netdev - Re: [PATCH v3 0/9] Phy, mdiobus, and netdev struct device fixes

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Message-ID: <20150924215731.GE20825@lunn.ch>
Date:	Thu, 24 Sep 2015 23:57:31 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	David Miller <davem@...emloft.net>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	devicetree@...r.kernel.org, Sunil Goutham <sgoutham@...ium.com>,
	Robert Richter <rric@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Michal Simek <michal.simek@...inx.com>, netdev@...r.kernel.org,
	Soren Brinkmann <soren.brinkmann@...inx.com>,
	Iyappan Subramanian <isubramanian@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Li Yang <leoli@...escale.com>,
	Keyur Chudgar <kchudgar@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/9] Phy, mdiobus, and netdev struct device fixes

...

> While looking at the DSA code, I noticed we have a
> of_find_net_device_by_node(), and it looks like users of that are
> similarly buggy - it looks like net/dsa/dsa.c is the only user.  Fix
> that too.

...
 
> The mdiobus code also suffered from the same kind of leak, but thankfully
> this only happened in one place - the mdio-mux code.

Hi Russell

I tested both of these with my board. It is a Freescale Vybrid, using
the FEC ethernet driver, and i have three switches attached, using
mdio-mux to give three mdio busses.

No obvious regressions, my board boots, the switches are all present
and correct. I built the FEC driver as a module, and it won't unload:

 kernel:unregister_netdevice: waiting for eth1 to become free. Usage count = 1
unregister_netdevice: waiting for eth1 to become free. Usage count = 1

i assume because DSA holds a reference. I've not tried a fully module
build, DSA has issues with that.

Tested-by: Andrew Lunn <andrew@...n.ch>

Thanks
	Andrew
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