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>

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);
 }

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);
 }
 
 /*******************************************************************************