linux-kernel - Re: [PATCH net-next v4 5/9] net: dsa: microchip: ksz9477: Add Wake on Magic Packet support

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Message-ID: <e1d812ec-98d1-491a-aa03-ca3d39292c25@lunn.ch>
Date:   Tue, 17 Oct 2023 03:42:43 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        UNGLinuxDriver@...rochip.com,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v4 5/9] net: dsa: microchip: ksz9477: Add Wake
 on Magic Packet support

> -	wol->supported = WAKE_PHY;
> +	wol->supported = WAKE_PHY | WAKE_MAGIC;

It is clearly racy, but maybe try a ksz_switch_macaddr_get() and only
if it is successful add WAKE_MAGIC. Then do a
ksz_switch_macaddr_put(). Given the limitations of the hardware, it
might help the user understand what the hardware can do.

But this is not a must.

    Andrew