Re: [PATCH v1 2/2] scsi: ufs: core: Add sysfs node for UFS RTC update

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

Hi Bean,

kernel test robot noticed the following build warnings:

[auto build test WARNING on mkp-scsi/for-next]
[also build test WARNING on jejb-scsi/for-next linus/master v6.6 next-20231110]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Bean-Huo/scsi-ufs-core-Add-UFS-RTC-support/20231110-051048
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next
patch link:    https://lore.kernel.org/r/20231109125217.185462-3-beanhuo%40iokpp.de
patch subject: [PATCH v1 2/2] scsi: ufs: core: Add sysfs node for UFS RTC update
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20231112/202311120923.S1Zbpb0s-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231112/202311120923.S1Zbpb0s-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311120923.S1Zbpb0s-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/ufs/core/ufs-sysfs.c:276:6: warning: variable 'resume_period_update' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
     276 |         if (!hba->dev_info.rtc_update_period && ms > 0)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/ufs/core/ufs-sysfs.c:281:6: note: uninitialized use occurs here
     281 |         if (resume_period_update)
         |             ^~~~~~~~~~~~~~~~~~~~
   drivers/ufs/core/ufs-sysfs.c:276:2: note: remove the 'if' if its condition is always true
     276 |         if (!hba->dev_info.rtc_update_period && ms > 0)
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     277 |                 resume_period_update =  true;
         | ~~~~~~~~~~~~~~~~
>> drivers/ufs/core/ufs-sysfs.c:276:6: warning: variable 'resume_period_update' is used uninitialized whenever '&&' condition is false [-Wsometimes-uninitialized]
     276 |         if (!hba->dev_info.rtc_update_period && ms > 0)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/ufs/core/ufs-sysfs.c:281:6: note: uninitialized use occurs here
     281 |         if (resume_period_update)
         |             ^~~~~~~~~~~~~~~~~~~~
   drivers/ufs/core/ufs-sysfs.c:276:6: note: remove the '&&' if its condition is always true
     276 |         if (!hba->dev_info.rtc_update_period && ms > 0)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/ufs/core/ufs-sysfs.c:271:27: note: initialize the variable 'resume_period_update' to silence this warning
     271 |         bool resume_period_update;
         |                                  ^
         |                                   = 0
   2 warnings generated.


vim +276 drivers/ufs/core/ufs-sysfs.c

   265	
   266	static ssize_t rtc_update_ms_store(struct device *dev, struct device_attribute *attr,
   267				   const char *buf, size_t count)
   268	{
   269		struct ufs_hba *hba = dev_get_drvdata(dev);
   270		unsigned int ms;
   271		bool resume_period_update;
   272	
   273		if (kstrtouint(buf, 0, &ms))
   274			return -EINVAL;
   275	
 > 276		if (!hba->dev_info.rtc_update_period && ms > 0)
   277			resume_period_update =  true;
   278		/* Minimum and maximum update frequency should be synchronized with all UFS vendors */
   279		hba->dev_info.rtc_update_period = ms;
   280	
   281		if (resume_period_update)
   282			schedule_delayed_work(&hba->ufs_rtc_delayed_work,
   283							msecs_to_jiffies(hba->dev_info.rtc_update_period));
   284		return count;
   285	}
   286	

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