linux-kernel - Re: [PATCH v2] net: dsa: bcm_sf2: Propagate error value from mdio

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Message-ID: <201812270514.c1zdpEDe%fengguang.wu@intel.com>
Date:   Thu, 27 Dec 2018 05:01:40 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     kbuild-all@...org, kjlu@....edu, pakki001@....edu,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: dsa: bcm_sf2: Propagate error value from
 mdio_write

Hi Kangjie,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]
[also build test WARNING on v4.20 next-20181224]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Kangjie-Lu/net-dsa-bcm_sf2-Propagate-error-value-from-mdio_write/20181227-042915
config: x86_64-randconfig-x002-201851 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   drivers/net//dsa/bcm_sf2.c: In function 'bcm_sf2_sw_mdio_write':
>> drivers/net//dsa/bcm_sf2.c:310:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +310 drivers/net//dsa/bcm_sf2.c

461cd1b03 Florian Fainelli 2016-06-07  296  
461cd1b03 Florian Fainelli 2016-06-07  297  static int bcm_sf2_sw_mdio_write(struct mii_bus *bus, int addr, int regnum,
461cd1b03 Florian Fainelli 2016-06-07  298  				 u16 val)
461cd1b03 Florian Fainelli 2016-06-07  299  {
461cd1b03 Florian Fainelli 2016-06-07  300  	struct bcm_sf2_priv *priv = bus->priv;
461cd1b03 Florian Fainelli 2016-06-07  301  
461cd1b03 Florian Fainelli 2016-06-07  302  	/* Intercept writes to the Broadcom pseudo-PHY address, else,
461cd1b03 Florian Fainelli 2016-06-07  303  	 * send them to our master MDIO bus controller
461cd1b03 Florian Fainelli 2016-06-07  304  	 */
461cd1b03 Florian Fainelli 2016-06-07  305  	if (addr == BRCM_PSEUDO_PHY_ADDR && priv->indir_phy_mask & BIT(addr))
461cd1b03 Florian Fainelli 2016-06-07  306  		bcm_sf2_sw_indir_rw(priv, 0, addr, regnum, val);
461cd1b03 Florian Fainelli 2016-06-07  307  	else
9d3b8e48b Kangjie Lu       2018-12-26  308  		return mdiobus_write_nested(priv->master_mii_bus,
9d3b8e48b Kangjie Lu       2018-12-26  309  				addr, regnum, val);
461cd1b03 Florian Fainelli 2016-06-07 @310  }
461cd1b03 Florian Fainelli 2016-06-07  311  

:::::: The code at line 310 was first introduced by commit
:::::: 461cd1b03e321e9c4ed1b831c80965c69a7b761b net: dsa: bcm_sf2: Register our slave MDIO bus

:::::: TO: Florian Fainelli <f.fainelli@...il.com>
:::::: CC: David S. Miller <davem@...emloft.net>

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