Messages in this thread | | | Date | Fri, 28 Jun 2013 16:34:21 -0700 | Subject | Re: [PATCH 1/3] ACPI / dock: Rework the handling of notifications | From | Yinghai Lu <> |
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On Fri, Jun 28, 2013 at 3:53 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > The ACPI dock driver uses register_acpi_bus_notifier() which > installs a notifier triggered globally for all system notifications. > That first of all is inefficient, because the dock driver is only > interested in notifications associated with the devices it handles, > but it has to handle all system notifies for all devices. Moreover, > it does that even if no docking stations are present in the system > (CONFIG_ACPI_DOCK set is sufficient for that to happen). Besides, > that is inconvenient, because it requires the driver to do extra work > for each notification to find the target dock station object. > > For these reasons, rework the dock driver to install a notify > handler individually for each dock station in the system using > acpi_install_notify_handler(). This allows the dock station > object to be passed directly to the notify handler and makes it > possible to simplify the dock driver quite a bit. It also > reduces the overhead related to the handling of all system > notifies when CONFIG_ACPI_DOCK is set.
original change to use register_acpi_bus_notifier, have two assumption 1. two dock_station will have same handle. 2. acpi subsystem: non root acpi device only can have one system notifier installed.
Maybe you can rework acpi_install_notify_handler to fix 2.
Thanks
Yinghai
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