netdev - Re: [PATCHES] Networking fixes for -stable.

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Date:	Wed, 14 Nov 2012 16:34:56 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Peter Senna Tschudin <peter.senna@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCHES] Networking fixes for -stable.

On Wed, 2012-11-14 at 15:02 +0100, Peter Senna Tschudin wrote:
> Hi Ben,
> 
> On Tue, Nov 13, 2012 at 8:51 PM, Ben Hutchings <ben@...adent.org.uk> wrote:
> > On Mon, 2012-11-12 at 00:25 -0500, David Miller wrote:
> >> Please queue up the following networking bug fixes for
> >> 3.0.x, 3.2.x, 3.4.x, and 3.6.x, respectively.
> > [...]
> >> From 2204849a85383fbde75680aa199142abe504adbb Mon Sep 17 00:00:00 2001
> >> From: Peter Senna Tschudin <peter.senna@...il.com>
> >> Date: Sun, 28 Oct 2012 06:12:01 +0000
> >> Subject: [PATCH 7/9] drivers/net/phy/mdio-bitbang.c: Call mdiobus_unregister
> >>  before mdiobus_free
> >>
> >> [ Upstream commit aa731872f7d33dcb8b54dad0cfb82d4e4d195d7e ]
> >>
> >> Based on commit b27393aecf66199f5ddad37c302d3e0cfadbe6c0
> >>
> >> Calling mdiobus_free without calling mdiobus_unregister causes
> >> BUG_ON(). This patch fixes the issue.
> > [...]
> >
> > This introduces a regresssion, as mdiobus_unregister() is not safe to
> > call if the bus isn't registered.  Registration is controlled by the
> > drivers that use mdio-bitbang, and they should take care of
> > unregistration too - and most of them do.
> 
> Is mdiobus_free() safe to call if the bus isn't registered?
[...]

It must be, otherwise what do you do if mdiobus_register() fails?

Ben.

-- 
Ben Hutchings
friends: People who know you well, but like you anyway.

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