From: Jens Axboe <jens.axboe@oracle.com>
Date: Tue, 29 Jan 2008 21:25:18 +0000 (+0100)
Subject: as-iosched: fix double locking bug in as_merged_requests()
X-Git-Tag: v2.6.25-rc1~1147
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=149a051f82d2b3860fe32fa182dbc83a66274894;p=linux-2.6

as-iosched: fix double locking bug in as_merged_requests()

If the two requests belong to the same io context, we will attempt
to lock the same lock twice. But swapping contexts is pointless in
that case, so just check for rioc == nioc before doing the double
lock and copy.

Tested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/block/as-iosched.c b/block/as-iosched.c
index b201d16a71..96036846a0 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -1275,9 +1275,13 @@ static void as_merged_requests(struct request_queue *q, struct request *req,
 			 * Don't copy here but swap, because when anext is
 			 * removed below, it must contain the unused context
 			 */
-			double_spin_lock(&rioc->lock, &nioc->lock, rioc < nioc);
-			swap_io_context(&rioc, &nioc);
-			double_spin_unlock(&rioc->lock, &nioc->lock, rioc < nioc);
+			if (rioc != nioc) {
+				double_spin_lock(&rioc->lock, &nioc->lock,
+								rioc < nioc);
+				swap_io_context(&rioc, &nioc);
+				double_spin_unlock(&rioc->lock, &nioc->lock,
+								rioc < nioc);
+			}
 		}
 	}