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

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.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
---
drivers/acpi/scan.c | 23 ++++++++++++++++-------
1 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 39b7233..a9e542d 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -8,6 +8,7 @@
#include <linux/acpi.h>
#include <linux/signal.h>
#include <linux/kthread.h>
+#include <linux/async.h>

#include <acpi/acpi_drivers.h>
#include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */
@@ -578,6 +579,19 @@ static int acpi_start_single_object(struct acpi_device *device)
return result;
}

+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);
+}
/**
* acpi_bus_register_driver - register a driver with the ACPI bus
* @driver: driver being registered
@@ -588,16 +602,11 @@ static int acpi_start_single_object(struct acpi_device *device)
*/
int acpi_bus_register_driver(struct acpi_driver *driver)
{
- int ret;

if (acpi_disabled)
return -ENODEV;
- driver->drv.name = driver->name;
- driver->drv.bus = &acpi_bus_type;
- driver->drv.owner = driver->owner;
-
- ret = driver_register(&driver->drv);
- return ret;
+ async_schedule(acpi_bus_register_async, driver);
+ return 0;
}

EXPORT_SYMBOL(acpi_bus_register_driver);
--
1.6.0.6

--
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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