linux-kernel - Re: [PATCH] MSI: check for BIOS assigned addresses

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Message-Id: <1236355009.31604.3.camel@localhost.localdomain>
Date:	Fri, 06 Mar 2009 10:56:49 -0500
From:	Daniel Yeisley <dan.yeisley@...sys.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Yinghai Lu <yinghai@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] MSI: check for BIOS assigned addresses

ACPI hotplug doesn't work.

Dan


On Fri, 2009-03-06 at 17:24 +0100, Ingo Molnar wrote:
> * Daniel Yeisley <dan.yeisley@...sys.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@...sys.com>
> 
> What happens without this fix - do you get non-working cards? 
> Boot hang? Or a suboptimal layout?
> 
> 	Ingo

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