From 93803e0140c6216b68fe926ccc611297120da273 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 7 Mar 2011 08:59:06 +0100 Subject: [PATCH] cfq-iosched: fix race in cfq_set_request() We need to hold the queue lock over the reference increment, it's not atomic anymore. Signed-off-by: Jens Axboe --- block/cfq-iosched.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 3202c7e87fb3..fb2141ec205c 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -3675,12 +3675,11 @@ new_queue: cfqq->allocated[rw]++; - spin_unlock_irqrestore(q->queue_lock, flags); - cfqq->ref++; rq->elevator_private[0] = cic; rq->elevator_private[1] = cfqq; rq->elevator_private[2] = cfq_ref_get_cfqg(cfqq->cfqg); + spin_unlock_irqrestore(q->queue_lock, flags); return 0; queue_fail: