linux-kernel - Re: [PATCH] ACPI: don't attempt to use hest_tab unless !acpi_pci

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Date:	Sat, 15 Jan 2011 14:01:18 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Huang Ying <ying.huang@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] ACPI: don't attempt to use hest_tab unless !acpi_pci_disabled

On Saturday, January 15, 2011, Andres Salomon wrote:
> On Fri, 14 Jan 2011 23:24:27 -0500 (EST)
> Len Brown <lenb@...nel.org> wrote:
> 
> [...]
> > > This patch causes apei_hest_parse to check both hest_disabled and
> > > acpi_pci_disabled before continuing.  With it, the XO-1 boots
> > > properly.
> > 
> > The X0-1 has no ACPI support, and thus you are running
> > with acpi_disabled=1, yes?
> 
> The XO-1 has no ACPI support, but ACPI support is enabled in the kernel
> (as the XO-1.5 does have ACPI support, and the same kernel is used
> between both) and I'm not passing any arguments to the kernel regarding
> it. The kernel's ACPI code detects that it's not there and disables it
> (the kernel message that's seen is "ACPI: Interpreter disabled.")
> 
> This is what sets apci_pci_disabled to 1; I'm not doing it manually.

Hmm.  Does the appended patch help instead?

Rafael

---
 drivers/acpi/pci_root.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6/drivers/acpi/pci_root.c
===================================================================
--- linux-2.6.orig/drivers/acpi/pci_root.c
+++ linux-2.6/drivers/acpi/pci_root.c
@@ -631,11 +631,11 @@ static int acpi_pci_root_remove(struct a
 
 static int __init acpi_pci_root_init(void)
 {
+	acpi_hest_init();
+
 	if (acpi_pci_disabled)
 		return 0;
 
-	acpi_hest_init();
-
 	pci_acpi_crs_quirks();
 	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
 		return -ENODEV;
--
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