linux-kernel - Re: [PATCH] intel-agp.c: Fix crash when accessing nonexistent GTT entries in i915

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Date:	Tue, 27 Apr 2010 13:26:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:	Christian Kujau <lists@...dbynature.de>,
	Zhenyu Wang <zhenyuw@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, David.Woodhouse@...el.com,
	dwmw2@...radead.org, eric@...olt.net, ben@...adent.org.uk,
	gregkh@...e.de, Dave Airlie <airlied@...ux.ie>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: Re: [PATCH] intel-agp.c: Fix crash when accessing nonexistent GTT 
 entries in i915

On Tue, 27 Apr 2010 22:06:21 +0200
Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote:

> On Tue, Apr 27, 2010 at 7:57 PM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> > On Thu, 25 Mar 2010 17:55:56 +0100
> > Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote:
> >
> >> On Wed, Mar 24, 2010 at 7:14 PM, Andrew Morton
> >> <akpm@...ux-foundation.org> wrote:
> >> > On Tue, 23 Mar 2010 12:40:05 +0100
> >> > Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote:
> >> >
> >> >> On Tue, Mar 23, 2010 at 5:14 AM, Christian Kujau <lists@...dbynature.de> wrote:
> >> >> > On Mon, 22 Mar 2010 at 20:57, Andrew Morton wrote:
> >> >> >> On Sun, 21 Mar 2010 16:30:20 +0100 Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote:
> >> >> >> > I bisected in order to find the commit 5877960869333e42ebeb733e8d9d5630ff96d350.
> >> >> >
> >> >> > I believe this[0] is fc61901373987ad61851ed001fe971f3ee8d96a3 upstream:
> >> >>
> >> >> Indeed. Also in
> >> >>
> >> >> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.32.y.git;a=commit;h=fc61901373987ad61851ed001fe971f3ee8d96a3
> >> >
> >> > Does reverting that patch from the current code fix the crash?
> >>
> >> Yes. In addition, applying the patch I provided also fixes it in current code.
> >>
> >
> > Well great. __A whole pile of new stuff has turned up in linux-next's
> > drivers/char/agp/intel-agp.c. __As far as I can tell none of it
> > address the regression which you've reported and your patch no longer
> > applies at all so I have to drop the patch.
> >
> > Perhaps "agp/intel: put back check that we have a driver for the
> > bridge" fixes it, but it isn't tagged for -stable backporting.
> 
> I can try linux-next and see if it works again.

Thanks.

> In addition, I have to test the regression with some newer X version
> yet, as Zhenyu told me.

That would seem to be counter-productive.  If you install a newer X and
the bug goes away, you've just gone and made it harder for yourself to
reproduce the bug.

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