blk_cleanup_queue() should call bdi_unregister() only if WB_registered
is set to bdi->wb.state. Because, blk_cleanup_queue() may be called
before bdi_register() is called, for example, error path.

Signed-off-by: Masayoshi Mizuma <m.miz...@jp.fujitsu.com>
---
 block/blk-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 14d7c07..c1ab17e 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -595,7 +595,8 @@ void blk_cleanup_queue(struct request_queue *q)
                q->queue_lock = &q->__queue_lock;
        spin_unlock_irq(lock);
 
-       bdi_unregister(&q->backing_dev_info);
+       if (test_bit(WB_registered, &q->backing_dev_info.wb.state))
+               bdi_unregister(&q->backing_dev_info);
 
        /* @q is and will stay empty, shutdown and put */
        blk_put_queue(q);
-- 
1.8.3.1
--
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