netdev - Re: [PATCH net-next] net: phy: avoid kernel warning dump when stopping an errored PHY

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Date: Mon, 22 May 2023 12:03:06 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
 Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: phy: avoid kernel warning dump when
 stopping an errored PHY

On 5/22/23 08:58, Russell King (Oracle) wrote:
> When taking a network interface down (or removing a SFP module) after
> the PHY has encountered an error, phy_stop() complains incorrectly
> that it was called from HALTED state.
> 
> The reason this is incorrect is that the network driver will have
> called phy_start() when the interface was brought up, and the fact
> that the PHY has a problem bears no relationship to the administrative
> state of the interface. Taking the interface administratively down
> (which calls phy_stop()) is always the right thing to do after a
> successful phy_start() call, whether or not the PHY has encountered
> an error.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Acked-by: Florian Fainelli <f.fainelli@...il.com>

I would argue that the entire phy_error() needs a revamp, yes it's 
important to know if we have an error "talking" to the PHY, but there is 
no much that is being actionable in other situations than pluggable SFP 
modules.
-- 
Florian