[PATCH linux-4.19.y 0/5] fix memleak of bfq weights_tree node

[Yu Kuai]

Our test found that bfq_weight_counter can leak quite easy. This problem
can be fixed by patch 4, and other patches is needed to backport patch
4.

Federico Motta (2):
  block, bfq: improve asymmetric scenarios detection
  block, bfq: fix asymmetric scenarios detection

Paolo Valente (3):
  block, bfq: fix decrement of num_active_groups
  block, bfq: fix queue removal from weights tree
  block, bfq: fix use after free in bfq_bfqq_expire

 block/bfq-iosched.c | 287 +++++++++++++++++++++++++++-----------------
 block/bfq-iosched.h |  76 +++++++++---
 block/bfq-wf2q.c    |  56 +++++----
 3 files changed, 270 insertions(+), 149 deletions(-)

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2.31.1