linux-kernel - Re: [patch] sgi-xp: nested calls to spin_lock

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Message-ID: <20111216115500.GD2547@sgi.com>
Date:	Fri, 16 Dec 2011 05:55:00 -0600
From:	Robin Holt <holt@....com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Robin Holt <holt@....com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] sgi-xp: nested calls to spin_lock_irqsave()

On Thu, Dec 15, 2011 at 09:48:05AM +0300, Dan Carpenter wrote:
> The code here has a nested spin_lock_irqsave().  It's not needed since
> IRQs are already disabled and it causes a problem because it means that
> IRQs won't be enabled again at the end.  The second call to
> spin_lock_irqsave() will overwrite the value of irq_flags and we can't
> restore the proper settings.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Acked-by: Robin Holt <holt@....com>
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