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authorJames Bottomley <James.Bottomley@suse.de>2011-05-18 16:20:10 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-06-23 15:24:01 -0700
commit5e4c1dbf52bc1ff33782266332a62151d5b5f0be (patch)
treec29f79f3d421cb0b4e76b4ae3ffb472294eafd51 /block
parent5b2745db12a3f97a9ec9efd4ffa077da707d3e4c (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. 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>
Diffstat (limited to 'block')
-rw-r--r--block/blk.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk.h b/block/blk.h
index 5ee3d7e72feb..141483695145 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;
}
}