[asahilinux:dart/dev 3/4] drivers/iommu/apple-dart-iommu.c:776:52: warning: variable 'i' is uninitialized when used here

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

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tree:   https://github.com/AsahiLinux/linux dart/dev
head:   8e50fc895233f960967b879dbcccf85f20da023f
commit: fccb340722b1082ef97d03a0f1427ef2ee9d5e32 [3/4] iommu: dart: Add DART iommu driver
config: arm64-randconfig-r014-20210531 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project bc6799f2f79f0ae87e9f1ebf9d25ba799fbd25a9)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/AsahiLinux/linux/commit/fccb340722b1082ef97d03a0f1427ef2ee9d5e32
        git remote add asahilinux https://github.com/AsahiLinux/linux
        git fetch --no-tags asahilinux dart/dev
        git checkout fccb340722b1082ef97d03a0f1427ef2ee9d5e32
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> drivers/iommu/apple-dart-iommu.c:776:52: warning: variable 'i' is uninitialized when used here [-Wuninitialized]
           res = platform_get_resource(pdev, IORESOURCE_MEM, i);
                                                             ^
   drivers/iommu/apple-dart-iommu.c:760:7: note: initialize the variable 'i' to silence this warning
           int i;
                ^
                 = 0
   1 warning generated.


vim +/i +776 drivers/iommu/apple-dart-iommu.c

   756	
   757	static int apple_dart_probe(struct platform_device *pdev)
   758	{
   759		int ret;
   760		int i;
   761		u32 dart_info;
   762		struct resource *res;
   763		struct apple_dart *dart;
   764		struct device *dev = &pdev->dev;
   765	
   766		dart = devm_kzalloc(dev, sizeof(*dart), GFP_KERNEL);
   767		if (!dart)
   768			return -ENOMEM;
   769	
   770		dart->dev = dev;
   771		spin_lock_init(&dart->lock);
   772	
   773		if (pdev->num_resources < 1)
   774			return -ENODEV;
   775	
 > 776		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
   777		if (resource_size(res) < 0x4000) {
   778			dev_err(dev, "MMIO region too small (%pr)\n", res);
   779			return -EINVAL;
   780		}
   781	
   782		dart->regs = devm_ioremap_resource(dev, res);
   783		if (IS_ERR(dart->regs))
   784			return PTR_ERR(dart->regs);
   785	
   786		ret = devm_clk_bulk_get_all(dev, &dart->clks);
   787		if (ret < 0)
   788			return ret;
   789		dart->num_clks = ret;
   790	
   791		ret = clk_bulk_prepare_enable(dart->num_clks, dart->clks);
   792		if (ret)
   793			return ret;
   794	
   795		ret = apple_dart_hw_reset(dart);
   796		if (ret)
   797			return ret;
   798	
   799		dart_info = readl(dart->regs + DART_INFO);
   800		dart->pgsize = 1 << FIELD_GET(DART_INFO_PAGE_SHIFT, dart_info);
   801	
   802		dart->irq = platform_get_irq(pdev, 0);
   803		if (dart->irq < 0)
   804			return -ENODEV;
   805	
   806		ret = devm_request_irq(dart->dev, dart->irq, apple_dart_irq,
   807				       IRQF_SHARED, "apple-dart fault handler", dart);
   808		if (ret)
   809			return ret;
   810	
   811		platform_set_drvdata(pdev, dart);
   812	
   813		ret = iommu_device_sysfs_add(&dart->iommu, dev, NULL, "apple-dart.%s",
   814					     dev_name(&pdev->dev));
   815		if (ret)
   816			return ret;
   817	
   818		ret = iommu_device_register(&dart->iommu, &apple_dart_iommu_ops, dev);
   819		if (ret)
   820			return ret;
   821	
   822		if (dev->bus->iommu_ops != &apple_dart_iommu_ops) {
   823			ret = bus_set_iommu(dev->bus, &apple_dart_iommu_ops);
   824			if (ret)
   825				return ret;
   826		}
   827	
   828		return 0;
   829	}
   830	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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