linux-kernel - Re: [PATCH V3 net-next 3/4] net: dsa: mv88e6xxx: mac-auth/MAB implementation

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Date:   Wed, 25 May 2022 05:36:08 +0800
From:   kernel test robot <lkp@...el.com>
To:     Hans Schultz <schultz.hans@...il.com>, davem@...emloft.net,
        kuba@...nel.org
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        netdev@...r.kernel.org,
        Hans Schultz <schultz.hans+netdev@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Ido Schimmel <idosch@...dia.com>, linux-kernel@...r.kernel.org,
        bridge@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH V3 net-next 3/4] net: dsa: mv88e6xxx: mac-auth/MAB
 implementation

Hi Hans,

Thank you for the patch! Perhaps something to improve:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Hans-Schultz/Extend-locked-port-feature-with-FDB-locked-flag-MAC-Auth-MAB/20220524-232455
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 677fb7525331375ba2f90f4bc94a80b9b6e697a3
config: x86_64-randconfig-a005 (https://download.01.org/0day-ci/archive/20220525/202205250511.beuDDi9L-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 10c9ecce9f6096e18222a331c5e7d085bd813f75)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/5c2d731ec7670b3eb06906c64d66c6098c588a6a
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Hans-Schultz/Extend-locked-port-feature-with-FDB-locked-flag-MAC-Auth-MAB/20220524-232455
        git checkout 5c2d731ec7670b3eb06906c64d66c6098c588a6a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/dsa/mv88e6xxx/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/net/dsa/mv88e6xxx/chip.c:2754:6: warning: variable 'err' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (!locked_found) {
               ^~~~~~~~~~~~~
   drivers/net/dsa/mv88e6xxx/chip.c:2759:9: note: uninitialized use occurs here
           return err;
                  ^~~
   drivers/net/dsa/mv88e6xxx/chip.c:2754:2: note: remove the 'if' if its condition is always true
           if (!locked_found) {
           ^~~~~~~~~~~~~~~~~~~
   drivers/net/dsa/mv88e6xxx/chip.c:2749:9: note: initialize the variable 'err' to silence this warning
           int err;
                  ^
                   = 0
   1 warning generated.


vim +2754 drivers/net/dsa/mv88e6xxx/chip.c

  2742	
  2743	static int mv88e6xxx_port_fdb_del(struct dsa_switch *ds, int port,
  2744					  const unsigned char *addr, u16 vid,
  2745					  struct dsa_db db)
  2746	{
  2747		struct mv88e6xxx_chip *chip = ds->priv;
  2748		bool locked_found = false;
  2749		int err;
  2750	
  2751		if (mv88e6xxx_port_is_locked(chip, port, true))
  2752			locked_found = mv88e6xxx_atu_locked_entry_find_purge(ds, port, addr, vid);
  2753	
> 2754		if (!locked_found) {
  2755			mv88e6xxx_reg_lock(chip);
  2756			err = mv88e6xxx_port_db_load_purge(chip, port, addr, vid, 0);
  2757			mv88e6xxx_reg_unlock(chip);
  2758		}
  2759		return err;
  2760	}
  2761	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp