linux-kernel - Re: [PATCH net-next 2/3] net: ag71xx: use devm for of_mdiobus

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Message-ID: <CAKxU2N9p4DrbREqHuagmVS=evjK48SWE5NM3RbD5zF6D-H93kA@mail.gmail.com>
Date: Mon, 12 Aug 2024 14:35:45 -0700
From: Rosen Penev <rosenp@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, linux@...linux.org.uk, 
	linux-kernel@...r.kernel.org, o.rempel@...gutronix.de
Subject: Re: [PATCH net-next 2/3] net: ag71xx: use devm for of_mdiobus_register

On Mon, Aug 12, 2024 at 2:28 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Mon, Aug 12, 2024 at 12:06:52PM -0700, Rosen Penev wrote:
> > Allows removing ag71xx_mdio_remove.
> >
> > Removed local mii_bus variable and assign struct members directly.
> > Easier to reason about.
>
> This mixes up two different things, making the patch harder to
> review. Ideally you want lots of little patches, each doing one thing,
> and being obviously correct.
>
> Is ag->mii_bus actually used anywhere, outside of ag71xx_mdio_probe()?
> Often swapping to devm_ means the driver does not need to keep hold of
> the resources. So i actually think you can remove ag->mii_bus. This
> might of been more obvious if you had first swapped to
> devm_of_mdiobus_register() without the other changes mixed in.
not sure I follow. mdiobus_unregister would need to be called in
remove without devm. That would need a private mii_bus of some kind.
So with devm this is unneeded?
>
>     Andrew
>
> ---
> pw-bot: cr