The Coverity checker spotted the following check-after-use of the 
"qdisc" variable in net/mac80211/wme.c introduced by
commit 9e7234923789897858e1a475c579b5e2e6ad5b74
(mac80211: A-MPDU Tx adding qdisc support):

<--  snip  -->

...
void ieee80211_requeue(struct ieee80211_local *local, int queue)
{
        struct Qdisc *root_qd = local->mdev->qdisc_sleeping;
        struct ieee80211_sched_data *q = qdisc_priv(root_qd);
        struct Qdisc *qdisc = q->queues[queue];
        struct sk_buff *skb = NULL;
        u32 len = qdisc->q.qlen;    <------

        if (!qdisc || !qdisc->dequeue)
                return;
...

<--  snip  -->

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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