Message ID | 1549030035-22082-1-git-send-email-xiangxia.m.yue@gmail.com |
---|---|
State | Changes Requested |
Delegated to: | David Miller |
Headers | show |
Series | [net-next] bonding: check slave set command firstly | expand |
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@redhat.com>
:::::: CC: David S. Miller <davem@davemloft.net>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
On Sat, Feb 2, 2019 at 10:38 PM kbuild test robot <lkp@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 <nikolay@redhat.com> > :::::: CC: David S. Miller <davem@davemloft.net> > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation
From: xiangxia.m.yue@gmail.com Date: Fri, 1 Feb 2019 06:07:15 -0800 > From: Tonghao Zhang <xiangxia.m.yue@gmail.com> > > This patch is a little improvement. If user use the > command shown as below, we should print the info [1] > instead of [2]. The eth0 exists actually, and it may > confuse user. > > $ echo "eth0" > /sys/class/net/bond4/bonding/slaves > > [1] "bond4: no command found in slaves file - use +ifname or -ifname" > [2] "write error: No such device" > > Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com> Please fix the compiler warning reported to you.
diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c index 4d5d01c..5526229 100644 --- a/drivers/net/bonding/bond_options.c +++ b/drivers/net/bonding/bond_options.c @@ -1375,6 +1375,7 @@ static int bond_option_slaves_set(struct bonding *bond, sscanf(newval->string, "%16s", command); /* IFNAMSIZ*/ ifname = command + 1; if ((strlen(command) <= 1) || + (command[0] != '+' && command[0] != '-') || !dev_valid_name(ifname)) goto err_no_cmd; @@ -1396,9 +1397,6 @@ static int bond_option_slaves_set(struct bonding *bond, netdev_dbg(bond->dev, "Removing slave %s\n", dev->name); ret = bond_release(bond->dev, dev); break; - - default: - goto err_no_cmd; } out: