linux-kernel - Re: [PATCH 6/6] net: phy: Stop 'phy-state-machine' and 'phy

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Date:	Tue, 27 Oct 2015 22:20:45 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Frode Isaksen <fisaksen@...libre.com>,
	Neil Armstrong <narmstrong@...libre.com>,
	"David S. Miller" <davem@...emloft.net>,
	Guenter Roeck <linux@...ck-us.net>,
	vivien.didelot@...oirfairelinux.com,
	Fabian Frederick <fabf@...net.be>,
	Pavel Nakonechny <pavel.nakonechny@...tlab.ru>,
	Joe Perches <joe@...ches.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] net: phy: Stop 'phy-state-machine' and 'phy_change'
 work on remove

On Tue, Oct 27, 2015 at 08:57:58AM -0700, Florian Fainelli wrote:
> (don't top post please)
> 
> On 27/10/15 08:53, Frode Isaksen wrote:
> > What will you need in the oops ? I presume you don' want everything or ?
> > 
> > The PHY state machine is not stopped with a PHY disconnect.
> 
> It is stopped with a phy_disconnect():
> 
> /**
>  * phy_disconnect - disable interrupts, stop state machine, and detach a PHY
>  *                  device
>  * @phydev: target phy_device struct
>  */
> void phy_disconnect(struct phy_device *phydev)
> {
>         if (phydev->irq > 0)
>                 phy_stop_interrupts(phydev);
> 
>         phy_stop_machine(phydev);
> 
>         phydev->adjust_link = NULL;
> 
>         phy_detach(phydev);
> }

And this does not yet get called. It probably needs to be in
dsa_switch_destroy() just before unregister_netdev() of the slave
devices.

However, the ordering in dsa_switch_destroy() looks wrong. The fixed
phys are destroyed before the slave devices. They should probably be
destroyed after the slave devices, or at least after the
phy_disconnect() is called.

		 Andrew
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