linux-kernel - Re: [PATCH 1/3] ACPI / dock: Rework the handling of notifications

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Date:	Fri, 28 Jun 2013 16:34:21 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <liuj97@...il.com>,
	"Alexander E. Patrakov" <patrakov@...il.com>
Subject: Re: [PATCH 1/3] ACPI / dock: Rework the handling of notifications

On Fri, Jun 28, 2013 at 3:53 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.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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