linux-kernel - Re: acpi_evaluate_integer broken by design

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Message-ID: <20081127135845.GB6104@atrey.karlin.mff.cuni.cz>
Date:	Thu, 27 Nov 2008 14:58:45 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: acpi_evaluate_integer broken by design

Hi!

> > > Len, this looks like 2.6.28 material.  But given the poor quality of
> > > the changelog it is hard to be sure about this.  Why isn't everyone
> > > seeing these warnings?  What did Pavel do to provoke these alleged
> > > warnings?  Nobody knows...
> > 
> > I don't know know why pavel sees this and nobody else --
> > maybe something unusual he's doing with suspend?

No, playing with driver for HP LED.

Now... I guess the test confused me. Because it tests for
irqs_disabled(), I assumed it was okay to call from interrupt context,
but now I'm not sure at all. Can you help? Comment would be nice.

> If we really do need to inspect global state to handle this, it would
> be much better to create a new
> 
> bool resume_is_running_so_you_cant_sleep;
> 
> and to test that.  Something which is clear, highly specific and which
> cannot be accidentally triggered via other means.

Works for me.
									Pavel

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