linux-kernel - Re: [PATCH] x86: reget cfg_new in case reuse/move irq

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Date:	Sat, 8 Aug 2009 17:02:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: reget cfg_new in case reuse/move irq_desc


* Yinghai Lu <yinghai@...nel.org> wrote:

> when irq_desc is moved, we need to make sure to use right cfg_new
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  arch/x86/kernel/apic/io_apic.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
> +++ linux-2.6/arch/x86/kernel/apic/io_apic.c
> @@ -3153,6 +3153,7 @@ unsigned int create_irq_nr(unsigned int
>  			continue;
>  
>  		desc_new = move_irq_desc(desc_new, node);
> +		cfg_new = desc_new->chip_data;
>  

i suspect we need this for .31? Did you see any actual bug due to 
this? (if yes, how did it look like?)

	Ingo
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