From: Jens Axboe <jens.axboe@oracle.com>
Date:   Tue Sep 16 09:54:11 2008 -0700
Subject: use rq complete marking in blk_abort_request()
Git: 7ba1fbaa4a478f72fbaf5a56af9c82a77966b4c7
References: bnc#434105

We cannot abort a request if we raced with the timeout handler already,
or with the IO completion. So make blk_abort_request() mark the request
as complete, and only continue if we succeeded.
    
Found and suggested by Mike Anderson <andmike@linux.vnet.ibm.com>
    
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>

---
 block/blk-timeout.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/block/blk-timeout.c
+++ b/block/blk-timeout.c
@@ -99,6 +99,8 @@ void blk_rq_timed_out_timer(unsigned lon
  */
 void blk_abort_request(struct request *req)
 {
+	if (blk_mark_rq_complete(req))
+		return;
 	blk_delete_timer(req);
 	blk_rq_timed_out(req);
 }