--- 2.4.23pre5/drivers/block/ll_rw_blk.c.~1~	2003-08-26 00:12:54.000000000 +0200
+++ 2.4.23pre5/drivers/block/ll_rw_blk.c	2003-10-02 09:54:56.000000000 +0200
@@ -658,6 +658,7 @@ static void get_request_wait_wakeup(requ
 	 * generic_unplug_device while our __get_request_wait was running
 	 * w/o the queue_lock held and w/ our request out of the queue.
 	 */	
+	smp_mb();
 	if (waitqueue_active(&q->wait_for_requests))
 		wake_up(&q->wait_for_requests);
 }