linux-kernel - Re: x86: fix race in create_irq_nr on irq

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Message-ID: <4B694DEF.70301@kernel.org>
Date:	Wed, 03 Feb 2010 02:20:31 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Brandon Philips <bphilips@...e.de>
CC:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	YinghaiLu@...e.de, Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: x86: fix race in create_irq_nr on irq_desc

On 02/02/2010 07:31 PM, Brandon Philips wrote:
> Race in create_irq_nr():
> 
> - Thread 1 loops through and calls irq_to_desc_alloc_node with new=0x66.
> 
> - Thread 2 has exited the loop with irq=0x66 and calls dynamic_irq_init(0x66)
>   setting desc->chip_data = NULL
> 
> - Thread 1 then dereferences NULL via desc_new->chip_data->vector

two threads get same irq?

YH
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