From: Bjorn Helgaas <bjorn.helgaas@hp.com>
Date: Thu, 25 Mar 2010 15:28:30 +0000 (-0600)
Subject: x86/PCI: truncate _CRS windows with _LEN > _MAX - _MIN + 1
X-Git-Tag: v2.6.34-rc3~18^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d558b483d5a73f5718705b270cb2090f66ea48c8;p=pandora-kernel.git

x86/PCI: truncate _CRS windows with _LEN > _MAX - _MIN + 1

Yanko's GA-MA78GM-S2H (BIOS F11) reports the following resource in a PCI
host bridge _CRS:

    [07] 32-Bit DWORD Address Space Resource
         Min Relocatability : MinFixed
         Max Relocatability : MaxFixed
            Address Minimum : CFF00000  (_MIN)
            Address Maximum : FEBFFFFF  (_MAX)
             Address Length : 3EE10000  (_LEN)

This is invalid per spec (ACPI 4.0, 6.4.3.5) because it's a fixed size,
fixed location descriptor, but _LEN != _MAX - _MIN + 1.

Based on https://bugzilla.kernel.org/show_bug.cgi?id=15480#c15, I think
Windows handles this by truncating the window so it fits between _MIN and
_MAX.  I also verified this by modifying the SeaBIOS DSDT and booting
Windows 2008 R2 with qemu.

This patch makes Linux truncate the window, too, which fixes:
    http://bugzilla.kernel.org/show_bug.cgi?id=15480

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Tested-by: Yanko Kaneti <yaneti@declera.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---

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