netdev - Re: [PATCH 0/2] net: stmmac: allow sharing MDIO lines

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Date: Tue, 8 Aug 2023 16:27:07 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>
Cc: Andrew Halaney <ahalaney@...hat.com>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alex Elder <elder@...aro.org>,
	Srini Kandagatla <srinivas.kandagatla@...aro.org>,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 0/2] net: stmmac: allow sharing MDIO lines

On Tue, Aug 08, 2023 at 05:15:45PM +0200, Andrew Lunn wrote:
> > > > > Good point, but it's worse than that: when MAC0 is unbound, it will
> > > > > unregister the MDIO bus and destroy all PHY devices. These are not
> > > > > refcounted so they will literally go from under MAC1. Not sure how
> > > > > this can be dealt with?
> > > >
> > > > unbinding is not a normal operation. So i would just live with it, and
> > > > if root decides to shoot herself in the foot, that is her choice.
> > > >
> > > 
> > > I disagree. Unbinding is very much a normal operation.
> 
> What do you use it for?
> 
> I don't think i've ever manually done it. Maybe as part of a script to
> unbind the FTDI driver from an FTDI device in order to use user space
> tools to program the EEPROM? But that is about it.
> 
> I actually expect many unbind operations are broken because it is very
> rarely used.

rmmod! Particularly useful during driver development, I tend to use it
extensively - and it has the advantage of testing those unbind paths!

-- 
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