Re: [RFC PATCH net-next 2/3] net: dsa: destroy the phylink instance on any error in dsa_slave_phy_setup

[Florian Fainelli]

On 9/1/2021 3:50 PM, Vladimir Oltean wrote:
> DSA supports connecting to a phy-handle, and has a fallback to a non-OF
> based method of connecting to an internal PHY on the switch's own MDIO
> bus, if no phy-handle and no fixed-link nodes were present.
>
> The -ENODEV error code from the first attempt (phylink_of_phy_connect)
> is what triggers the second attempt (phylink_connect_phy).
>
> However, when the first attempt returns a different error code than
> -ENODEV, this results in an unbalance of calls to phylink_create and
> phylink_destroy by the time we exit the function. The phylink instance
> has leaked.
>
> There are many other error codes that can be returned by
> phylink_of_phy_connect. For example, phylink_validate returns -EINVAL.
> So this is a practical issue too.
>
> Fixes: aab9c4067d23 ("net: dsa: Plug in PHYLINK support")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>

Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
--
Florian