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authorRafael J. Wysocki <rjw@sisk.pl>2010-02-18 01:42:59 +0300
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-02-23 03:20:56 +0300
commit3f0be67188c60ebf1b5d00354b44b4b24f5af313 (patch)
treee785e4cd32fc6ea96ecd1cb14c9cd235efbdf4c5 /drivers/acpi/acpica/evmisc.c
parentf517709d65beed95f52f021b43e3035b52ef791a (diff)
downloadlinux-3f0be67188c60ebf1b5d00354b44b4b24f5af313.tar.xz
ACPI / ACPICA: Multiple system notify handlers per device
Currently it only is possible to install one system notify handler per namespace node, but this is not enough for PCI run-time power management, because we need to install power management notifiers for devices that already have hotplug notifiers installed. While in principle this could be handled at the PCI level, that would be suboptimal due to the way in which the ACPI-based PCI hotplug code is designed. For this reason, modify ACPICA so that it is possible to install more than one system notify handler per namespace node. Namely, make acpi_install_notify_handler(), acpi_remove_notify_handler() and acpi_ev_notify_dispatch() use a list of system notify handler objects associated with a namespace node. Make acpi_remove_notify_handler() call acpi_os_wait_events_complete() upfront to avoid a situation in which concurrent instance of acpi_remove_notify_handler() removes the handler from under us while we're waiting for the event queues to flush. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/acpi/acpica/evmisc.c')
-rw-r--r--drivers/acpi/acpica/evmisc.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/evmisc.c b/drivers/acpi/acpica/evmisc.c
index ce224e1eaa89..8f0fac6c4366 100644
--- a/drivers/acpi/acpica/evmisc.c
+++ b/drivers/acpi/acpica/evmisc.c
@@ -259,9 +259,15 @@ static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
handler_obj = notify_info->notify.handler_obj;
if (handler_obj) {
- handler_obj->notify.handler(notify_info->notify.node,
- notify_info->notify.value,
- handler_obj->notify.context);
+ struct acpi_object_notify_handler *notifier;
+
+ notifier = &handler_obj->notify;
+ while (notifier) {
+ notifier->handler(notify_info->notify.node,
+ notify_info->notify.value,
+ notifier->context);
+ notifier = notifier->next;
+ }
}
/* All done with the info object */