linux-kernel - Re: [PATCH v4.3] net: phy: Add driver for Motorcomm yt8521 gigabit ethernet phy

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Date:   Tue, 16 Aug 2022 20:04:47 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Frank <Frank.Sae@...or-comm.com>
Cc:     Peter Geis <pgwipeout@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, yinghong.zhang@...or-comm.com,
        fei.zhang@...or-comm.com, hua.sun@...or-comm.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4.3] net: phy: Add driver for Motorcomm yt8521 gigabit
 ethernet phy

On Tue, 16 Aug 2022 19:17:03 +0800 Frank wrote:
>  Add a driver for the motorcomm yt8521 gigabit ethernet phy. We have verified
>  the driver on StarFive VisionFive development board, which is developed by
>  Shanghai StarFive Technology Co., Ltd.. On the board, yt8521 gigabit ethernet
>  phy works in utp mode, RGMII interface, supports 1000M/100M/10M speeds, and
>  wol(magic package).

Clang reports:

drivers/net/phy/motorcomm.c:1121:6: warning: variable 'changed' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
        if (err > 0)
            ^~~~~~~
drivers/net/phy/motorcomm.c:1124:47: note: uninitialized use occurs here
        return genphy_check_and_restart_aneg(phydev, changed);
                                                     ^~~~~~~
drivers/net/phy/motorcomm.c:1121:2: note: remove the 'if' if its condition is always true
        if (err > 0)
        ^~~~~~~~~~~~
drivers/net/phy/motorcomm.c:1095:18: note: initialize the variable 'changed' to silence this warning
        int err, changed;
                        ^
                         = 0