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-rw-r--r--block/blk-core.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index f65871116404..f43c8a5840ae 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -407,8 +407,13 @@ void blk_cleanup_queue(struct request_queue *q)
spin_unlock_irq(lock);
mutex_unlock(&q->sysfs_lock);
- /* drain all requests queued before DEAD marking */
- blk_drain_queue(q, true);
+ /*
+ * Drain all requests queued before DEAD marking. The caller might
+ * be trying to tear down @q before its elevator is initialized, in
+ * which case we don't want to call into draining.
+ */
+ if (q->elevator)
+ blk_drain_queue(q, true);
/* @q won't process any more request, flush async actions */
del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer);