linux-kernel - Re: [RFC] [PATCH] Fix misrouted interrupts deadlocks

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Message-Id: <1163167950.1980.4.camel@earth>
Date:	Fri, 10 Nov 2006 15:12:30 +0100
From:	Ingo Molnar <mingo@...hat.com>
To:	Pavel Emelianov <xemul@...nvz.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mingo@...e.hu, Kirill Korotaev <dev@...nvz.org>
Subject: Re: [RFC] [PATCH] Fix misrouted interrupts deadlocks

On Fri, 2006-11-10 at 16:55 +0300, Pavel Emelianov wrote:
> -                       int ok = misrouted_irq(irq);
> +                       int ok;
> +
> +                       spin_unlock(&desc->lock);
> +                       ok = misrouted_irq(irq);
> +                       spin_lock(&desc->lock); 

your fix looks reasonable to me - it's a thinko to call misrouted_irq()
with the descriptor lock still held. (btw., how did you find it -
lockdep spinlock debugging or NMI watchdog?)

Acked-by: Ingo Molnar <mingo@...hat.com>

	Ingo

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