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-rw-r--r--block/cfq-iosched.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 11ce6aaf1bd0..d582433441c5 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -879,6 +879,13 @@ static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd)
cfqq = list_entry_cfqq(cfqd->cur_rr.next);
/*
+ * If no new queues are available, check if the busy list has some
+ * before falling back to idle io.
+ */
+ if (!cfqq && !list_empty(&cfqd->busy_rr))
+ cfqq = list_entry_cfqq(cfqd->busy_rr.next);
+
+ /*
* if we have idle queues and no rt or be queues had pending
* requests, either allow immediate service if the grace period
* has passed or arm the idle grace timer