[PATCH] fix locking in queue_requests_store()

queue_requests_store(struct request_queue *q, const char *page, size_t count)

{

	struct request_list *rl = &q->rq;

	unsigned long nr;

	int ret = queue_var_store(&nr, page, count);

	if (nr < BLKDEV_MIN_RQ)

		nr = BLKDEV_MIN_RQ;

	int ret = queue_var_store(&q->nr_requests, page, count);

	if (q->nr_requests < BLKDEV_MIN_RQ)

		q->nr_requests = BLKDEV_MIN_RQ;

	spin_lock_irq(q->queue_lock);

	q->nr_requests = nr;

	blk_queue_congestion_threshold(q);

	if (rl->count[READ] >= queue_congestion_on_threshold(q))

		blk_clear_queue_full(q, WRITE);

		wake_up(&rl->wait[WRITE]);

	}

	spin_unlock_irq(q->queue_lock);

	return ret;

}