On Sat, Feb 2, 2019 at 10:38 PM kbuild test robot <l...@intel.com> wrote:
>
> 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;
> ^~~
the 'ret' is initialized actually before returning
> 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 <niko...@redhat.com>
> :::::: CC: David S. Miller <da...@davemloft.net>
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
