pkt_sched: Add BH protection for qdisc_stab_lock.
Since qdisc_stab_lock is used in qdisc_put_stab(), which is called in BH context from __qdisc_destroy() RCU callback, softirq safe locking is needed. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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