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-rw-r--r--block/cfq-iosched.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 839086dcb0af..df82755ac40b 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1603,7 +1603,12 @@ static void
cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
struct cfq_io_context *cic)
{
- int enable_idle = cfq_cfqq_idle_window(cfqq);
+ int enable_idle;
+
+ if (!cfq_cfqq_sync(cfqq))
+ return;
+
+ enable_idle = cfq_cfqq_idle_window(cfqq);
if (!cic->ioc->task || !cfqd->cfq_slice_idle ||
(cfqd->hw_tag && CIC_SEEKY(cic)))