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authorJens Axboe <jaxboe@fusionio.com>2011-04-21 19:28:35 +0200
committerJens Axboe <jaxboe@fusionio.com>2011-04-21 19:28:35 +0200
commit3aa72873ffdcc2f7919743efbbefc351ec73f5cb (patch)
treef159c777a489c6ac3721ba1f1cadbe2d86b19fa5
parent584f79046780e10cb24367a691f8c28398a00e84 (diff)
downloadop-kernel-dev-3aa72873ffdcc2f7919743efbbefc351ec73f5cb.zip
op-kernel-dev-3aa72873ffdcc2f7919743efbbefc351ec73f5cb.tar.gz
elevator: check for ELEVATOR_INSERT_SORT_MERGE in !elvpriv case too
The sort insert is the one that goes to the IO scheduler. With the SORT_MERGE addition, we could bypass IO scheduler setup but still ask the IO scheduler to insert the request. This would cause an oops on switching IO schedulers through the sysfs interface, unless the disk just happened to be idle while it occured. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
-rw-r--r--block/elevator.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 6f6abc0..45ca1e3 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -671,7 +671,8 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where)
q->boundary_rq = rq;
}
} else if (!(rq->cmd_flags & REQ_ELVPRIV) &&
- where == ELEVATOR_INSERT_SORT)
+ (where == ELEVATOR_INSERT_SORT ||
+ where == ELEVATOR_INSERT_SORT_MERGE))
where = ELEVATOR_INSERT_BACK;
switch (where) {
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