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    SubjectRe: [PATCH 4/4] fastboot: make ACPI bus drivers probe asynchronous
    On Mon, 05 Jan 2009 10:03:12 +0800
    Zhao Yakui <yakui.zhao@intel.com> wrote:

    > On Sun, 2009-01-04 at 09:31 -0800, Arjan van de Ven wrote:
    > > From 20af3efd07b775a27a997e3df1039e20ea18f62b Mon Sep 17 00:00:00
    > > 2001 From: Arjan van de Ven <arjan@linux.intel.com>
    > > Date: Sun, 4 Jan 2009 05:32:28 -0800
    > > Subject: [PATCH] fastboot: make ACPI bus drivers probe asynchronous
    > >
    > > the various ACPI bus drivers have non-overlapping devices and can
    > > each be run asynchronous. Some of the ACPI drivers (especially the
    > > battery one, but others as well) can take quite a long time to
    > > probe.
    > It seems that all the ACPI drivers are registered asynchronously after
    > this change.

    they are registered asynchronously compared to the rest of the kernel,
    but in strict original sequence compared to eachother.


    > > +static void acpi_bus_register_async(void *data, async_cookie_t
    > > cookie) +{
    > > + int ret;
    > > + struct acpi_driver *driver = data;
    > > + driver->drv.name = driver->name;
    > > + driver->drv.bus = &acpi_bus_type;
    > > + driver->drv.owner = driver->owner;
    > > +
    > > + async_synchronize_cookie(cookie);
    > > +
    > > + ret = driver_register(&driver->drv);
    > > + WARN_ON(ret != 0);
    > > +}

    because of the async_synchronize_cookie() call!

    --
    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,
    visit http://www.lesswatts.org


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