netdev - Re: ordering of check in phy_state_machine() since 06edf1a940be0633499e2feea31d380375a22bd9

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Message-ID: <20220331105134.GA7711@wunner.de>
Date:   Thu, 31 Mar 2022 12:51:34 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Oliver Neukum <oneukum@...e.com>
Cc:     Oleksij Rempel <linux@...pel-privat.de>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: ordering of check in phy_state_machine() since
 06edf1a940be0633499e2feea31d380375a22bd9

On Thu, Mar 31, 2022 at 12:33:30PM +0200, Oliver Neukum wrote:
> looking at this I wonder whether the check isn't too late.
> Do you really want to restart autonegotiation although
> you know that the device is gone?

Ignoring PHY_CABLETEST for a moment, needs_aneg is only set to
true if state is PHY_UP, i.e. the netdev was just opened.

If the USB adapter is unplugged at that moment, the expectation
is that phy_start_aneg() returns -ENODEV, so we bail out of
phy_state_machine().

Commit 06edf1a940be looks fine to me.

Thanks,

Lukas