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

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Message-ID: <v2gca2dc2821004271407o59e3e2d4n135bb050510a2e63@mail.gmail.com>
Date:	Tue, 27 Apr 2010 23:07:39 +0200
From:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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, Apr 27, 2010 at 10:26 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> 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.
>

Oh, of course. I meant compiling the latest version somewhere and have
both versions ready (the Debian's one and the one from x.org).
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