linux-kernel - Re: scheduling while atomic acpi_idle_enter

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Date:	Mon, 2 Nov 2009 19:09:30 -0800
From:	"Luis R. Rodriguez" <mcgrof@...il.com>
To:	Len Brown <lenb@...nel.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: scheduling while atomic acpi_idle_enter_bm

On Mon, Nov 2, 2009 at 7:02 PM, Len Brown <lenb@...nel.org> wrote:
>> > I get this when modprobing some module I am working on. I figured it
>> > was the module's fault but the EIP points to something else so I am
>> > not sure. I get the following repeating about 4 times on 2.6.32-rc5:
>>
>>
>> you can get this if your own code leaves interrupts disabled in a
>> kernel thread and then lets the cpu go idle...
>
> Unclear.
>
> acpi_enter_idle_bm() assumes that it is entered with irqs enabled,
> and so it we unconditionally disables IRQs.
>
> Then we unconditionally re-enable them.
>
> The problem seems to be that right after we enable them,
> we find that they are actually disabled, perhaps as
> a side-effect of SMM.
>
> Is your machine a Dell, per chance?

Nope.

> Please test the patches in this bug report:
> http://bugzilla.kernel.org/show_bug.cgi?id=14101

In my case it was as Arjan pointed out and I've fixed it in my driver.
Sorry for not reporting back and thanks for your review.

  Luis
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