linux-kernel - [mcgrof-next:20210708-block-fixes-v2 41/89] drivers/block/rsxx/dev.c:200:6: warning: variable 'err' is used uninitialized whenever 'if' condition is false

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Message-ID: <202107152257.je1CyWOZ-lkp@intel.com>
Date:   Thu, 15 Jul 2021 22:59:08 +0800
From:   kernel test robot <lkp@...el.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [mcgrof-next:20210708-block-fixes-v2 41/89]
 drivers/block/rsxx/dev.c:200:6: warning: variable 'err' is used
 uninitialized whenever 'if' condition is false

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20210708-block-fixes-v2
head:   db0174e39de7dc941f158ce53ee3af95b1635b62
commit: 2903597b8e65371aac6825294c9d99c2c36c94fd [41/89] block/rsxx: add error handling support for add_disk()
config: x86_64-randconfig-a001-20210715 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 0e49c54a8cbd3e779e5526a5888c683c01cc3c50)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/commit/?id=2903597b8e65371aac6825294c9d99c2c36c94fd
        git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git
        git fetch --no-tags mcgrof-next 20210708-block-fixes-v2
        git checkout 2903597b8e65371aac6825294c9d99c2c36c94fd
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> drivers/block/rsxx/dev.c:200:6: warning: variable 'err' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (enable_blkdev) {
               ^~~~~~~~~~~~~
   drivers/block/rsxx/dev.c:212:6: note: uninitialized use occurs here
           if (err)
               ^~~
   drivers/block/rsxx/dev.c:200:2: note: remove the 'if' if its condition is always true
           if (enable_blkdev) {
           ^~~~~~~~~~~~~~~~~~~
   drivers/block/rsxx/dev.c:195:9: note: initialize the variable 'err' to silence this warning
           int err;
                  ^
                   = 0
   1 warning generated.


vim +200 drivers/block/rsxx/dev.c

8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  192  
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  193  int rsxx_attach_dev(struct rsxx_cardinfo *card)
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  194  {
2903597b8e6537 Luis Chamberlain         2021-07-13  195  	int err;
2903597b8e6537 Luis Chamberlain         2021-07-13  196  
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  197  	mutex_lock(&card->dev_lock);
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  198  
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  199  	/* The block device requires the stripe size from the config. */
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05 @200  	if (enable_blkdev) {
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  201  		if (card->config_valid)
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  202  			set_capacity(card->gendisk, card->size8 >> 9);
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  203  		else
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  204  			set_capacity(card->gendisk, 0);
2903597b8e6537 Luis Chamberlain         2021-07-13  205  		err = device_add_disk(CARD_TO_DEV(card), card->gendisk, NULL);
2903597b8e6537 Luis Chamberlain         2021-07-13  206  		if (err == 0)
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  207  			card->bdev_attached = 1;
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  208  	}
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  209  
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  210  	mutex_unlock(&card->dev_lock);
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  211  
2903597b8e6537 Luis Chamberlain         2021-07-13  212  	if (err)
2903597b8e6537 Luis Chamberlain         2021-07-13  213  		blk_cleanup_disk(card->gendisk);
2903597b8e6537 Luis Chamberlain         2021-07-13  214  
2903597b8e6537 Luis Chamberlain         2021-07-13  215  	return err;
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  216  }
8722ff8cdbfac9 josh.h.morris@...ibm.com 2013-02-05  217  

:::::: The code at line 200 was first introduced by commit
:::::: 8722ff8cdbfac9c1b20e67bb067b455c48cb8e93 block: IBM RamSan 70/80 device driver

:::::: TO: josh.h.morris@...ibm.com <josh.h.morris@...ibm.com>
:::::: CC: Jens Axboe <axboe@...nel.dk>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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