Re: [Fastboot] Fw: Problems with reboot/poweroff on SMP machine

[Andrew Morton <akpm-3NddpPZAyC0@public.gmane.org>]

(Added acpi people)

ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman) wrote:
>
> ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman) writes:
> 
> > Martin MOKREJ___ <mmokrejs-FKSC99mem8wheYDy1lqhK0JFmxxWawaa@public.gmane.org> writes:
> >
> >> Hi Eric,
> >>   I don't know if I was epxected to test this right away, but
> >> I just tried over acpi patched sources on my i686:
> >
> > Thanks.  That is my bug. 
> >
> > I knew the code wasn't quite right but I missed how off it
> > was :)
> >
> > Just remove the BUG_ON(!shutdown_prepared) line and it should
> > compile.  I don't know why I though I could read a static
> > variable in another function...
> 
> I am now officially confused.  My patch might clean up a corner
> case or two but it really should not help, because the issue
> I was worried about is mostly fixed.
> 
> All of the pieces are there for the acpi power off case to work
> correctly so is beginning to look like a completely different bug
> then what I am suspecting.  Anyone who can testing of my patch
> would be a help.
> 
> The only other interesting data point I can think of at the moment
> is the attached patch below.  
> 
> I want to know if acpi_power_off is having problems because interrupts
> get disabled.

I have a vague feeling that adding local_irq_disable() to acpi_power_off()
is illegal.

void acpi_power_off(void)
{
	printk("%s called\n", __FUNCTION__);
	local_irq_disable();
	acpi_enter_sleep_state(ACPI_STATE_S5);
}

Can an ACPI person please comment?

> Eric
> 
> diff --git a/arch/i386/kernel/i8259.c b/arch/i386/kernel/i8259.c
> --- a/arch/i386/kernel/i8259.c
> +++ b/arch/i386/kernel/i8259.c
> @@ -283,7 +283,7 @@ static struct sysdev_class i8259_sysdev_
>         set_kset_name("i8259"),
>         .suspend = i8259A_suspend,
>         .resume = i8259A_resume,
> -       .shutdown = i8259A_shutdown,
> +//     .shutdown = i8259A_shutdown,
>  };
> 
>  static struct sys_device device_i8259A = {


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