linux-kernel - Re: [PATCH 1/7] phy: fix of_mdio_find

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Message-Id: <20150921.120159.326170798236851436.davem@davemloft.net>
Date:	Mon, 21 Sep 2015 12:01:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rmk+kernel@....linux.org.uk
Cc:	f.fainelli@...il.com, devicetree@...r.kernel.org,
	frowand.list@...il.com, grant.likely@...aro.org,
	isubramanian@....com, kchudgar@....com,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, leoli@...escale.com,
	michal.simek@...inx.com, netdev@...r.kernel.org, rric@...nel.org,
	robh+dt@...nel.org, soren.brinkmann@...inx.com,
	sgoutham@...ium.com, thomas.petazzoni@...e-electrons.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] phy: fix of_mdio_find_bus() device refcount leak

From: Russell King <rmk+kernel@....linux.org.uk>
Date: Fri, 18 Sep 2015 10:54:55 +0100

> Update the comment, and arrange for the only user of this function
> to drop this refcount when disposing of a reference to it.

mdio_mux is not the only user of of_mdio_find_bus(), DSA uses it as
well.

So if anything this commit message is inaccurate.

I also wonder about this refcounting scheme.

If you are going to drop the inner device reference, then we take the
mdio bus returned from of_mdio_find_bus() what holds onto it and keeps
it from disappearing on us?

Don't we have to hold onto some reference count of some kind here?
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