linux-kernel - RE: [PATCH] Subject: Prevent acpi_run_osc from using NULL objects (was: Re: Oops in ACPI with git latest)

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Date:	Fri, 24 Oct 2008 16:27:05 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	"Moore, Robert" <robert.moore@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] Subject: Prevent acpi_run_osc from using NULL objects
 (was: Re: Oops in ACPI with git latest)



> We've just recently deployed a new module that validates the inputs and outputs
> for the predefined ACPI methods (Those that start with underscore).
> 
> That is the source of these messages:
> 
> > > ACPI Warning (nspredef-0252): \_SB_.PCI0._OSC: Parameter count mismatch - ASL declared 5, expected 4 [20080926]
> > > ACPI Error (nspredef-0163): \_SB_.PCI0._OSC: Missing expected return value [20080926]
> 
> For the initial version of this module, we only output messages when the inputs and/or
> outputs don't match the requirements of the ACPI specification. 
> 
> We can change this to returning exceptions in the future.

I expect we're going to have a bunch of false positives with this one,
and indeed may need to even pare the warnings back to only
when CONFIG_ACPI_DEBUG, or acpi=strict or something.

-Len
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