linux-kernel - Re: ISA -> ISA_ (Re: [GIT PATCH] ACPI patches for 2.6.25-rc6)

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Message-Id: <200803261247.31531.bjorn.helgaas@hp.com>
Date:	Wed, 26 Mar 2008 12:47:29 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Alexey Starikovskiy <aystarik@...il.com>
Cc:	Len Brown <lenb@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Corentin CHARY <corentincj@...aif.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org
Subject: Re: ISA -> ISA_ (Re: [GIT PATCH] ACPI patches for 2.6.25-rc6)

On Wednesday 26 March 2008 11:24:41 am Alexey Starikovskiy wrote:
> Bjorn Helgaas wrote:
> > I'm curious about how this works.  I disassembled the DSDT from
> > http://bugzilla.kernel.org/show_bug.cgi?id=4773 (I attached the disassembly
> > at http://bugzilla.kernel.org/attachment.cgi?id=15448&action=view), and
> > the _PRT contains "_SB" and "ISA" (no trailing underscores):
> >
> >                 Package (0x04)
> >                 {
> >                     0x000DFFFF, 
> >                     0x00, 
> >                     \_SB.PCI0.ISA.LNKA, 
> >                     0x00
> >                 }
> >
> > But by the time we get to acpi_pci_irq_add_entry(), we've added the
> > underscores somewhere (see
> > http://bugzilla.kernel.org/attachment.cgi?id=15423&action=view):
> >
> >   0000:00:0d[A] -> \_SB_.PCI0.ISA_.LNKA
> >
> > I don't know where this happens, but it certainly confused me, and
> > it seems like it could lead to other bugs.
> >   
> ACPI is supposed to add trailing underscore for pad all names to 4 bytes.
> So ISA will be padded to ISA_.

The questions are "where does this happen?" and "why does it not
apply to other things like asus_acpi.c?"
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