net: sched: introduce and use qdisc tree flush/purge helpers
The same code to flush qdisc tree and purge the qdisc queue is duplicated in many places and in most cases it does not respect NOLOCK qdisc: the global backlog len is used and the per CPU values are ignored. This change addresses the above, factoring-out the relevant code and using the helpers introduced by the previous patch to fetch the correct backlog len. Fixes: c5ad119f ("net: sched: pfifo_fast use skb_array") Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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