1 files changed, 5 insertions, 8 deletions

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 81e970adeab3..b0d4b147b19e 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -129,11 +129,15 @@ acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
         struct acpi_memory_info *info, *n;
 
 
+        if (!list_empty(&mem_device->res_list))
+                return 0;
+
         status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
                                      acpi_memory_get_resource, mem_device);
         if (ACPI_FAILURE(status)) {
                 list_for_each_entry_safe(info, n, &mem_device->res_list, list)
                         kfree(info);
+                INIT_LIST_HEAD(&mem_device->res_list);
                 return -EINVAL;
         }
 
@@ -230,17 +234,10 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
          * (i.e. memory-hot-remove function)
          */
         list_for_each_entry(info, &mem_device->res_list, list) {
-                u64 start_pfn, end_pfn;
-
-                start_pfn = info->start_addr >> PAGE_SHIFT;
-                end_pfn = (info->start_addr + info->length - 1) >> PAGE_SHIFT;
-
-                if (pfn_valid(start_pfn) || pfn_valid(end_pfn)) {
-                        /* already enabled. try next area */
+                if (info->enabled) { /* just sanity check...*/
                         num_enabled++;
                         continue;
                 }
-
                 result = add_memory(node, info->start_addr, info->length);
                 if (result)
                         continue;