ACPICA: Tables: Fix the issues in handling virtual addressed tables.

When table is overridden or reloaded, acpi_tb_delete_table() is called where
struct acpi_table_desc.Pointer will be NULL.  It thus is impossible for virtual
addressed tables to obtain the .Pointer again in acpi_tb_verify_table().

This patch stores virtual table addresses  (ACPI_TABLE_ORIGIN_ALLOCATED,
ACPI_TABLE_ORIGIN_UNKNOWN, ACPI_TABLE_ORIGIN_OVERRIDE) in the
struct acpi_table_desc.Address field and refills the struct acpi_table_desc.Pointer
using these addresses in acpi_tb_verify_table(). Note that if a table with
ACPI_TABLE_ORIGIN_ALLOCATED set is actually freed, the .Address field
should be invalidated and thus must be replaced with NULL to avoid wrong
future validations occuring in acpi_tb_verify_table().
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/exconfig.c

@@ -435,7 +435,7 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc,
 			return_ACPI_STATUS(status);
 		}
 
-		table_desc.address = obj_desc->region.address;
+		table_desc.address = ACPI_PTR_TO_PHYSADDR(table_desc.pointer);
 		break;
 
 	case ACPI_TYPE_BUFFER:	/* Buffer or resolved region_field */
@@ -476,7 +476,7 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc,
 		}
 
 		ACPI_MEMCPY(table_desc.pointer, table, length);
-		table_desc.address = ACPI_TO_INTEGER(table_desc.pointer);
+		table_desc.address = ACPI_PTR_TO_PHYSADDR(table_desc.pointer);
 		break;
 
 	default:

drivers/acpi/acpica/tbinstal.c

@@ -69,11 +69,26 @@ acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc)
 	/* Map the table if necessary */
 
 	if (!table_desc->pointer) {
-		if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
-		    ACPI_TABLE_ORIGIN_MAPPED) {
+		switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
+		case ACPI_TABLE_ORIGIN_MAPPED:
+
 			table_desc->pointer =
 			    acpi_os_map_memory(table_desc->address,
 					       table_desc->length);
+			break;
+
+		case ACPI_TABLE_ORIGIN_ALLOCATED:
+		case ACPI_TABLE_ORIGIN_UNKNOWN:
+		case ACPI_TABLE_ORIGIN_OVERRIDE:
+
+			table_desc->pointer =
+			    ACPI_CAST_PTR(struct acpi_table_header,
+					  table_desc->address);
+			break;
+
+		default:
+
+			break;
 		}
 
 		if (!table_desc->pointer) {
@@ -476,6 +491,7 @@ void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
 	case ACPI_TABLE_ORIGIN_ALLOCATED:
 
 		ACPI_FREE(table_desc->pointer);
+		table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
 		break;
 
 		/* Not mapped or allocated, there is nothing we can do */

drivers/acpi/acpica/tbutils.c

@@ -179,6 +179,7 @@ struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
 
 	ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length);
 	acpi_tb_delete_table(table_desc);
+	table_desc->address = ACPI_PTR_TO_PHYSADDR(new_table);
 	table_desc->pointer = new_table;
 	table_desc->flags = ACPI_TABLE_ORIGIN_ALLOCATED;