diff options
| author | James Bottomley <James.Bottomley@suse.de> | 2011-05-18 16:20:10 +0200 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2012-02-11 15:38:37 +0100 |
| commit | 636121a6617fc1a59549b9ad665cd5f61ded5261 (patch) | |
| tree | 5c76d0e9c220c281e763a909635f1e372ab7bca8 | |
| parent | 3870ae183ae5b0eee768fd0daa07047e751403eb (diff) | |
block: add proper state guards to __elv_next_request
commit 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae upstream.
blk_cleanup_queue() calls elevator_exit() and after this, we can't
touch the elevator without oopsing. __elv_next_request() must check
for this state because in the refcounted queue model, we can still
call it after blk_cleanup_queue() has been called.
This was reported as causing an oops attributable to scsi.
[WT: in 2.6.27, __elv_next_request() is in elevator.c]
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | block/elevator.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/elevator.c b/block/elevator.c index ed6f8f32d27..3e37ca822d8 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -729,7 +729,8 @@ static inline struct request *__elv_next_request(struct request_queue *q) return rq; } - if (!q->elevator->ops->elevator_dispatch_fn(q, 0)) + if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags) || + !q->elevator->ops->elevator_dispatch_fn(q, 0)) return NULL; } } |