netdev - Re: [PATCH net-next 3/3] net: phy: bcm7xxx: request and manage GPHY clock

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Message-ID: <20200907190722.GA10378@pengutronix.de>
Date:   Mon, 7 Sep 2020 21:07:22 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, andrew@...n.ch, adam.rudzinski@....net.pl,
        hkallweit1@...il.com, richard.leitner@...data.com,
        zhengdejin5@...il.com, devicetree@...r.kernel.org,
        kernel@...gutronix.de, kuba@...nel.org, robh+dt@...nel.org
Subject: Re: [PATCH net-next 3/3] net: phy: bcm7xxx: request and manage GPHY
 clock

On 20-09-04 08:37, Florian Fainelli wrote:

...

> > Is this really necessary? The devm_clk_get_optional() function already
> > registers the devm_clk_release() hook.
> 
> Yes, because you can unbind the PHY driver from sysfs, and if you want to
> bind that driver again, which will call .probe() again, you must undo
> strictly everything that .probe() did. The embedded mdio_device does not go
> away, so there will be no automatic freeing of resources. Using devm_* may
> be confusing, so using just the plain clk_get() and clk_put() may be clearer
> here.

Hi Florian,

sorry for asking again... I'm getting a bit confused during applying
your comments to my smsc-phy patchset.
A few drivers are using the devm_kzalloc() (including your bcm7xxx.c and
my smsc.c). Does this mean that those drivers have a memory leak since
the mdio_device does not disappear and so the memory allocated during
probe() isn't freed?

Regards,
  Marco