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ACPI / PAD: don't register acpi_pad driver if running as Xen dom0

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When running as Xen dom0 a special processor_aggregator driver is
needed.  Don't register the standard driver in this case.

Without that check an error message:

"Error: Driver 'processor_aggregator' is already registered,
aborting..."

will be displayed.

Signed-off-by: Juergen Gross <jgross@suse.com>
[ rjw: Minor fixups ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Juergen Gross 2016-10-12 13:11:45 +02:00 committed by Rafael J. Wysocki
parent c8d2bc9bc3
commit e311404f79
1 changed files with 5 additions and 0 deletions
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5
drivers/acpi/acpi_pad.c
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@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/acpi.h>
#include <asm/mwait.h>
#include <xen/xen.h>
#define ACPI_PROCESSOR_AGGREGATOR_CLASS "acpi_pad"
#define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
@ -477,6 +478,10 @@ static struct acpi_driver acpi_pad_driver = {
static int __init acpi_pad_init(void)
{
/* Xen ACPI PAD is used when running as Xen Dom0. */
if (xen_initial_domain())
return -ENODEV;
power_saving_mwait_init();
if (power_saving_mwait_eax == 0)
return -EINVAL;