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When a bearer is removed, calling qdisc reset on a tx queue could have a race condition with qdisc dequeue for lockless qdisc such as pfifo_fast. This change uses a different mechanism not relying on qdisc implementation to achieve packet purge on bearer remove. Change-Id: I8f9201809853b07293896d6cb8e010e9e0904e46 Signed-off-by: Weiyi Chen <quic_weiyic@quicinc.com> Signed-off-by: Sharath Chandra Vurukala <quic_sharathv@quicinc.com> [Dark-Matter7232: Backport to 4.14] Signed-off-by: Dark-Matter7232 <kerneldeveloper7232@gmail.com> Signed-off-by: Forenche <prahul2003@gmail.com>