linux-kernel - Re: [PATCH] lockdep: annotate irda warning

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Date:	Fri, 24 Nov 2006 22:14:29 +0200
From:	Samuel Ortiz <samuel@...tiz.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrey Borzenkov <arvidjaar@...l.ru>,
	Andrew Morton <akpm@...l.org>,
	irda-users@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, arjan <arjan@...radead.org>,
	John Platt <jplatt39@...il.com>
Subject: Re: [PATCH] lockdep: annotate irda warning

Hi guys,

On Mon, Nov 20, 2006 at 10:15:39AM +0100, Peter Zijlstra wrote:
>
> So, under the assumption the author was right, it just needs a lockdep
> annotation.
> 
> (depends on patches in -mm for spin_lock_irqsave_nested())
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  net/irda/irlmp.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6-mm/net/irda/irlmp.c
> ===================================================================
> --- linux-2.6-mm.orig/net/irda/irlmp.c	2006-11-20 09:54:50.000000000 +0100
> +++ linux-2.6-mm/net/irda/irlmp.c	2006-11-20 10:12:11.000000000 +0100
> @@ -1678,7 +1678,8 @@ static int irlmp_slsap_inuse(__u8 slsap_
>  	 *  every IrLAP connection and check every LSAP associated with each
>  	 *  the connection.
>  	 */
> -	spin_lock_irqsave(&irlmp->links->hb_spinlock, flags);
> +	spin_lock_irqsave_nested(&irlmp->links->hb_spinlock, flags,
> +			SINGLE_DEPTH_NESTING);
>  	lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
>  	while (lap != NULL) {
>  		IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, goto errlap;);

This patch got pushed into mainline, while the spin_lock_irq_save_nested()
patches are not there yet. It breaks IrDA as irlmp.c doesn't build.
Linus, could you please revert the corresponding commit
(700f9672c9a61c12334651a94d17ec04620e1976) unless you are planning to pull
the spin_lock_irq_save_nested() patches soon from -mm ?
Thanks a lot in advance.

Cheers,
Samuel.
-
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