linux-kernel - Re: [PATCH] net/wireless/libertas: do not call wiphy_unregister() w/o wiphy

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Message-ID: <20100330085253.GL30801@buzzloop.caiaq.de>
Date:	Tue, 30 Mar 2010 10:52:53 +0200
From:	Daniel Mack <daniel@...aq.de>
To:	Holger Schurig <hs4233@...l.mn-solutions.de>
Cc:	linux-kernel@...r.kernel.org, Dan Williams <dcbw@...hat.com>,
	"John W. Linville" <linville@...driver.com>,
	Bing Zhao <bzhao@...vell.com>,
	libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net/wireless/libertas: do not call wiphy_unregister()
 w/o wiphy_register()

On Tue, Mar 30, 2010 at 08:49:07AM +0200, Holger Schurig wrote:
> > The libertas driver calls wiphy_unregister() without a prior
> > wiphy_register() when a devices fails initialization. Fix this by
> > introducing a private flag.
> 
> Nice.
> 
> However, I wonder: do we really need a private variable?  Does each driver 
> introduce a private variable for this?

I didn't check other drivers thoroughly. I just saw the comment on the
function which does the wiphy allocation and considered libertas to be
special in the way it deals with the wireless core:

/*
 * At this time lbs_private *priv doesn't even exist, so we just allocate
 * memory and don't initialize the wiphy further. This is postponed until we
 * can talk to the firmware and happens at registration time in
 * lbs_cfg_wiphy_register().
 */

And as I didn't find any function to tell me whether a wiphy has been
registered and not just allocated, I saw no other way than manually
track what the libertas driver does.

If there's any better solution, I'd happily test it.

Thanks,
Daniel

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