07-15  1385  			   ifname);
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1386  		ret = -ENODEV;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1387  		goto out;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1388  	}
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1389  
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1390  	switch (command[0]) {
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1391  	case '+':
eac306b4 Michael Dilmore     2017-06-26  1392  		netdev_dbg(bond->dev, "Adding slave %s\n", dev->name);
33eaf2a6 David Ahern         2017-10-04  1393  		ret = bond_enslave(bond->dev, dev, NULL);
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1394  		break;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1395  
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1396  	case '-':
eac306b4 Michael Dilmore     2017-06-26  1397  		netdev_dbg(bond->dev, "Removing slave %s\n", dev->name);
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1398  		ret = bond_release(bond->dev, dev);
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1399  		break;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1400  	}
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1401  
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1402  out:
0e2e5b66 Nikolay Aleksandrov 2014-01-22 @1403  	return ret;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1404  
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1405  err_no_cmd:
2de390ba Veaceslav Falico    2014-07-15  1406  	netdev_err(bond->dev, "no command found in slaves file - use +ifname or -ifname\n");
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1407  	ret = -EPERM;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1408  	goto out;
0e2e5b66 Nikolay Aleksandrov 2014-01-22  1409  }
e9f0fb88 Mahesh Bandewar     2014-04-22  1410  

:::::: The code at line 1403 was first introduced by commit
:::::: 0e2e5b66e9de377d69f50a456fdd60462889c64f bonding: convert slaves to use the new option API

:::::: TO: Nikolay Aleksandrov <nikolay@...hat.com>
:::::: CC: David S. Miller <davem@...emloft.net>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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