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| author | James Bottomley <James.Bottomley@suse.de> | 2011-05-18 16:20:10 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-05-18 19:30:32 +0200 |
| commit | 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae (patch) | |
| tree | eb1b325d28c0aa44b1dba3bdb0b31b662b2a1f7f /block/blk.h | |
| parent | a2b9c1f6208126e6df6c02428c501f8853685812 (diff) | |
| download | lwn-0a58e077eb600d1efd7e54ad9926a75a39d7f8ae.tar.gz lwn-0a58e077eb600d1efd7e54ad9926a75a39d7f8ae.zip | |
block: add proper state guards to __elv_next_request
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.
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk.h')
| -rw-r--r-- | block/blk.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk.h b/block/blk.h index 61263463e38e..4df474d37e6d 100644 --- a/block/blk.h +++ b/block/blk.h @@ -62,7 +62,8 @@ 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; } } |