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

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Date:	Sat, 3 Oct 2015 13:25:19 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Neil Armstrong <narmstrong@...libre.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

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.

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>
-- 
Florian
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