Re: [PATCH] hwmon: Add driver for Gigabyte AORUS Waterforce AIO coolers

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

Hi Aleksa,

kernel test robot noticed the following build warnings:

[auto build test WARNING on groeck-staging/hwmon-next]
[also build test WARNING on linus/master v6.6-rc7 next-20231027]
[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/Aleksa-Savic/hwmon-Add-driver-for-Gigabyte-AORUS-Waterforce-AIO-coolers/20231020-210452
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
patch link:    https://lore.kernel.org/r/20231020130212.8919-1-savicaleksa83%40gmail.com
patch subject: [PATCH] hwmon: Add driver for Gigabyte AORUS Waterforce AIO coolers
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20231030/202310300959.8NLKyQDJ-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/20231030/202310300959.8NLKyQDJ-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/202310300959.8NLKyQDJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/hwmon/gigabyte_waterforce.c:130:7: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
     130 |                 if (!time_after(jiffies, priv->updated + msecs_to_jiffies(STATUS_VALIDITY))) {
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/hwmon/gigabyte_waterforce.c:155:7: note: uninitialized use occurs here
     155 |                 if (ret < 0)
         |                     ^~~
   drivers/hwmon/gigabyte_waterforce.c:130:3: note: remove the 'if' if its condition is always false
     130 |                 if (!time_after(jiffies, priv->updated + msecs_to_jiffies(STATUS_VALIDITY))) {
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     131 |                         /* Data is up to date */
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     132 |                         goto unlock_and_return;
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     133 |                 }
         | ~~~~~~~~~~~~~~~~~
   drivers/hwmon/gigabyte_waterforce.c:127:9: note: initialize the variable 'ret' to silence this warning
     127 |         int ret;
         |                ^
         |                 = 0
   1 warning generated.


vim +130 drivers/hwmon/gigabyte_waterforce.c

   124	
   125	static int waterforce_get_status(struct waterforce_data *priv)
   126	{
   127		int ret;
   128	
   129		if (!mutex_lock_interruptible(&priv->status_report_request_mutex)) {
 > 130			if (!time_after(jiffies, priv->updated + msecs_to_jiffies(STATUS_VALIDITY))) {
   131				/* Data is up to date */
   132				goto unlock_and_return;
   133			}
   134	
   135			/*
   136			 * Disable raw event parsing for a moment to safely reinitialize the
   137			 * completion. Reinit is done because hidraw could have triggered
   138			 * the raw event parsing and marked the priv->status_report_received
   139			 * completion as done.
   140			 */
   141			spin_lock_bh(&priv->status_report_request_lock);
   142			reinit_completion(&priv->status_report_received);
   143			spin_unlock_bh(&priv->status_report_request_lock);
   144	
   145			/* Send command for getting status */
   146			ret = waterforce_write_expanded(priv, get_status_cmd, GET_STATUS_CMD_LENGTH);
   147			if (ret < 0)
   148				return ret;
   149	
   150			if (wait_for_completion_interruptible_timeout
   151			    (&priv->status_report_received, msecs_to_jiffies(STATUS_VALIDITY)) <= 0)
   152				ret = -ENODATA;
   153	unlock_and_return:
   154			mutex_unlock(&priv->status_report_request_mutex);
   155			if (ret < 0)
   156				return ret;
   157		} else {
   158			return -ENODATA;
   159		}
   160	
   161		return 0;
   162	}
   163	

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