linux-kernel - Re: [PATCH v10 04/10] PCI: cadence: Add support for High Perf Architecture (HPA) controller

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Message-ID: <202510201553.x7S0SaZ1-lkp@intel.com>
Date: Mon, 20 Oct 2025 15:19:34 +0800
From: kernel test robot <lkp@...el.com>
To: hans.zhang@...tech.com, bhelgaas@...gle.com, helgaas@...nel.org,
	lpieralisi@...nel.org, kw@...ux.com, mani@...nel.org,
	robh@...nel.org, kwilczynski@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	mpillai@...ence.com, fugang.duan@...tech.com,
	guoyin.chen@...tech.com, peter.chen@...tech.com,
	cix-kernel-upstream@...tech.com, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Hans Zhang <hans.zhang@...tech.com>
Subject: Re: [PATCH v10 04/10] PCI: cadence: Add support for High Perf
 Architecture (HPA) controller

Hi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 211ddde0823f1442e4ad052a2f30f050145ccada]

url:    https://github.com/intel-lab-lkp/linux/commits/hans-zhang-cixtech-com/PCI-cadence-Add-module-support-for-platform-controller-driver/20251020-123246
base:   211ddde0823f1442e4ad052a2f30f050145ccada
patch link:    https://lore.kernel.org/r/20251020042857.706786-5-hans.zhang%40cixtech.com
patch subject: [PATCH v10 04/10] PCI: cadence: Add support for High Perf Architecture (HPA) controller
config: i386-buildonly-randconfig-002-20251020 (https://download.01.org/0day-ci/archive/20251020/202510201553.x7S0SaZ1-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251020/202510201553.x7S0SaZ1-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510201553.x7S0SaZ1-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/pci/controller/cadence/pcie-cadence-host-hpa.c:96:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
      96 |         if (rc->quirk_retrain_flag)
         |             ^~~~~~~~~~~~~~~~~~~~~~
   drivers/pci/controller/cadence/pcie-cadence-host-hpa.c:98:9: note: uninitialized use occurs here
      98 |         return ret;
         |                ^~~
   drivers/pci/controller/cadence/pcie-cadence-host-hpa.c:96:2: note: remove the 'if' if its condition is always true
      96 |         if (rc->quirk_retrain_flag)
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
      97 |                 ret = cdns_pcie_retrain(pcie);
   drivers/pci/controller/cadence/pcie-cadence-host-hpa.c:84:18: note: initialize the variable 'ret' to silence this warning
      84 |         int retries, ret;
         |                         ^
         |                          = 0
   1 warning generated.


vim +96 drivers/pci/controller/cadence/pcie-cadence-host-hpa.c

    79	
    80	static int cdns_pcie_hpa_host_wait_for_link(struct cdns_pcie *pcie)
    81	{
    82		struct device *dev = pcie->dev;
    83		struct cdns_pcie_rc *rc;
    84		int retries, ret;
    85	
    86		rc = container_of(pcie, struct cdns_pcie_rc, pcie);
    87	
    88		/* Check if the link is up or not */
    89		for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
    90			if (cdns_pcie_hpa_link_up(pcie)) {
    91				dev_info(dev, "Link up\n");
    92				return 0;
    93			}
    94			usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
    95		}
  > 96		if (rc->quirk_retrain_flag)
    97			ret = cdns_pcie_retrain(pcie);
    98		return ret;
    99	}
   100	

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