ACPICA: Table Manager: Merge duplicate code (root table)

Merge/remove duplicate code in the root table resize functions
One function is external, the other is internal.  Lv Zheng,

ACPICA BZ 846:
https://acpica.org/bugzilla/show_bug.cgi?id=846

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 18 insertions, 43 deletions

diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c
index 74f97d74db1..70f9d787c82 100644
--- a/drivers/acpi/acpica/tbinstal.c
+++ b/drivers/acpi/acpica/tbinstal.c
@@ -350,6 +350,7 @@ struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header
 acpi_status acpi_tb_resize_root_table_list(void)
 {
         struct acpi_table_desc *tables;
+        u32 table_count;
 
         ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
 
@@ -363,8 +364,13 @@ acpi_status acpi_tb_resize_root_table_list(void)
 
         /* Increase the Table Array size */
 
-        tables = ACPI_ALLOCATE_ZEROED(((acpi_size) acpi_gbl_root_table_list.
-                                       max_table_count +
+        if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
+                table_count = acpi_gbl_root_table_list.max_table_count;
+        } else {
+                table_count = acpi_gbl_root_table_list.current_table_count;
+        }
+
+        tables = ACPI_ALLOCATE_ZEROED(((acpi_size) table_count +
                                        ACPI_ROOT_TABLE_SIZE_INCREMENT) *
                                       sizeof(struct acpi_table_desc));
         if (!tables) {
@@ -377,8 +383,8 @@ acpi_status acpi_tb_resize_root_table_list(void)
 
         if (acpi_gbl_root_table_list.tables) {
                 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
-                            (acpi_size) acpi_gbl_root_table_list.
-                            max_table_count * sizeof(struct acpi_table_desc));
+                            (acpi_size) table_count *
+                            sizeof(struct acpi_table_desc));
 
                 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
                         ACPI_FREE(acpi_gbl_root_table_list.tables);
@@ -386,9 +392,9 @@ acpi_status acpi_tb_resize_root_table_list(void)
         }
 
         acpi_gbl_root_table_list.tables = tables;
-        acpi_gbl_root_table_list.max_table_count +=
-            ACPI_ROOT_TABLE_SIZE_INCREMENT;
-        acpi_gbl_root_table_list.flags |= (u8)ACPI_ROOT_ORIGIN_ALLOCATED;
+        acpi_gbl_root_table_list.max_table_count =
+            table_count + ACPI_ROOT_TABLE_SIZE_INCREMENT;
+        acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
 
         return_ACPI_STATUS(AE_OK);
 }
diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
index 29e51bc0138..21101262e47 100644
--- a/drivers/acpi/acpica/tbxface.c
+++ b/drivers/acpi/acpica/tbxface.c
@@ -159,14 +159,12 @@ acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
  * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
  *              root list from the previously provided scratch area. Should
  *              be called once dynamic memory allocation is available in the
- *              kernel
+ *              kernel.
  *
  ******************************************************************************/
 acpi_status acpi_reallocate_root_table(void)
 {
-        struct acpi_table_desc *tables;
-        acpi_size new_size;
-        acpi_size current_size;
+        acpi_status status;
 
         ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
 
@@ -178,39 +176,10 @@ acpi_status acpi_reallocate_root_table(void)
                 return_ACPI_STATUS(AE_SUPPORT);
         }
 
-        /*
-         * Get the current size of the root table and add the default
-         * increment to create the new table size.
-         */
-        current_size = (acpi_size)
-            acpi_gbl_root_table_list.current_table_count *
-            sizeof(struct acpi_table_desc);
-
-        new_size = current_size +
-            (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc));
-
-        /* Create new array and copy the old array */
-
-        tables = ACPI_ALLOCATE_ZEROED(new_size);
-        if (!tables) {
-                return_ACPI_STATUS(AE_NO_MEMORY);
-        }
+        acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
 
-        ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size);
-
-        /*
-         * Update the root table descriptor. The new size will be the current
-         * number of tables plus the increment, independent of the reserved
-         * size of the original table list.
-         */
-        acpi_gbl_root_table_list.tables = tables;
-        acpi_gbl_root_table_list.max_table_count =
-            acpi_gbl_root_table_list.current_table_count +
-            ACPI_ROOT_TABLE_SIZE_INCREMENT;
-        acpi_gbl_root_table_list.flags =
-            ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
-
-        return_ACPI_STATUS(AE_OK);
+        status = acpi_tb_resize_root_table_list();
+        return_ACPI_STATUS(status);
 }
 
 /*******************************************************************************