linux-kernel - Re: [PATCH net-next 1/4] net: mv643xx_eth: Do not clobber PHY link outside of state machine

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Message-ID: <20170207001325.GC30169@lunn.ch>
Date:   Tue, 7 Feb 2017 01:13:25 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, zefir.kurtisi@...atec.com,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Wingman Kwok <w-kwok2@...com>,
        Murali Karicheri <m-karicheri2@...com>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        "David S. Miller" <davem@...emloft.net>,
        Philippe Reynes <tremyfr@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Jisheng Zhang <jszhang@...vell.com>,
        Jarod Wilson <jarod@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/4] net: mv643xx_eth: Do not clobber PHY link
 outside of state machine

On Mon, Feb 06, 2017 at 03:55:20PM -0800, Florian Fainelli wrote:
> Calling phy_read_status() means that we may call into
> genphy_read_status() which in turn will use genphy_update_link() which
> can make changes to phydev->link outside of the state machine's state
> transitions. This is an invalid behavior that is now caught as of
> 811a919135b9 ("phy state machine: failsafe leave invalid RUNNING state")
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew