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-rw-r--r--block/cfq-iosched.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 1f96ad6254f1..650834537606 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1209,6 +1209,9 @@ static void cfq_destroy_cfqg(struct cfq_data *cfqd, struct cfq_group *cfqg)
hlist_del_init(&cfqg->cfqd_node);
+ BUG_ON(cfqd->nr_blkcg_linked_grps <= 0);
+ cfqd->nr_blkcg_linked_grps--;
+
/*
* Put the reference taken at the time of creation so that when all
* queues are gone, group can be destroyed.