netdev - Re: [PATCH net-next 1/3] net: dsa: sja1105: allow XPCS to handle mdiodev lifetime

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Date: Fri, 2 Jun 2023 17:30:20 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jose Abreu <Jose.Abreu@...opsys.com>, netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next 1/3] net: dsa: sja1105: allow XPCS to handle
 mdiodev lifetime

On Fri, Jun 02, 2023 at 02:58:35PM +0100, Russell King (Oracle) wrote:
> Put the mdiodev after xpcs_create() so that the XPCS driver can manage
> the lifetime of the mdiodev its using.

nitpick: "it's using"

> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> ---
>  drivers/net/dsa/sja1105/sja1105_mdio.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/sja1105/sja1105_mdio.c b/drivers/net/dsa/sja1105/sja1105_mdio.c
> index 01f1cb719042..166fe747f70a 100644
> --- a/drivers/net/dsa/sja1105/sja1105_mdio.c
> +++ b/drivers/net/dsa/sja1105/sja1105_mdio.c
> @@ -417,6 +417,7 @@ static int sja1105_mdiobus_pcs_register(struct sja1105_private *priv)
>  		}
>  
>  		xpcs = xpcs_create(mdiodev, priv->phy_mode[port]);
> +		mdio_device_put(mdiodev);
>  		if (IS_ERR(xpcs)) {
>  			rc = PTR_ERR(xpcs);
>  			goto out_pcs_free;
> @@ -434,7 +435,6 @@ static int sja1105_mdiobus_pcs_register(struct sja1105_private *priv)
>  		if (!priv->xpcs[port])
>  			continue;
>  
> -		mdio_device_free(priv->xpcs[port]->mdiodev);
>  		xpcs_destroy(priv->xpcs[port]);
>  		priv->xpcs[port] = NULL;
>  	}
> @@ -457,7 +457,6 @@ static void sja1105_mdiobus_pcs_unregister(struct sja1105_private *priv)
>  		if (!priv->xpcs[port])
>  			continue;
>  
> -		mdio_device_free(priv->xpcs[port]->mdiodev);
>  		xpcs_destroy(priv->xpcs[port]);
>  		priv->xpcs[port] = NULL;
>  	}
> -- 
> 2.30.2
> 

So before this patch, sja1105 was using xpcs with an mdiodev refcount
of 2 (a transition phase after commit 9a5d500cffdb ("net: pcs: xpcs: add
xpcs_create_mdiodev()")), and now it's back to using it with a refcount
of 1? okay.

Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
Tested-by: Vladimir Oltean <vladimir.oltean@....com>