[PATCH] Add blk_start_queueing() helper

CFQ implements this on its own now, but it's really block layer
knowledge. Tells a device queue to start dispatching requests to
the driver, taking care to unplug if needed. Also fixes the issue
where as/cfq will invoke a stopped queue, which we really don't
want.

Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 1 insertions, 2 deletions

diff --git a/block/as-iosched.c b/block/as-iosched.c
index f6dc95489316..bc13dc0b29be 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -1280,8 +1280,7 @@ static void as_work_handler(void *data)
         unsigned long flags;
 
         spin_lock_irqsave(q->queue_lock, flags);
-        if (!as_queue_empty(q))
-                q->request_fn(q);
+        blk_start_queueing(q);
         spin_unlock_irqrestore(q->queue_lock, flags);
 }