netdev - Re: [PATCH net-next v2] ethtool: Protect {get,set}_phy

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Message-ID: <20161123224305.GF12343@lunn.ch>
Date:   Wed, 23 Nov 2016 23:43:05 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        bcm-kernel-feedback-list@...adcom.com, allan.nielsen@...rosemi.com,
        raju.lakkaraju@...rosemi.com, vivien.didelot@...oirfairelinux.com
Subject: Re: [PATCH net-next v2] ethtool: Protect {get,set}_phy_tunable with
 PHY device mutex

On Tue, Nov 22, 2016 at 01:55:31PM -0800, Florian Fainelli wrote:
> PHY drivers should be able to rely on the caller of {get,set}_tunable to
> have acquired the PHY device mutex, in order to both serialize against
> concurrent calls of these functions, but also against PHY state machine
> changes. All ethtool PHY-level functions do this, except
> {get,set}_tunable, so we make them consistent here as well.
> 
> We need to update the Microsemi PHY driver in the same commit to avoid
> introducing either deadlocks, or lack of proper locking.
> 
> Fixes: 968ad9da7e0e ("ethtool: Implements ETHTOOL_PHY_GTUNABLE/ETHTOOL_PHY_STUNABLE")
> Fixes: 310d9ad57ae0 ("net: phy: Add downshift get/set support in Microsemi PHYs driver")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

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

    Andrew