linux-imx

    q->mq_ops = set->ops;

​

    q->poll_cb = blk_stat_alloc_callback(blk_mq_poll_stats_fn,

                         blk_mq_poll_stats_bkt,

                         BLK_MQ_POLL_STATS_BKTS, q);

    if (!q->poll_cb)

        goto err_exit;

​

    if (blk_mq_alloc_ctxs(q))

​

    /* init q->mq_kobj and sw queues' kobjects */

    blk_mq_sysfs_init(q);

​

    q->nr_queues = nr_hw_queues(set);

    q->queue_hw_ctx = kcalloc_node(q->nr_queues, sizeof(*(q->queue_hw_ctx)),

                        GFP_KERNEL, set->numa_node);

    if (!q->queue_hw_ctx)

        goto err_sys_init;

​

            return ERR_PTR(ret);

    }

​

    return q;

​

err_hctxs:

    kfree(q->queue_hw_ctx);

err_sys_init:

    blk_mq_sysfs_deinit(q);

err_exit:

    q->mq_ops = NULL;

    return ERR_PTR(-ENOMEM);

}

EXPORT_SYMBOL(blk_mq_init_allocated_queue);

​

/* tags can _not_ be used after returning from blk_mq_exit_queue */

void blk_mq_exit_queue(struct request_queue *q)

{

    struct blk_mq_tag_set   *set = q->tag_set;