From b23530ebc339c4092ae2c9f37341a5398fea8b89 Mon Sep 17 00:00:00 2001
From: Ming Lei <tom.leiming@gmail.com>
Date: Sat, 21 Feb 2009 16:45:07 +0800
Subject: driver core: remove polling for driver_probe_done(v5)

This patch removes 100ms polling for driver_probe_done in
wait_for_device_probe(), and uses wait_event() instead.
Removing polling in fs initialization may lead to
a faster boot.

This patch also changes the return type of wait_for_device_done()
from int to void.

This patch is against Arjan's patch in linux-next tree.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 3f32df7..0dfd08c 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -172,16 +172,12 @@ int driver_probe_done(void)
 /**
  * wait_for_device_probe
  * Wait for device probing to be completed.
- *
- * Note: this function polls at 100 msec intervals.
  */
-int wait_for_device_probe(void)
+void wait_for_device_probe(void)
 {
 	/* wait for the known devices to complete their probing */
-	while (driver_probe_done() != 0)
-		msleep(100);
+	wait_event(probe_waitqueue, atomic_read(&probe_count) == 0);
 	async_synchronize_full();
-	return 0;
 }
 
 /**
diff --git a/include/linux/device.h b/include/linux/device.h
index d5706c4..c56b154 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -147,7 +147,7 @@ extern void put_driver(struct device_driver *drv);
 extern struct device_driver *driver_find(const char *name,
 					 struct bus_type *bus);
 extern int driver_probe_done(void);
-extern int wait_for_device_probe(void);
+extern void wait_for_device_probe(void);
 
 
 /* sysfs interface for exporting driver attributes */
-- 
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