From akpm@linux-foundation.org  Tue Jun  2 11:59:34 2009
Date: Tue, 12 May 2009 13:37:57 -0700
From: Shaohua Li <shaohua.li@intel.com>
Subject: driver core: synchronize device shutdown
To: greg@kroah.com
Cc: akpm@linux-foundation.org, shaohua.li@intel.com, James.Bottomley@HansenPartnership.com, arjan@infradead.org, dtor@mail.ru
Message-ID: <200905122057.n4CKvDPk003386@imap1.linux-foundation.org>


From: Shaohua Li <shaohua.li@intel.com>

A patch series to make .shutdown execute asynchronously.  Some drivers's
shutdown can take a lot of time.  The patches can help save some shutdown
time.  The patches use Arjan's async API.


This patch:

synchronize all tasks submitted by .shutdown

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/base/core.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -22,6 +22,7 @@
 #include <linux/kallsyms.h>
 #include <linux/semaphore.h>
 #include <linux/mutex.h>
+#include <linux/async.h>
 
 #include "base.h"
 #include "power/power.h"
@@ -1665,4 +1666,5 @@ void device_shutdown(void)
 	kobject_put(sysfs_dev_char_kobj);
 	kobject_put(sysfs_dev_block_kobj);
 	kobject_put(dev_kobj);
+	async_synchronize_full();
 }