linux-kernel - drivers/nvme/target/fcloop.c:1080:9: warning: 'tport' may be used uninitialized in this function

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Date:   Wed, 6 Dec 2017 13:12:11 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     James Smart <jsmart2021@...il.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>
Subject: drivers/nvme/target/fcloop.c:1080:9: warning: 'tport' may be used
 uninitialized in this function

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   328b4ed93b69a6f2083d52f31a240a09e5de386a
commit: fddc9923c6d41de9fe7b1f323a3cece53e046c88 nvme-fcloop: fix port deletes and callbacks
date:   2 months ago
config: i386-randconfig-h1-12061225 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout fddc9923c6d41de9fe7b1f323a3cece53e046c88
        # save the attached .config to linux build tree
        make ARCH=i386 

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/nvme/target/fcloop.c: In function 'fcloop_delete_target_port':
>> drivers/nvme/target/fcloop.c:1080:9: warning: 'tport' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return nvmet_fc_unregister_targetport(tport->targetport);
            ^
   drivers/nvme/target/fcloop.c:1088:23: note: 'tport' was declared here
     struct fcloop_tport *tport;
                          ^

vim +/tport +1080 drivers/nvme/target/fcloop.c

  1073	
  1074	static int
  1075	__targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport)
  1076	{
  1077		if (!tport)
  1078			return -EALREADY;
  1079	
> 1080		return nvmet_fc_unregister_targetport(tport->targetport);
  1081	}
  1082	

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