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>

diff --git a/block/elevator.c b/block/elevator.c
index 6f6abc08bb565e61d63294e1a14f66ac6cda6a3d..45ca1e34f58249ff5b3838c0ec89fbc1c6ea2bb7 100644 (file)
--- 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) {