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-rw-r--r--block/blk-sysfs.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 9272452ff456d..4a6a40ffd78e7 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -921,6 +921,7 @@ unlock:
mutex_unlock(&q->sysfs_lock);
return ret;
}
+EXPORT_SYMBOL_GPL(blk_register_queue);
void blk_unregister_queue(struct gendisk *disk)
{
@@ -929,6 +930,10 @@ void blk_unregister_queue(struct gendisk *disk)
if (WARN_ON(!q))
return;
+ /* Return early if disk->queue was never registered. */
+ if (!test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags))
+ return;
+
/*
* Protect against the 'queue' kobj being accessed
* while/after it is removed.