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ACPI / ACPICA: Avoid crashing if _PRW is defined for the root object

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Some ACPI BIOSes define _PRW for the root object which causes
acpi_setup_gpe_for_wake() to crash when trying to dereference the
bogus device_node pointer.  Avoid the crash by checking if
wake_device is not the root object before attempting to set up the
"implicit notify" mechanism for it.

The problem was introduced by commit bba63a296f
(ACPICA: Implicit notify support) that added the wake_device argument
to acpi_setup_gpe_for_wake().

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2011-02-12 01:39:15 +01:00
parent 100b33c8bd
commit 2d55951368
1 changed files with 27 additions and 24 deletions
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29
drivers/acpi/acpica/evxfgpe.c
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@ -212,37 +212,40 @@ acpi_setup_gpe_for_wake(acpi_handle wake_device,
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Validate wake_device is of type Device */
device_node = ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
if (device_node->type != ACPI_TYPE_DEVICE) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
/* Ensure that we have a valid GPE number */
gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
if (gpe_event_info) {
if (!gpe_event_info) {
goto unlock_and_exit;
}
/*
* If there is no method or handler for this GPE, then the
* wake_device will be notified whenever this GPE fires (aka
* "implicit notify") Note: The GPE is assumed to be
* level-triggered (for windows compatibility).
*/
if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
ACPI_GPE_DISPATCH_NONE) {
gpe_event_info->flags =
(ACPI_GPE_DISPATCH_NOTIFY |
if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
ACPI_GPE_DISPATCH_NONE) && (wake_device != ACPI_ROOT_OBJECT)) {
/* Validate wake_device is of type Device */
device_node = ACPI_CAST_PTR(struct acpi_namespace_node,
wake_device);
if (device_node->type != ACPI_TYPE_DEVICE) {
goto unlock_and_exit;
}
gpe_event_info->flags = (ACPI_GPE_DISPATCH_NOTIFY |
ACPI_GPE_LEVEL_TRIGGERED);
gpe_event_info->dispatch.device_node = device_node;
}
gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
status = AE_OK;
}
unlock_and_exit:
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return_ACPI_STATUS(status);
}