From: Arjan van de Ven <arjan@linux.intel.com>
Date: Thu, 8 Jan 2009 20:35:11 +0000 (-0800)
Subject: async: make async_synchronize_full() more serializing
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=33b04b9308959af7febc1c111c766fa3fd8b1934;p=deliverable%2Flinux.git

async: make async_synchronize_full() more serializing

turns out that there are real problems with allowing async
tasks that are scheduled from async tasks to run after
the async_synchronize_full() returns.

This patch makes the _full more strict and a complete
synchronization. Later I might need to add back a lighter
form of synchronization for other uses.. but not right now.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/async.c b/kernel/async.c
index 97373380c9e7..64cc916299a5 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -206,7 +206,9 @@ EXPORT_SYMBOL_GPL(async_schedule_special);
 
 void async_synchronize_full(void)
 {
-	async_synchronize_cookie(next_cookie);
+	do {
+		async_synchronize_cookie(next_cookie);
+	} while (!list_empty(&async_running) || !list_empty(&async_pending));
 }
 EXPORT_SYMBOL_GPL(async_synchronize_full);