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

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Message-ID: <38c43119-4158-4be8-8919-f6890a5f4722@lunn.ch>
Date: Mon, 12 Aug 2024 23:42:54 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Rosen Penev <rosenp@...il.com>
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 02:35:45PM -0700, Rosen Penev wrote:
> 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?

If you use devm_of_mdiobus_register(), the device core will call
devm_mdiobus_unregister() on remove. Your patch removed
mdiobus_unregister() in remove....

Is there any user of ag->mii_bus left after converting to
devm_of_mdiobus_register()?

	Andrew