Re: [PATCH] media: Add t4ka3 camera sensor driver

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

Hi Kate,

kernel test robot noticed the following build warnings:

[auto build test WARNING on media-tree/master]
[also build test WARNING on linuxtv-media-stage/master sailus-media-tree/master linus/master v6.12-rc1 next-20241003]
[cannot apply to sailus-media-tree/streams]
[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/Kate-Hsuan/media-Add-t4ka3-camera-sensor-driver/20241002-173303
base:   git://linuxtv.org/media_tree.git master
patch link:    https://lore.kernel.org/r/20241002093037.50875-1-hpa%40redhat.com
patch subject: [PATCH] media: Add t4ka3 camera sensor driver
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241003/202410031909.fcXYISbG-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241003/202410031909.fcXYISbG-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/202410031909.fcXYISbG-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/media/i2c/t4ka3.c:628:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
     628 |         if (sensor->streaming == enable) {
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/media/i2c/t4ka3.c:689:9: note: uninitialized use occurs here
     689 |         return ret;
         |                ^~~
   drivers/media/i2c/t4ka3.c:628:2: note: remove the 'if' if its condition is always false
     628 |         if (sensor->streaming == enable) {
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     629 |                 dev_warn(sensor->dev, "Stream already %s\n", enable ? "started" : "stopped");
         |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     630 |                 goto error_unlock;
         |                 ~~~~~~~~~~~~~~~~~~
     631 |         }
         |         ~
   drivers/media/i2c/t4ka3.c:624:9: note: initialize the variable 'ret' to silence this warning
     624 |         int ret;
         |                ^
         |                 = 0
   1 warning generated.


vim +628 drivers/media/i2c/t4ka3.c

   620	
   621	static int t4ka3_s_stream(struct v4l2_subdev *sd, int enable)
   622	{
   623		struct t4ka3_data *sensor = to_t4ka3_sensor(sd);
   624		int ret;
   625	
   626		mutex_lock(&sensor->lock);
   627	
 > 628		if (sensor->streaming == enable) {
   629			dev_warn(sensor->dev, "Stream already %s\n", enable ? "started" : "stopped");
   630			goto error_unlock;
   631		}
   632	
   633		if (enable) {
   634			ret = pm_runtime_get_sync(sensor->sd.dev);
   635			if (ret) {
   636				dev_err(sensor->dev, "power-up err.\n");
   637				goto error_unlock;
   638			}
   639	
   640			cci_multi_reg_write(sensor->regmap, t4ka3_init_config,
   641					    ARRAY_SIZE(t4ka3_init_config), &ret);
   642			/* enable group hold */
   643			cci_write(sensor->regmap, T4KA3_REG_PARAM_HOLD, 1, &ret);
   644			cci_multi_reg_write(sensor->regmap, t4ka3_pre_mode_set_regs,
   645					    ARRAY_SIZE(t4ka3_pre_mode_set_regs), &ret);
   646			if (ret)
   647				goto error_powerdown;
   648	
   649			ret = t4ka3_set_mode(sensor);
   650			if (ret)
   651				goto error_powerdown;
   652	
   653			ret = cci_multi_reg_write(sensor->regmap, t4ka3_post_mode_set_regs,
   654						  ARRAY_SIZE(t4ka3_post_mode_set_regs), NULL);
   655			if (ret)
   656				goto error_powerdown;
   657	
   658			/* Restore value of all ctrls */
   659			ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
   660			if (ret)
   661				goto error_powerdown;
   662	
   663			/* disable group hold */
   664			cci_write(sensor->regmap, T4KA3_REG_PARAM_HOLD, 0, &ret);
   665			cci_write(sensor->regmap, T4KA3_REG_STREAM, 1, &ret);
   666			if (ret)
   667				goto error_powerdown;
   668	
   669			sensor->streaming = 1;
   670		} else {
   671			ret = cci_write(sensor->regmap, T4KA3_REG_STREAM, 0, NULL);
   672			if (ret)
   673				goto error_powerdown;
   674	
   675			ret = pm_runtime_put(sensor->sd.dev);
   676			if (ret)
   677				goto error_unlock;
   678	
   679			sensor->streaming = 0;
   680		}
   681	
   682		mutex_unlock(&sensor->lock);
   683		return ret;
   684	
   685	error_powerdown:
   686		ret = pm_runtime_put(sensor->sd.dev);
   687	error_unlock:
   688		mutex_unlock(&sensor->lock);
   689		return ret;
   690	}
   691	

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