[PATCH 13/15] cfq-iosched: never allow an async queue idling

[Jens Axboe <jens.axboe@oracle.com>]

We don't enable it by default, don't let it get enabled during
runtime.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
 block/cfq-iosched.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 8f76aed..f920527 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1597,7 +1597,12 @@ 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)))
-- 
1.5.1.1.190.g74474

-
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