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Commit c5b18e22 authored by Toshi Kani's avatar Toshi Kani Committed by Rafael J. Wysocki
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ACPI: Add ACPI CPU hot-remove support 



Added support of CPU hot-remove via an ACPI eject notification.
It calls acpi_bus_hot_remove_device(), which shares the same code
path with the sysfs eject operation.  acpi_os_hotplug_execute()
runs the hot-remove operation in kacpi_hotplug_wq and serializes
it between ACPI hot-remove and sysfs eject requests.

Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
Reviewed-by: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Tested-by: default avatarIgorMammedov <imammedo@redhat.com>
Tested-by: default avatarVijay Mohan Pandarathil <vijaymohan.pandarathil@hp.com>
Tested-by: default avatarPrarit Bhargava <prarit@redhat.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 61622acc

drivers/acpi/processor_driver.c

+17 −10
Original line number Diff line number Diff line
@@ -695,8 +695,8 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 
static void acpi_processor_hotplug_notify(acpi_handle handle,

					  u32 event, void *data)

{

	struct acpi_processor *pr;

	struct acpi_device *device = NULL;

	struct acpi_eject_event *ej_event = NULL;

	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */

	int result;
@@ -728,20 +728,27 @@ static void acpi_processor_hotplug_notify(acpi_handle handle, 
				  "received ACPI_NOTIFY_EJECT_REQUEST\n"));



		if (acpi_bus_get_device(handle, &device)) {

			printk(KERN_ERR PREFIX

				    "Device don't exist, dropping EJECT\n");

			pr_err(PREFIX "Device don't exist, dropping EJECT\n");

			break;

		}

		pr = acpi_driver_data(device);

		if (!pr) {

			printk(KERN_ERR PREFIX

				    "Driver data is NULL, dropping EJECT\n");

		if (!acpi_driver_data(device)) {

			pr_err(PREFIX "Driver data is NULL, dropping EJECT\n");

			break;

		}



		/* REVISIT: update when eject is supported */

		ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;

		ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);

		if (!ej_event) {

			pr_err(PREFIX "No memory, dropping EJECT\n");

			break;

		}



		ej_event->handle = handle;

		ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;

		acpi_os_hotplug_execute(acpi_bus_hot_remove_device,

					(void *)ej_event);



		/* eject is performed asynchronously */

		return;



	default:

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,