Re: [PATCH net-next v3 06/14] sfc: implement vDPA management device operations

[kernel test robot]

Hi Gautam,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Gautam-Dawar/sfc-add-function-personality-support-for-EF100-devices/20230406-151436
patch link:    https://lore.kernel.org/r/20230406065706.59664-7-gautam.dawar%40amd.com
patch subject: [PATCH net-next v3 06/14] sfc: implement vDPA management device operations
config: x86_64-randconfig-a002-20230403 (https://download.01.org/0day-ci/archive/20230406/202304062258.oIHz9siw-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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/intel-lab-lkp/linux/commit/0887a40c60d1983214d417491dc9ef46191ab1ac
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Gautam-Dawar/sfc-add-function-personality-support-for-EF100-devices/20230406-151436
        git checkout 0887a40c60d1983214d417491dc9ef46191ab1ac
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/ethernet/sfc/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304062258.oIHz9siw-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/sfc/ef100_vdpa.c:184:12: warning: variable 'efx' is uninitialized when used here [-Wuninitialized]
                           pci_err(efx->pci_dev, "Invalid MAC address %pM\n",
                                   ^~~
   include/linux/pci.h:2548:46: note: expanded from macro 'pci_err'
   #define pci_err(pdev, fmt, arg...)      dev_err(&(pdev)->dev, fmt, ##arg)
                                                     ^~~~
   include/linux/dev_printk.h:144:44: note: expanded from macro 'dev_err'
           dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
                                                     ^~~
   include/linux/dev_printk.h:110:11: note: expanded from macro 'dev_printk_index_wrap'
                   _p_func(dev, fmt, ##__VA_ARGS__);                       \
                           ^~~
   drivers/net/ethernet/sfc/ef100_vdpa.c:179:21: note: initialize the variable 'efx' to silence this warning
           struct efx_nic *efx;
                              ^
                               = NULL
   1 warning generated.


vim +/efx +184 drivers/net/ethernet/sfc/ef100_vdpa.c

   171	
   172	static int ef100_vdpa_net_dev_add(struct vdpa_mgmt_dev *mgmt_dev,
   173					  const char *name,
   174					  const struct vdpa_dev_set_config *config)
   175	{
   176		struct ef100_vdpa_nic *vdpa_nic;
   177		struct ef100_nic_data *nic_data;
   178		const u8 *mac = NULL;
   179		struct efx_nic *efx;
   180		int rc, err;
   181	
   182		if (config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
   183			if (!is_valid_ether_addr(config->net.mac)) {
 > 184				pci_err(efx->pci_dev, "Invalid MAC address %pM\n",
   185					config->net.mac);
   186				return -EINVAL;
   187			}
   188			mac = (const u8 *)config->net.mac;
   189		}
   190	
   191		efx = pci_get_drvdata(to_pci_dev(mgmt_dev->device));
   192		if (efx->vdpa_nic) {
   193			pci_warn(efx->pci_dev,
   194				 "vDPA device already exists on this VF\n");
   195			return -EEXIST;
   196		}
   197	
   198		nic_data = efx->nic_data;
   199	
   200		rc = efx_ef100_set_bar_config(efx, EF100_BAR_CONFIG_VDPA);
   201		if (rc) {
   202			pci_err(efx->pci_dev,
   203				"set_bar_config vDPA failed, err: %d\n", rc);
   204			goto err_set_bar_config;
   205		}
   206	
   207		vdpa_nic = ef100_vdpa_create(efx, name, EF100_VDPA_CLASS_NET, mac);
   208		if (IS_ERR(vdpa_nic)) {
   209			pci_err(efx->pci_dev,
   210				"vDPA device creation failed, vf: %u, err: %ld\n",
   211				nic_data->vf_index, PTR_ERR(vdpa_nic));
   212			rc = PTR_ERR(vdpa_nic);
   213			goto err_set_bar_config;
   214		} else {
   215			pci_dbg(efx->pci_dev,
   216				"vdpa net device created, vf: %u\n",
   217				nic_data->vf_index);
   218		}
   219	
   220		return 0;
   221	
   222	err_set_bar_config:
   223		err = efx_ef100_set_bar_config(efx, EF100_BAR_CONFIG_EF100);
   224		if (err)
   225			pci_err(efx->pci_dev,
   226				"set_bar_config EF100 failed, err: %d\n", err);
   227	
   228		return rc;
   229	}
   230	

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