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@ -112,6 +112,8 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
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union acpi_operand_object *region_obj2;
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void *region_context = NULL;
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struct acpi_connection_info *context;
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acpi_mutex context_mutex;
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u8 context_locked;
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acpi_physical_address address;
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ACPI_FUNCTION_TRACE(ev_address_space_dispatch);
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@ -136,6 +138,8 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
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}
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context = handler_desc->address_space.context;
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context_mutex = handler_desc->address_space.context_mutex;
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context_locked = FALSE;
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/*
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* It may be the case that the region has never been initialized.
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@ -204,41 +208,6 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
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handler = handler_desc->address_space.handler;
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address = (region_obj->region.address + region_offset);
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/*
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* Special handling for generic_serial_bus and general_purpose_io:
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* There are three extra parameters that must be passed to the
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* handler via the context:
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* 1) Connection buffer, a resource template from Connection() op
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* 2) Length of the above buffer
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* 3) Actual access length from the access_as() op
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*
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* In addition, for general_purpose_io, the Address and bit_width fields
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* are defined as follows:
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* 1) Address is the pin number index of the field (bit offset from
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* the previous Connection)
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* 2) bit_width is the actual bit length of the field (number of pins)
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*/
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if ((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS) &&
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context && field_obj) {
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/* Get the Connection (resource_template) buffer */
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context->connection = field_obj->field.resource_buffer;
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context->length = field_obj->field.resource_length;
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context->access_length = field_obj->field.access_length;
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}
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if ((region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) &&
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context && field_obj) {
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/* Get the Connection (resource_template) buffer */
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context->connection = field_obj->field.resource_buffer;
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context->length = field_obj->field.resource_length;
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context->access_length = field_obj->field.access_length;
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address = field_obj->field.pin_number_index;
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bit_width = field_obj->field.bit_length;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
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®ion_obj->region.handler->address_space, handler,
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@ -256,11 +225,58 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
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acpi_ex_exit_interpreter();
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}
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/*
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* Special handling for generic_serial_bus and general_purpose_io:
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* There are three extra parameters that must be passed to the
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* handler via the context:
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* 1) Connection buffer, a resource template from Connection() op
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* 2) Length of the above buffer
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* 3) Actual access length from the access_as() op
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*
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* Since we pass these extra parameters via the context, which is
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* shared between threads, we must lock the context to avoid these
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* parameters being changed from another thread before the handler
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* has completed running.
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*
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* In addition, for general_purpose_io, the Address and bit_width fields
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* are defined as follows:
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* 1) Address is the pin number index of the field (bit offset from
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* the previous Connection)
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* 2) bit_width is the actual bit length of the field (number of pins)
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*/
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if ((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS ||
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region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) &&
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context && field_obj) {
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status =
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acpi_os_acquire_mutex(context_mutex, ACPI_WAIT_FOREVER);
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if (ACPI_FAILURE(status)) {
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goto re_enter_interpreter;
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}
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context_locked = TRUE;
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/* Get the Connection (resource_template) buffer */
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context->connection = field_obj->field.resource_buffer;
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context->length = field_obj->field.resource_length;
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context->access_length = field_obj->field.access_length;
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if (region_obj->region.space_id == ACPI_ADR_SPACE_GPIO) {
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address = field_obj->field.pin_number_index;
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bit_width = field_obj->field.bit_length;
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}
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}
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/* Call the handler */
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status = handler(function, address, bit_width, value, context,
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region_obj2->extra.region_context);
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if (context_locked) {
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acpi_os_release_mutex(context_mutex);
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}
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]",
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acpi_ut_get_region_name(region_obj->region.
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@ -277,6 +293,7 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
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}
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}
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re_enter_interpreter:
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if (!(handler_desc->address_space.handler_flags &
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ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
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/*
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