linux-kernel - Re: [PATCH v2 3/5] net: dsa: complete dsa_switch

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Date:	Tue, 6 Oct 2015 08:23:28 +0100
From:	Neil Armstrong <narmstrong@...libre.com>
To:	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Guenter Roeck <linux@...ck-us.net>,
	vivien.didelot@...oirfairelinux.com, Andrew Lunn <andrew@...n.ch>,
	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, nbd@...nwrt.org,
	sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH v2 3/5] net: dsa: complete dsa_switch_destroy

On 10/03/2015 09:25 PM, Florian Fainelli wrote:
> Le 03/10/2015 07:26, Neil Armstrong a écrit :
>> When unbinding dsa, complete the dsa_switch_destroy to unregister the
>> fixed link phy then cleanly unregister and destroy the net devices.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
> 
> [snip]
> 
>> +		port_dn = cd->port_dn[port];
>> +		if (of_phy_is_fixed_link(port_dn)) {
>> +			phydev = of_phy_find_device(port_dn);
>> +			if (phydev) {
>> +				int addr = phydev->addr;
>> +				phy_device_free(phydev);
>> +				of_node_put(port_dn);
>> +				fixed_phy_del(addr);
> 
> fixed_phy_del() removes the fixed PHY from the platform fixed MDIO bus
> list of PHYs, so we should be okay even with switch drivers which
> register a link_update callback via fixed_phy_set_link_update(), but I
> have not checked that. The sequence of call looks (phy_device_free then
> fixed_phy_del) looks sane though.
Actually I copied the exact sequence from the fixed link module, eventually this should be done in this module with a proper fixed_link_remove function.

> 
> Eventually this logic might be better moved into net/dsa/slave.c such
> that it is easy to see how it balances dsa_slave_phy_setup().
> 
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> 

Thanks for the review,

Neil
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