Re: [PATCH 4/4] fastboot: make ACPI bus drivers probe asynchronous

Arjan van de Ven
2009-01-05T01:58:30Z

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
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