Date: Wed, 25 Mar 2009 18:24:41 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: Nate Lawson <nate@root.org> Cc: freebsd-acpi@FreeBSD.org Subject: Re: shutdown via power button: "acpi: resumed at..." Message-ID: <49CA5AC9.1040601@icyb.net.ua> In-Reply-To: <49CA57E2.7090805@root.org> References: <49C8E143.2080305@icyb.net.ua> <49CA57E2.7090805@root.org>
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on 25/03/2009 18:12 Nate Lawson said the following:
> Andriy Gapon wrote:
>> I noticed that sometimes I am getting "acpi: resumed at..." message on console and
>> in system log when I initiate system shutdown by pressing power button.
>> I think that the cause is in acpi_UserNotify("Resume") call and this call is only
>> found in acpi_EnterSleepState().
>>
>> I see the following code in that function:
>> case ACPI_STATE_S5:
>> /*
>> * Shut down cleanly and power off. This will call us back through the
>> * shutdown handlers.
>> */
>> shutdown_nice(RB_POWEROFF);
>> break;
>>
>> So it seems that it is expected that shutdown_nice() would return immediately.
>> I think it makes S5 a special case comparing to other states where return happens
>> upon resuming from the state.
>> In this case, maybe it is not necessary for S5 request to go through the
>> resume/wakeup half of acpi_EnterSleepState.
>>
>
> I thought shutdown*() should never return at all. It sounds like
> interrupts are being re-enabled or something.
>
No, this is a different kind of shutdown, this one just send a signal to init:
void
shutdown_nice(int howto)
{
shutdown_howto = howto;
/* Send a signal to init(8) and have it shutdown the world */
if (initproc != NULL) {
PROC_LOCK(initproc);
psignal(initproc, SIGINT);
PROC_UNLOCK(initproc);
} else {
/* No init(8) running, so simply reboot */
boot(RB_NOSYNC);
}
return;
}
--
Andriy Gapon
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