Re: [PATCH 5/6] regulator: bcm590xx: Add support for BCM59054

[kernel test robot]

Hi Artur,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 05d3ef8bba77c1b5f98d941d8b2d4aeab8118ef1]

url:    https://github.com/intel-lab-lkp/linux/commits/Artur-Weber/dt-bindings-mfd-brcm-bcm59056-Convert-to-YAML/20231031-040046
base:   05d3ef8bba77c1b5f98d941d8b2d4aeab8118ef1
patch link:    https://lore.kernel.org/r/20231030-bcm59054-v1-5-3517f980c1e3%40gmail.com
patch subject: [PATCH 5/6] regulator: bcm590xx: Add support for BCM59054
config: powerpc64-allyesconfig (https://download.01.org/0day-ci/archive/20231106/202311062220.2gWiPqvR-lkp@xxxxxxxxx/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/20231106/202311062220.2gWiPqvR-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311062220.2gWiPqvR-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/regulator/bcm590xx-regulator.c:591:13: warning: variable 'n_regulators' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
     591 |         } else if (pmu->mfd->device_type == BCM59056_TYPE) {
         |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/regulator/bcm590xx-regulator.c:597:6: note: uninitialized use occurs here
     597 |                                  n_regulators,
         |                                  ^~~~~~~~~~~~
   drivers/regulator/bcm590xx-regulator.c:591:9: note: remove the 'if' if its condition is always true
     591 |         } else if (pmu->mfd->device_type == BCM59056_TYPE) {
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/regulator/bcm590xx-regulator.c:577:18: note: initialize the variable 'n_regulators' to silence this warning
     577 |         int n_regulators;
         |                         ^
         |                          = 0
   1 warning generated.


vim +591 drivers/regulator/bcm590xx-regulator.c

   569	
   570	static int bcm590xx_probe(struct platform_device *pdev)
   571	{
   572		struct bcm590xx *bcm590xx = dev_get_drvdata(pdev->dev.parent);
   573		struct bcm590xx_reg *pmu;
   574		struct regulator_config config = { };
   575		struct bcm590xx_info *info;
   576		struct regulator_dev *rdev;
   577		int n_regulators;
   578		int i;
   579	
   580		pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL);
   581		if (!pmu)
   582			return -ENOMEM;
   583	
   584		pmu->mfd = bcm590xx;
   585	
   586		platform_set_drvdata(pdev, pmu);
   587	
   588		if (pmu->mfd->device_type == BCM59054_TYPE) {
   589			info = bcm59054_regs;
   590			n_regulators = BCM59054_NUM_REGS;
 > 591		} else if (pmu->mfd->device_type == BCM59056_TYPE) {
   592			info = bcm59056_regs;
   593			n_regulators = BCM59056_NUM_REGS;
   594		}
   595	
   596		pmu->desc = devm_kcalloc(&pdev->dev,
   597					 n_regulators,
   598					 sizeof(struct regulator_desc),
   599					 GFP_KERNEL);
   600		if (!pmu->desc)
   601			return -ENOMEM;
   602	
   603		/* Register the regulators */
   604		for (i = 0; i < n_regulators; i++, info++) {
   605			pmu->desc[i].name = info->name;
   606			pmu->desc[i].of_match = of_match_ptr(info->name);
   607			pmu->desc[i].regulators_node = of_match_ptr("regulators");
   608			pmu->desc[i].supply_name = info->vin_name;
   609			pmu->desc[i].id = i;
   610			pmu->desc[i].volt_table = info->volt_table;
   611			pmu->desc[i].n_voltages = info->n_voltages;
   612			pmu->desc[i].linear_ranges = info->linear_ranges;
   613			pmu->desc[i].n_linear_ranges = info->n_linear_ranges;
   614	
   615			if (bcm590xx_reg_is_ldo(pmu, i) || \
   616					bcm590xx_reg_is_gpldo(pmu, i)) {
   617				pmu->desc[i].ops = &bcm590xx_ops_ldo;
   618				pmu->desc[i].vsel_mask = BCM590XX_LDO_VSEL_MASK;
   619			} else if (bcm590xx_reg_is_static(pmu, i)) {
   620				pmu->desc[i].ops = &bcm590xx_ops_static;
   621			} else {
   622				pmu->desc[i].ops = &bcm590xx_ops_dcdc;
   623				pmu->desc[i].vsel_mask = BCM590XX_SR_VSEL_MASK;
   624			}
   625	
   626			if (bcm590xx_reg_is_vbus(pmu, i)) {
   627				pmu->desc[i].enable_mask = BCM590XX_VBUS_ENABLE;
   628			} else {
   629				pmu->desc[i].vsel_reg = \
   630					bcm590xx_get_vsel_register(pmu, i);
   631				pmu->desc[i].enable_mask = \
   632					bcm590xx_get_enable_mask(pmu, i);
   633				pmu->desc[i].enable_is_inverted = true;
   634			}
   635			pmu->desc[i].enable_reg = \
   636				bcm590xx_get_enable_register(pmu, i);
   637			pmu->desc[i].type = REGULATOR_VOLTAGE;
   638			pmu->desc[i].owner = THIS_MODULE;
   639	
   640			config.dev = pmu->mfd->dev;
   641			config.driver_data = pmu;
   642			if (bcm590xx_reg_is_secondary(pmu, i))
   643				config.regmap = pmu->mfd->regmap_sec;
   644			else
   645				config.regmap = pmu->mfd->regmap_pri;
   646	
   647			rdev = devm_regulator_register(&pdev->dev, &pmu->desc[i],
   648						       &config);
   649			if (IS_ERR(rdev)) {
   650				dev_err(bcm590xx->dev,
   651					"failed to register %s regulator\n",
   652					pdev->name);
   653				return PTR_ERR(rdev);
   654			}
   655		}
   656	
   657		return 0;
   658	}
   659	

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