ACPI boot fix for 2.6.15

[Andi Kleen <ak-l3A5Bk7waGM@public.gmane.org>]

Hallo,

I have the following patch in my x86-64 tree because it was needed
to boot without acpi=off on several of the machines here. 
Without it the ACPI device setup code would always create a loop
in the ACPI device tree and eventually some other code walking
it would hang the machine.

The patch has been around for a long time - it was originally 
done by Thomas Renninger - and has even been shipped in SUSE 10.0
so it was well tested
(which was 2.6.13 based, there the problem only hit occasionally,
in 2.6.14+ it seems to happen more frequently for some reason)

I think it was queued in the ACPI trees too and acked by the
ACPI poeople.

I know Len skipped the ACPI update for .15 for some reason,
but could we perhaps merge this safe patch. It would help
my test machines at least :)

----

From: trenn-l3A5Bk7waGM@public.gmane.org

Avoid endless loops in ACPI device tree.

Cc: Len.Brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org

Signed-off-by: Andi Kleen <ak-l3A5Bk7waGM@public.gmane.org>

Index: linux/drivers/acpi/scan.c
===================================================================
--- linux.orig/drivers/acpi/scan.c
+++ linux/drivers/acpi/scan.c
@@ -1110,7 +1110,7 @@ acpi_add_single_object(struct acpi_devic
 	 *
 	 * TBD: Assumes LDM provides driver hot-plug capability.
 	 */
-	result = acpi_bus_find_driver(device);
+	acpi_bus_find_driver(device);
 
       end:
 	if (!result)



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