linux-imx

}

​

void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio)

{

    struct bfq_data *bfqd = bic_to_bfqd(bic);

    struct bfq_group *bfqg = NULL;

    uint64_t serial_nr;

​

    rcu_read_lock();

​

    /*

     * Check whether blkcg has changed.  The condition may trigger

     * spuriously on a newly created cic but there's no harm.

     */

    if (unlikely(!bfqd) || likely(bic->blkcg_serial_nr == serial_nr))

        goto out;

​

    /*

     * Update blkg_path for bfq_log_* functions. We cache this

     * path, and update it here, for the following

     * reasons. Operations on blkg objects in blk-cgroup are

     * protected with the request_queue lock, and not with the

     * lock that protects the instances of this scheduler

     * (bfqd->lock). This exposes BFQ to the following sort of

     * race.

     *

     * The blkg_lookup performed in bfq_get_queue, protected