diff options
Diffstat (limited to 'drivers/acpi/executer/exconfig.c')
| -rw-r--r-- | drivers/acpi/executer/exconfig.c | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/drivers/acpi/executer/exconfig.c b/drivers/acpi/executer/exconfig.c index 009aef5fcbf..8cc410ce920 100644 --- a/drivers/acpi/executer/exconfig.c +++ b/drivers/acpi/executer/exconfig.c @@ -285,16 +285,16 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc, switch (ACPI_GET_OBJECT_TYPE(obj_desc)) { case ACPI_TYPE_REGION: + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n", + obj_desc, + acpi_ut_get_object_type_name(obj_desc))); + /* Region must be system_memory (from ACPI spec) */ if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) { return_ACPI_STATUS(AE_AML_OPERAND_TYPE); } - ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n", - obj_desc, - acpi_ut_get_object_type_name(obj_desc))); - /* * If the Region Address and Length have not been previously evaluated, * evaluate them now and save the results. @@ -306,6 +306,11 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc, } } + /* + * We will simply map the memory region for the table. However, the + * memory region is technically not guaranteed to remain stable and + * we may eventually have to copy the table to a local buffer. + */ table_desc.address = obj_desc->region.address; table_desc.length = obj_desc->region.length; table_desc.flags = ACPI_TABLE_ORIGIN_MAPPED; @@ -313,18 +318,23 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc, case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */ - /* Simply extract the buffer from the buffer object */ - ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Buffer or Field %p %s\n", obj_desc, acpi_ut_get_object_type_name(obj_desc))); - table_desc.pointer = ACPI_CAST_PTR(struct acpi_table_header, - obj_desc->buffer.pointer); - table_desc.length = table_desc.pointer->length; - table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED; + /* + * We need to copy the buffer since the original buffer could be + * changed or deleted in the future + */ + table_desc.pointer = ACPI_ALLOCATE(obj_desc->buffer.length); + if (!table_desc.pointer) { + return_ACPI_STATUS(AE_NO_MEMORY); + } - obj_desc->buffer.pointer = NULL; + ACPI_MEMCPY(table_desc.pointer, obj_desc->buffer.pointer, + obj_desc->buffer.length); + table_desc.length = obj_desc->buffer.length; + table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED; break; default: @@ -369,6 +379,9 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc, cleanup: if (ACPI_FAILURE(status)) { + + /* Delete allocated buffer or mapping */ + acpi_tb_delete_table(&table_desc); } return_ACPI_STATUS(status); |