netdev - Re: [PATCH] net: fec: Fix phy_device lookup for phy_reset_after_clk

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Date:   Fri, 9 Oct 2020 08:15:32 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Marek Vasut <marex@...x.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        Christoph Niedermaier <cniedermaier@...electronics.com>,
        "David S . Miller" <davem@...emloft.net>,
        NXP Linux Team <linux-imx@....com>,
        Richard Leitner <richard.leitner@...data.com>,
        Shawn Guo <shawnguo@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH] net: fec: Fix phy_device lookup for
 phy_reset_after_clk_enable()

On Fri, 9 Oct 2020 09:20:30 +0200 Marek Vasut wrote:
> > Can you describe your problem in detail?  
> 
> Yes, I tried to do that in the commit message and the extra detailed
> comment above the code. What exactly do you not understand from that?

Why it's not bound on the first open (I'm guessing it's the first open
that has the ndev->phydev == NULL? I shouldn't have to guess).

> > To an untrained eye this looks pretty weird.  
> 
> I see, I'm not quite sure how to address this comment.

If ndev->phydev sometimes is not-NULL on open, then that's a valid
state to be in. Why not make sure that we're always in that state 
and can depend on ndev->phydev rather than rummaging around for 
the phy_device instance.