[asahilinux:bits/120-spmi 3/4] drivers/nvmem/spmi-mfd-nvmem.c:40:13: warning: use of uninitialized value '<unknown>' [CWE-457]

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

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:::::: 
:::::: Manual check reason: "low confidence bisect report"
:::::: Manual check reason: "low confidence static check warning: drivers/nvmem/spmi-mfd-nvmem.c:40:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]"
:::::: 

BCC: lkp(a)intel.com
CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Hector Martin <marcan@marcan.st>

tree:   https://github.com/AsahiLinux/linux bits/120-spmi
head:   0324791a3cdc3e93df57f6293e2cfaaadc264aeb
commit: 7d8a1a4c3dddcdaa51aa354bf82074a86640794c [3/4] nvmem: Add spmi-mfd-nvmem driver
:::::: branch date: 12 days ago
:::::: commit date: 12 days ago
config: arm-randconfig-c002-20220804 (https://download.01.org/0day-ci/archive/20220814/202208142340.YtHpyTAP-lkp(a)intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/AsahiLinux/linux/commit/7d8a1a4c3dddcdaa51aa354bf82074a86640794c
        git remote add asahilinux https://github.com/AsahiLinux/linux
        git fetch --no-tags asahilinux bits/120-spmi
        git checkout 7d8a1a4c3dddcdaa51aa354bf82074a86640794c
        # save the config file
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error' 

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

gcc-analyzer warnings: (new ones prefixed by >>)
   drivers/nvmem/spmi-mfd-nvmem.c: In function 'spmi_mfd_nvmem_probe':
>> drivers/nvmem/spmi-mfd-nvmem.c:40:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
      40 |         int len;
         |             ^~~
     'spmi_mfd_nvmem_probe': event 1
       |
       |   40 |         int len;
       |      |             ^~~
       |      |             |
       |      |             (1) use of uninitialized value '<unknown>' here
       |

vim +40 drivers/nvmem/spmi-mfd-nvmem.c

7d8a1a4c3dddcd Hector Martin 2022-02-15  35  
7d8a1a4c3dddcd Hector Martin 2022-02-15  36  static int spmi_mfd_nvmem_probe(struct platform_device *pdev)
7d8a1a4c3dddcd Hector Martin 2022-02-15  37  {
7d8a1a4c3dddcd Hector Martin 2022-02-15  38  	struct spmi_mfd_nvmem *nvmem;
7d8a1a4c3dddcd Hector Martin 2022-02-15  39  	const __be32 *addr;
7d8a1a4c3dddcd Hector Martin 2022-02-15 @40  	int len;
7d8a1a4c3dddcd Hector Martin 2022-02-15  41  	struct nvmem_config nvmem_cfg = {
7d8a1a4c3dddcd Hector Martin 2022-02-15  42  		.dev = &pdev->dev,
7d8a1a4c3dddcd Hector Martin 2022-02-15  43  		.name = "spmi_mfd_nvmem",
7d8a1a4c3dddcd Hector Martin 2022-02-15  44  		.id = NVMEM_DEVID_AUTO,
7d8a1a4c3dddcd Hector Martin 2022-02-15  45  		.word_size = 1,
7d8a1a4c3dddcd Hector Martin 2022-02-15  46  		.stride = 1,
7d8a1a4c3dddcd Hector Martin 2022-02-15  47  		.reg_read = spmi_mfd_nvmem_read,
7d8a1a4c3dddcd Hector Martin 2022-02-15  48  		.reg_write = spmi_mfd_nvmem_write,
7d8a1a4c3dddcd Hector Martin 2022-02-15  49  	};
7d8a1a4c3dddcd Hector Martin 2022-02-15  50  
7d8a1a4c3dddcd Hector Martin 2022-02-15  51  	nvmem = devm_kzalloc(&pdev->dev, sizeof(*nvmem), GFP_KERNEL);
7d8a1a4c3dddcd Hector Martin 2022-02-15  52  	if (!nvmem)
7d8a1a4c3dddcd Hector Martin 2022-02-15  53  		return -ENOMEM;
7d8a1a4c3dddcd Hector Martin 2022-02-15  54  
7d8a1a4c3dddcd Hector Martin 2022-02-15  55  	nvmem_cfg.priv = nvmem;
7d8a1a4c3dddcd Hector Martin 2022-02-15  56  
7d8a1a4c3dddcd Hector Martin 2022-02-15  57  	nvmem->regmap = dev_get_regmap(pdev->dev.parent, NULL);
7d8a1a4c3dddcd Hector Martin 2022-02-15  58  	if (!nvmem->regmap) {
7d8a1a4c3dddcd Hector Martin 2022-02-15  59  		dev_err(&pdev->dev, "Parent regmap unavailable.\n");
7d8a1a4c3dddcd Hector Martin 2022-02-15  60  		return -ENXIO;
7d8a1a4c3dddcd Hector Martin 2022-02-15  61  	}
7d8a1a4c3dddcd Hector Martin 2022-02-15  62  
7d8a1a4c3dddcd Hector Martin 2022-02-15  63  	addr = of_get_property(pdev->dev.of_node, "reg", &len);
7d8a1a4c3dddcd Hector Martin 2022-02-15  64  	if (!addr) {
7d8a1a4c3dddcd Hector Martin 2022-02-15  65  		dev_err(&pdev->dev, "no reg property\n");
7d8a1a4c3dddcd Hector Martin 2022-02-15  66  		return -EINVAL;
7d8a1a4c3dddcd Hector Martin 2022-02-15  67  	}
7d8a1a4c3dddcd Hector Martin 2022-02-15  68  	if (len != 2 * sizeof(u32)) {
7d8a1a4c3dddcd Hector Martin 2022-02-15  69  		dev_err(&pdev->dev, "invalid reg property\n");
7d8a1a4c3dddcd Hector Martin 2022-02-15  70  		return -EINVAL;
7d8a1a4c3dddcd Hector Martin 2022-02-15  71  	}
7d8a1a4c3dddcd Hector Martin 2022-02-15  72  
7d8a1a4c3dddcd Hector Martin 2022-02-15  73  	nvmem->base = be32_to_cpup(&addr[0]);
7d8a1a4c3dddcd Hector Martin 2022-02-15  74  	nvmem_cfg.size = be32_to_cpup(&addr[1]);
7d8a1a4c3dddcd Hector Martin 2022-02-15  75  
7d8a1a4c3dddcd Hector Martin 2022-02-15  76  	return PTR_ERR_OR_ZERO(devm_nvmem_register(&pdev->dev, &nvmem_cfg));
7d8a1a4c3dddcd Hector Martin 2022-02-15  77  }
7d8a1a4c3dddcd Hector Martin 2022-02-15  78  

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