1 files changed, 91 insertions, 3 deletions

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 5691f165a952..c5b4f1ed9b71 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -88,6 +88,7 @@ struct acpi_res_list {
         char name[5];   /* only can have a length of 4 chars, make use of this
                            one instead of res->name, no need to kalloc then */
         struct list_head resource_list;
+        int count;
 };
 
 static LIST_HEAD(resource_list_head);
@@ -1358,6 +1359,89 @@ acpi_os_validate_interface (char *interface)
         return AE_SUPPORT;
 }
 
+static inline int acpi_res_list_add(struct acpi_res_list *res)
+{
+        struct acpi_res_list *res_list_elem;
+
+        list_for_each_entry(res_list_elem, &resource_list_head,
+                            resource_list) {
+
+                if (res->resource_type == res_list_elem->resource_type &&
+                    res->start == res_list_elem->start &&
+                    res->end == res_list_elem->end) {
+
+                        /*
+                         * The Region(addr,len) already exist in the list,
+                         * just increase the count
+                         */
+
+                        res_list_elem->count++;
+                        return 0;
+                }
+        }
+
+        res->count = 1;
+        list_add(&res->resource_list, &resource_list_head);
+        return 1;
+}
+
+static inline void acpi_res_list_del(struct acpi_res_list *res)
+{
+        struct acpi_res_list *res_list_elem;
+
+        list_for_each_entry(res_list_elem, &resource_list_head,
+                            resource_list) {
+
+                if (res->resource_type == res_list_elem->resource_type &&
+                    res->start == res_list_elem->start &&
+                    res->end == res_list_elem->end) {
+
+                        /*
+                         * If the res count is decreased to 0,
+                         * remove and free it
+                         */
+
+                        if (--res_list_elem->count == 0) {
+                                list_del(&res_list_elem->resource_list);
+                                kfree(res_list_elem);
+                        }
+                        return;
+                }
+        }
+}
+
+acpi_status
+acpi_os_invalidate_address(
+    u8                   space_id,
+    acpi_physical_address   address,
+    acpi_size               length)
+{
+        struct acpi_res_list res;
+
+        switch (space_id) {
+        case ACPI_ADR_SPACE_SYSTEM_IO:
+        case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+                /* Only interference checks against SystemIO and SytemMemory
+                   are needed */
+                res.start = address;
+                res.end = address + length - 1;
+                res.resource_type = space_id;
+                spin_lock(&acpi_res_lock);
+                acpi_res_list_del(&res);
+                spin_unlock(&acpi_res_lock);
+                break;
+        case ACPI_ADR_SPACE_PCI_CONFIG:
+        case ACPI_ADR_SPACE_EC:
+        case ACPI_ADR_SPACE_SMBUS:
+        case ACPI_ADR_SPACE_CMOS:
+        case ACPI_ADR_SPACE_PCI_BAR_TARGET:
+        case ACPI_ADR_SPACE_DATA_TABLE:
+        case ACPI_ADR_SPACE_FIXED_HARDWARE:
+                break;
+        }
+        return AE_OK;
+}
+
 /******************************************************************************
  *
  * FUNCTION:    acpi_os_validate_address
@@ -1382,6 +1466,7 @@ acpi_os_validate_address (
     char *name)
 {
         struct acpi_res_list *res;
+        int added;
         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
                 return AE_OK;
 
@@ -1399,14 +1484,17 @@ acpi_os_validate_address (
                 res->end = address + length - 1;
                 res->resource_type = space_id;
                 spin_lock(&acpi_res_lock);
-                list_add(&res->resource_list, &resource_list_head);
+                added = acpi_res_list_add(res);
                 spin_unlock(&acpi_res_lock);
-                pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
-                         "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
+                pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
+                         "name: %s\n", added ? "Added" : "Already exist",
+                         (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
                          ? "SystemIO" : "System Memory",
                          (unsigned long long)res->start,
                          (unsigned long long)res->end,
                          res->name);
+                if (!added)
+                        kfree(res);
                 break;
         case ACPI_ADR_SPACE_PCI_CONFIG:
         case ACPI_ADR_SPACE_EC: