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

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>

1 files changed, 24 insertions, 7 deletions

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 1e90e8f01007..736ec047e0fc 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -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;