Re: [PATCH] lightnvm: missing nvm_lock acquire

[kbuild test robot <lkp@intel.com>]

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Hi Wenwei,

[auto build test WARNING on v4.4-rc2]
[also build test WARNING on next-20151124]

url:    https://github.com/0day-ci/linux/commits/Wenwei-Tao/lightnvm-missing-nvm_lock-acquire/20151124-232858
config: x86_64-randconfig-x016-11241713 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   drivers/lightnvm/core.c: In function 'nvm_unregister':
>> drivers/lightnvm/core.c:337:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     struct nvm_dev *dev = nvm_find_nvm_dev(disk_name);
     ^

vim +337 drivers/lightnvm/core.c

cd9e9808 Matias Bjørling 2015-10-28  321  		}
cd9e9808 Matias Bjørling 2015-10-28  322  	} else if (dev->ops->max_phys_sect > 256) {
cd9e9808 Matias Bjørling 2015-10-28  323  		pr_info("nvm: max sectors supported is 256.\n");
cd9e9808 Matias Bjørling 2015-10-28  324  		return -EINVAL;
cd9e9808 Matias Bjørling 2015-10-28  325  	}
cd9e9808 Matias Bjørling 2015-10-28  326  
cd9e9808 Matias Bjørling 2015-10-28  327  	return 0;
cd9e9808 Matias Bjørling 2015-10-28  328  err_init:
cd9e9808 Matias Bjørling 2015-10-28  329  	kfree(dev);
cd9e9808 Matias Bjørling 2015-10-28  330  	return ret;
cd9e9808 Matias Bjørling 2015-10-28  331  }
cd9e9808 Matias Bjørling 2015-10-28  332  EXPORT_SYMBOL(nvm_register);
cd9e9808 Matias Bjørling 2015-10-28  333  
cd9e9808 Matias Bjørling 2015-10-28  334  void nvm_unregister(char *disk_name)
cd9e9808 Matias Bjørling 2015-10-28  335  {
0d5267d8 Wenwei Tao      2015-11-24  336  	down_write(&nvm_lock);
cd9e9808 Matias Bjørling 2015-10-28 @337  	struct nvm_dev *dev = nvm_find_nvm_dev(disk_name);
cd9e9808 Matias Bjørling 2015-10-28  338  
cd9e9808 Matias Bjørling 2015-10-28  339  	if (!dev) {
cd9e9808 Matias Bjørling 2015-10-28  340  		pr_err("nvm: could not find device %s to unregister\n",
cd9e9808 Matias Bjørling 2015-10-28  341  								disk_name);
0d5267d8 Wenwei Tao      2015-11-24  342  		up_write(&nvm_lock);
cd9e9808 Matias Bjørling 2015-10-28  343  		return;
cd9e9808 Matias Bjørling 2015-10-28  344  	}
cd9e9808 Matias Bjørling 2015-10-28  345  

:::::: The code at line 337 was first introduced by commit
:::::: cd9e9808d18fe7107c306f6e71c8be7230ee42b4 lightnvm: Support for Open-Channel SSDs

:::::: TO: Matias Bjørling <m@bjorling.me>
:::::: CC: Jens Axboe <axboe@fb.com>

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