netdev - Re: [PATCH net-next] net: phy: phy_link_topology: Handle NULL topologies

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Message-ID: <171292699033.4917.4025686054785818967@kwain>
Date: Fri, 12 Apr 2024 15:03:10 +0200
From: Antoine Tenart <atenart@...nel.org>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>, davem@...emloft.net
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Russell King <linux@...linux.org.uk>, linux-arm-kernel@...ts.infradead.org, Christophe Leroy <christophe.leroy@...roup.eu>, Herve Codina <herve.codina@...tlin.com>, Florian Fainelli <f.fainelli@...il.com>, Heiner Kallweit <hkallweit1@...il.com>, Vladimir Oltean <vladimir.oltean@....com>, Köry Maincent <kory.maincent@...tlin.com>, Jesse Brandeburg <jesse.brandeburg@...el.com>, Marek Behún <kabel@...nel.org>, Piergiorgio Beruto <piergiorgio.beruto@...il.com>, Oleksij Rempel <o.rempel@...gutronix.de>, Nicolò Veronese <nicveronese@...il.com>, Simon Horman <horms@...nel.org>, mwojtas@...omium.org, Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH net-next] net: phy: phy_link_topology: Handle NULL topologies

Hi Maxime,

Quoting Maxime Chevallier (2024-04-12 12:46:14)
> 
> This patch fixes a commit that is in net-next, hence the net-next tag and the
> lack of "Fixes" tag.

You can use Fixes: on net-next, that still helps to identify which
commit is being fixed (eg. for reviews, while looking at the history,
etc).

> diff --git a/drivers/net/phy/phy_link_topology.c b/drivers/net/phy/phy_link_topology.c
> index 985941c5c558..0f3973f07fac 100644
> --- a/drivers/net/phy/phy_link_topology.c
> +++ b/drivers/net/phy/phy_link_topology.c
> @@ -42,6 +42,9 @@ int phy_link_topo_add_phy(struct phy_link_topology *topo,
>         struct phy_device_node *pdn;
>         int ret;
>  
> +       if (!topo)
> +               return 0;
> +

With that phy_sfp_connect_phy does not need to check the topo validity
before calling phy_link_topo_add_phy. The other way around is fine too.

> @@ -93,7 +96,12 @@ EXPORT_SYMBOL_GPL(phy_link_topo_add_phy);
>  void phy_link_topo_del_phy(struct phy_link_topology *topo,
>                            struct phy_device *phy)
>  {
> -       struct phy_device_node *pdn = xa_erase(&topo->phys, phy->phyindex);
> +       struct phy_device_node *pdn;
> +
> +       if (!topo)
> +               return;
> +
> +       pdn = xa_erase(&topo->phys, phy->phyindex);

Same here with phy_sfp_disconnect_phy.

Thanks!
Antoine