linux-kernel - Re: [PATCH][AGPGART] intel_agp: don't load if no IGD and AGP port

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Date:	Sat, 23 Jun 2007 09:52:03 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wang Zhenyu <zhenyu.z.wang@...el.com>
Cc:	davej@...hat.com, carlo@...noe.com, linux-kernel@...r.kernel.org,
	eric@...olt.net
Subject: Re: [PATCH][AGPGART] intel_agp: don't load if no IGD and AGP port

> On Thu, 21 Jun 2007 13:43:18 +0800 Wang Zhenyu <zhenyu.z.wang@...el.com> wrote:
> Thanks Carlo to report this problem. The following patch should fix
> his and potential issue.
> 
> [AGPGART] intel_agp: don't load if no IGD detected and no AGP port
> 
> After i915 chip, GMCH has no AGP port. Origin bridge driver in device
> table will try to access illegal regs like APBASE, APSIZE, etc. This
> may cause problem.
> 
> So mark them as NULL in the table, we won't load if no IGD got detect
> and bridge has no AGP port.

Looking at the above, I have no way of telling what the actual bug is, nor
have I any way of telling what the consequences would be of not having this
patch in 2.6.22.  Nor can I tell whether we want it in 2.6.21.x.

I probably _could_ work this out, and kinda did with a bit of list-trolling
(verdict: needed in 2.6.22) but please, take care to describe the
importance of a patch in the changelog?

Thanks.
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