Subject: Re: [PATCH] MSI: check for BIOS assigned addresses
From: Daniel Yeisley <dan.yeisley@unisys.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Yinghai Lu <yinghai@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
       Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org,
       akpm@linux-foundation.org
In-Reply-To: <20090306162402.GA8936@elte.hu>
References: <1236352309.31604.2.camel@localhost.localdomain>
	 <20090306162402.GA8936@elte.hu>
Content-Type: text/plain
Date: Fri, 06 Mar 2009 10:56:49 -0500
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ACPI hotplug doesn't work.

Dan


On Fri, 2009-03-06 at 17:24 +0100, Ingo Molnar wrote:
> * Daniel Yeisley <dan.yeisley@unisys.com> wrote:
> 
> > When creating MSI addresses the kernel makes them up and 
> > writes them to the hardware without first checking for what 
> > the system BIOS may have assigned.  The patch below checks for 
> > already assigned values, and leaves them alone if they exist.
> > 
> > Signed-off-by: Dan Yeisley <dan.yeisley@unisys.com>
> 
> What happens without this fix - do you get non-working cards? 
> Boot hang? Or a suboptimal layout?
> 
> 	Ingo

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