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ACPI / memory-hotplug: add memory offline code to acpi_memory_device_remove()

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The memory device can be removed by 2 ways:
 1. send eject request by SCI
 2. echo 1 >/sys/bus/pci/devices/PNP0C80:XX/eject

In the 1st case, acpi_memory_disable_device() will be called.
In the 2nd case, acpi_memory_device_remove() will be called.
acpi_memory_device_remove() will also be called when we unbind the
memory device from the driver acpi_memhotplug or a driver initialization
fails.

acpi_memory_disable_device() has already implemented a code which
offlines memory and releases acpi_memory_info struct. But
acpi_memory_device_remove() has not implemented it yet.

So the patch move offlining memory and releasing acpi_memory_info struct
codes to a new function acpi_memory_remove_memory(). And it is used by both
acpi_memory_device_remove() and acpi_memory_disable_device().

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Yasuaki Ishimatsu 2012-11-15 06:59:31 +00:00 committed by Rafael J. Wysocki
parent 54c4c7db6c
commit 19387b27e4
1 changed files with 24 additions and 7 deletions
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31
drivers/acpi/acpi_memhotplug.c
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@ -306,25 +306,37 @@ static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device)
return 0;
}
static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
{
int result;
struct acpi_memory_info *info, *n;
/*
* Ask the VM to offline this memory range.
* Note: Assume that this function returns zero on success
*/
list_for_each_entry_safe(info, n, &mem_device->res_list, list) {
if (info->enabled) {
result = remove_memory(info->start_addr, info->length);
if (result)
return result;
}
list_del(&info->list);
kfree(info);
}
return 0;
}
static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
{
int result;
/*
* Ask the VM to offline this memory range.
* Note: Assume that this function returns zero on success
*/
result = acpi_memory_remove_memory(mem_device);
if (result)
return result;
/* Power-off and eject the device */
result = acpi_memory_powerdown_device(mem_device);
if (result) {
@ -474,12 +486,17 @@ static int acpi_memory_device_add(struct acpi_device *device)
static int acpi_memory_device_remove(struct acpi_device *device, int type)
{
struct acpi_memory_device *mem_device = NULL;
int result;
if (!device || !acpi_driver_data(device))
return -EINVAL;
mem_device = acpi_driver_data(device);
result = acpi_memory_remove_memory(mem_device);
if (result)
return result;
kfree(mem_device);
return 0;