linux-kernel - [kabel:net-queue-work 61/74] drivers/net/phy/marvell10g.c:514:3: warning: variable 'priv' is uninitialized when used here

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Message-ID: <202111070646.E0QKehBA-lkp@intel.com>
Date:   Sun, 7 Nov 2021 06:52:55 +0800
From:   kernel test robot <lkp@...el.com>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Marek Behún <kabel@...nel.org>
Subject: [kabel:net-queue-work 61/74] drivers/net/phy/marvell10g.c:514:3:
 warning: variable 'priv' is uninitialized when used here

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git net-queue-work
head:   402bab37786daa196ed983b84b37c7c8e4a4e90f
commit: 28b417cdb278d693f59f1206fe60e34db565b63a [61/74] net: phy: marvell10g: allow PHY to probe without firmware
config: riscv-buildonly-randconfig-r001-20211106 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 627868263cd4d57c230b61904483a3dad9e1a1da)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git/commit/?id=28b417cdb278d693f59f1206fe60e34db565b63a
        git remote add kabel https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git
        git fetch --no-tags kabel net-queue-work
        git checkout 28b417cdb278d693f59f1206fe60e34db565b63a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 

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

All warnings (new ones prefixed by >>):

>> drivers/net/phy/marvell10g.c:514:3: warning: variable 'priv' is uninitialized when used here [-Wuninitialized]
                   priv->firmware_failed = true;
                   ^~~~
   drivers/net/phy/marvell10g.c:499:26: note: initialize the variable 'priv' to silence this warning
           struct mv3310_priv *priv;
                                   ^
                                    = NULL
   1 warning generated.


vim +/priv +514 drivers/net/phy/marvell10g.c

   495	
   496	static int mv3310_probe(struct phy_device *phydev)
   497	{
   498		const struct mv3310_chip *chip = to_mv3310_chip(phydev);
   499		struct mv3310_priv *priv;
   500		u32 mmd_mask = MDIO_DEVS_PMAPMD | MDIO_DEVS_AN;
   501		int ret;
   502	
   503		if (!phydev->is_c45 ||
   504		    (phydev->c45_ids.devices_in_package & mmd_mask) != mmd_mask)
   505			return -ENODEV;
   506	
   507		ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MV_PMA_BOOT);
   508		if (ret < 0)
   509			return ret;
   510	
   511		if (ret & MV_PMA_BOOT_FATAL) {
   512			dev_warn(&phydev->mdio.dev,
   513				 "PHY failed to boot firmware, status=%04x\n", ret);
 > 514			priv->firmware_failed = true;
   515		}
   516	
   517		priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
   518		if (!priv)
   519			return -ENOMEM;
   520	
   521		dev_set_drvdata(&phydev->mdio.dev, priv);
   522	
   523		ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MV_PMA_FW_VER0);
   524		if (ret < 0)
   525			return ret;
   526	
   527		priv->firmware_ver = ret << 16;
   528	
   529		ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MV_PMA_FW_VER1);
   530		if (ret < 0)
   531			return ret;
   532	
   533		priv->firmware_ver |= ret;
   534	
   535		phydev_info(phydev, "Firmware version %u.%u.%u.%u\n",
   536			    priv->firmware_ver >> 24, (priv->firmware_ver >> 16) & 255,
   537			    (priv->firmware_ver >> 8) & 255, priv->firmware_ver & 255);
   538	
   539		if (chip->has_downshift)
   540			priv->has_downshift = chip->has_downshift(phydev);
   541	
   542		/* Powering down the port when not in use saves about 600mW */
   543		ret = mv3310_power_down(phydev);
   544		if (ret)
   545			return ret;
   546	
   547		ret = mv3310_hwmon_probe(phydev);
   548		if (ret)
   549			return ret;
   550	
   551		chip->init_supported_interfaces(phydev->supported_interfaces);
   552	
   553		return phy_sfp_probe(phydev, &mv3310_sfp_ops);
   554	}
   555	

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

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