[PATCH] blk: unplug later

get_request_wait needn't unplug the device immediately.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/block/ll_rw_blk.c

@@ -1969,7 +1969,6 @@ static struct request *get_request_wait(request_queue_t *q, int rw)
 	DEFINE_WAIT(wait);
 	struct request *rq;
 
-	generic_unplug_device(q);
 	do {
 		struct request_list *rl = &q->rq;
 
@@ -1981,6 +1980,7 @@ static struct request *get_request_wait(request_queue_t *q, int rw)
 		if (!rq) {
 			struct io_context *ioc;
 
+			generic_unplug_device(q);
 			io_schedule();
 
 			/*