linux-kernel - Re: [PATCH net-next 04/12] net: dpaa2-mac: remove defensive check in dpaa2_mac

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Message-ID: <Y4ZUwlGPZZCEDUp9@lunn.ch>
Date:   Tue, 29 Nov 2022 19:51:46 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, Ioana Ciornei <ioana.ciornei@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 04/12] net: dpaa2-mac: remove defensive check in
 dpaa2_mac_disconnect()

On Tue, Nov 29, 2022 at 04:12:13PM +0200, Vladimir Oltean wrote:
> dpaa2_mac_disconnect() will only be called with a NULL mac->phylink if
> dpaa2_mac_connect() failed, or was never called.
> 
> The callers are these:
> 
> dpaa2_eth_disconnect_mac():
> 
> 	if (dpaa2_eth_is_type_phy(priv))
> 		dpaa2_mac_disconnect(priv->mac);
> 
> dpaa2_switch_port_disconnect_mac():
> 
> 	if (dpaa2_switch_port_is_type_phy(port_priv))
> 		dpaa2_mac_disconnect(port_priv->mac);
> 
> priv->mac can be NULL, but in that case, dpaa2_eth_is_type_phy() returns
> false, and dpaa2_mac_disconnect() is never called. Similar for
> dpaa2-switch.
> 
> When priv->mac is non-NULL, it means that dpaa2_mac_connect() returned
> zero (success), and therefore, priv->mac->phylink is also a valid
> pointer.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew