Re: [PATCH RFC] PCI: Convert devm_pci_alloc_host_bridge() users to error-pointer returns

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

Hi Alok,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on pci/for-linus]
[also build test ERROR on linus/master v6.17-rc6]
[cannot apply to pci/next next-20250919]
[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/Alok-Tiwari/PCI-Convert-devm_pci_alloc_host_bridge-users-to-error-pointer-returns/20250922-001734
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git for-linus
patch link:    https://lore.kernel.org/r/20250921161434.1561770-1-alok.a.tiwari%40oracle.com
patch subject: [PATCH RFC] PCI: Convert devm_pci_alloc_host_bridge() users to error-pointer returns
config: um-randconfig-002-20250922 (https://download.01.org/0day-ci/archive/20250922/202509220322.JzCVMkDb-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project efd96afedf2c0f6f2cc34cf5a9a7e3e78f592255)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250922/202509220322.JzCVMkDb-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/202509220322.JzCVMkDb-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/pci/controller/pcie-mediatek-gen3.c:13:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:12:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:1175:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
    1175 |         return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
         |                                                   ~~~~~~~~~~ ^
>> drivers/pci/controller/pcie-mediatek-gen3.c:1178:21: error: use of undeclared identifier 'bridge'
    1178 |         if (IS_ERR_OR_NULL(bridge))
         |                            ^~~~~~
   drivers/pci/controller/pcie-mediatek-gen3.c:1179:18: error: use of undeclared identifier 'bridge'
    1179 |                 return PTR_ERR(bridge);
         |                                ^~~~~~
   1 warning and 2 errors generated.
--
   In file included from drivers/pci/controller/pci-tegra.c:21:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/um/include/asm/hardirq.h:5:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:12:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:1175:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
    1175 |         return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
         |                                                   ~~~~~~~~~~ ^
>> drivers/pci/controller/pci-tegra.c:2571:21: error: use of undeclared identifier 'bridge'
    2571 |         if (IS_ERR_OR_NULL(bridge))
         |                            ^~~~~~
   drivers/pci/controller/pci-tegra.c:2572:18: error: use of undeclared identifier 'bridge'
    2572 |                 return PTR_ERR(bridge);
         |                                ^~~~~~
   1 warning and 2 errors generated.


vim +/bridge +1178 drivers/pci/controller/pcie-mediatek-gen3.c

  1169	
  1170	static int mtk_pcie_probe(struct platform_device *pdev)
  1171	{
  1172		struct device *dev = &pdev->dev;
  1173		struct mtk_gen3_pcie *pcie;
  1174		struct pci_host_bridge *host;
  1175		int err;
  1176	
  1177		host = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
> 1178		if (IS_ERR_OR_NULL(bridge))
  1179			return PTR_ERR(bridge);
  1180	
  1181		pcie = pci_host_bridge_priv(host);
  1182	
  1183		pcie->dev = dev;
  1184		pcie->soc = device_get_match_data(dev);
  1185		platform_set_drvdata(pdev, pcie);
  1186	
  1187		err = mtk_pcie_setup(pcie);
  1188		if (err)
  1189			return err;
  1190	
  1191		host->ops = &mtk_pcie_ops;
  1192		host->sysdata = pcie;
  1193	
  1194		err = pci_host_probe(host);
  1195		if (err) {
  1196			mtk_pcie_irq_teardown(pcie);
  1197			mtk_pcie_power_down(pcie);
  1198			return err;
  1199		}
  1200	
  1201		return 0;
  1202	}
  1203	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki