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ACPICA: Remove possibility of executing _REG methods twice

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If a custom address space handler is installed by the host
before the "initialize operation regions" phase of the ACPICA
initialization, any _REG methods for that address space could
be executed twice. This change fixes the problem.
ACPICA BZ 427.

http://www.acpica.org/bugzilla/show_bug.cgi?id=427

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lin Ming 2009-10-13 10:29:30 +08:00 committed by Len Brown
parent 0240d7b4f2
commit 74d3ec77a5
1 changed files with 59 additions and 5 deletions
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60
drivers/acpi/acpica/evregion.c
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@ -51,6 +51,10 @@
ACPI_MODULE_NAME("evregion")
/* Local prototypes */
static u8
acpi_ev_has_default_handler(struct acpi_namespace_node *node,
acpi_adr_space_type space_id);
static acpi_status
acpi_ev_reg_run(acpi_handle obj_handle,
u32 level, void *context, void **return_value);
@ -140,6 +144,50 @@ acpi_status acpi_ev_install_region_handlers(void)
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_has_default_handler
*
* PARAMETERS: Node - Namespace node for the device
* space_id - The address space ID
*
* RETURN: TRUE if default handler is installed, FALSE otherwise
*
* DESCRIPTION: Check if the default handler is installed for the requested
* space ID.
*
******************************************************************************/
static u8
acpi_ev_has_default_handler(struct acpi_namespace_node *node,
acpi_adr_space_type space_id)
{
union acpi_operand_object *obj_desc;
union acpi_operand_object *handler_obj;
/* Must have an existing internal object */
obj_desc = acpi_ns_get_attached_object(node);
if (obj_desc) {
handler_obj = obj_desc->device.handler;
/* Walk the linked list of handlers for this object */
while (handler_obj) {
if (handler_obj->address_space.space_id == space_id) {
if (handler_obj->address_space.handler_flags &
ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
return (TRUE);
}
}
handler_obj = handler_obj->address_space.next;
}
}
return (FALSE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_initialize_op_regions
@ -169,13 +217,19 @@ acpi_status acpi_ev_initialize_op_regions(void)
for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
/*
* TBD: Make sure handler is the DEFAULT handler, otherwise
* _REG will have already been run.
* Make sure the installed handler is the DEFAULT handler. If not the
* default, the _REG methods will have already been run (when the
* handler was installed)
*/
status = acpi_ev_execute_reg_methods(acpi_gbl_root_node,
if (acpi_ev_has_default_handler(acpi_gbl_root_node,
acpi_gbl_default_address_spaces
[i])) {
status =
acpi_ev_execute_reg_methods(acpi_gbl_root_node,
acpi_gbl_default_address_spaces
[i]);
}
}
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_ACPI_STATUS(status);