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SubjectRe: [PATCH] 2.4.22-pre7 : ACPI poweroff fix

Andrew,

What is your opinion on this patch?

On Wed, 23 Jul 2003, Willy Tarreau wrote:

> Hi Marcelo,
>
> [ this is a resend, there has been a delivery failure at conectiva. If
> you want, I can forward you the copy from the mailer daemon ]
>
> here are those fixes again. I have received a second report that it
> fixed the ACPI poweroff bug (this time, for <cijoml@volny.cz>).
> IIRC, when you unroll the code, it's obviously buggy because a
> function (of which I don't remember the name, it's 3 months old) is
> called explicitely for state=S5, but avoids this value within the
> tests !
>
> Please apply it, or ask Andrew for some feedback. It seems as if he
> doesn't receive my emails, I've sent him these patches 2 or 3 times
> since, including one on the acpi-devel list, but never got any
> feedback (or I had no luck and mailed him during his hollidays) :-(
>
> Unfortunately, I have not kept the original mail containing my
> analysis of the problem at this time.
>
> Thanks in advance,
> Willy
>
> ----- Forwarded message from Willy Tarreau <willy@w.ods.org> -----
>
> Date: Thu, 10 Jul 2003 09:58:50 +0200
> From: Willy Tarreau <willy@w.ods.org>
> To: Aschwin Marsman <a.marsman@aYniK.com>
> Cc: Marcelo Tosatti <marcelo@conectiva.com.br>,
> lkml <linux-kernel@vger.kernel.org>
> Subject: Re: Linux 2.4.22-pre4
> In-Reply-To: <Pine.LNX.4.44.0307100717570.18695-100000@localhost.localdomain>
> User-Agent: Mutt/1.4i
> Precedence: bulk
> X-Mailing-List: linux-kernel@vger.kernel.org
>
> Hi !
>
> On Thu, Jul 10, 2003 at 07:23:32AM +0200, Aschwin Marsman wrote:
> > On Wed, 9 Jul 2003, Marcelo Tosatti wrote:
> >
> > > Hi,
> > >
> > > Here goes -pre4. It contains a lot of updates and fixes.
> > >
> > > We decided to include this new code quota code which allows usage of
> > > quotas with 32bit UID/GIDs.
> > >
> > > Most Toshibas should work now due to an important ACPI fix.
> > >
> > > Please help and test.
> >
> > I use -pre3 with succes, only power down is currently not working
> > (only the discs shutdown, no real poweroff). That's why I disabled
> > apm and enabled apm in the kernel with -pre4, but that gives:
>
> I remember having had problems with ACPI because my power off didn't work.
> After reading through the code, I noticed that due to erroneous comparisons,
> some code path would never be executed, and/or some preparatory work before
> entering S5 would be done twice, or could not recover from error, I don't
> recall exactly. So I sent the two patches below to the acpi-devel list twice,
> but never got any reply.
>
> I don't even know if they still apply, but you can try them anyway, they're
> simple.
>
> If I recall correctly, the first one should be enough to poweroff with a simple
> "echo 5 > /proc/acpi/sleep", while the second one allows the system to use this
> for poweroff.
>
> Cheers,
> Willy
>
>
> --- ./drivers/acpi/system.c-orig Tue Apr 29 17:39:34 2003
> +++ ./drivers/acpi/system.c Tue Apr 29 19:08:09 2003
> @@ -180,7 +180,7 @@
> return AE_ERROR;
> }
>
> - if (state < ACPI_STATE_S5) {
> + if (state <= ACPI_STATE_S5) {
> /* Tell devices to stop I/O and actually save their state.
> * It is theoretically possible that something could fail,
> * so handle that gracefully..
> @@ -277,6 +277,7 @@
>
> switch (state) {
> case ACPI_STATE_S1:
> + case ACPI_STATE_S5:
> barrier();
> status = acpi_enter_sleep_state(state);
> break;
>
>
>
> --- ./drivers/acpi/system.c-orig Tue Apr 29 19:09:19 2003
> +++ ./drivers/acpi/system.c Tue Apr 29 19:36:08 2003
> @@ -90,9 +90,7 @@
> static void
> acpi_power_off (void)
> {
> - acpi_enter_sleep_state_prep(ACPI_STATE_S5);
> - ACPI_DISABLE_IRQS();
> - acpi_enter_sleep_state(ACPI_STATE_S5);
> + acpi_suspend(ACPI_STATE_S5);
> }
>
> #endif /*CONFIG_PM*/
>
>
>
>
-
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