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

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Date:	Wed, 26 Mar 2008 20:24:41 +0300
From:	Alexey Starikovskiy <aystarik@...il.com>
To:	Bjorn Helgaas <bjorn.helgaas@...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)

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_.

Regards,
Alex.
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