linux-kernel - Re: [PATCH] x86: check for valid irq_cfg pointer in smp_irq_move_cleanup

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Message-ID: <alpine.LFD.2.02.1205232107120.3231@ionos>
Date:	Wed, 23 May 2012 21:24:12 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dimitri Sivanich <sivanich@....com>
cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	x86@...nel.org, Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Naga Chumbalkar <nagananda.chumbalkar@...com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: check for valid irq_cfg pointer in
 smp_irq_move_cleanup_interrupt

On Wed, 23 May 2012, Dimitri Sivanich wrote:

> On Wed, May 23, 2012 at 01:16:36PM -0500, Dimitri Sivanich wrote:
> > In create_irq_nr() there is a window where we have set vector_irq in
> > __assign_irq_vector(), but not yet called irq_set_chip_data() to set the
> > irq_cfg pointer.
> 
> BTW - is there a reason why we're calling irq_set_chip_data() in create_irq_nr()
> rather than in __assign_irq_vector() for the case where irq_cfg is NULL?

We can't nest desc->lock inside vector lock.
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