[PATCH v3 0/2] blk-mq: fix update nr_requests regressions

[Yu Kuai]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

Changes in v3:
 - call depth_updated() directly in init_sched() method in patch 1;
 - fix typos in patch 2;
 - add review for patch 2;
Changes in v2:
 - instead of refactor and cleanups and fix updating nr_requests
 thoroughly, fix the regression in patch 2 the easy way, and dealy
 refactor and cleanups to next merge window.

patch 1 fix regression that elevator async_depth is not updated correctly
if nr_requests changes, first from error path and then for mq-deadline,
and recently for bfq and kyber.

patch 2 fix regression that if nr_requests grow, kernel will panic due
to tags double free.

Yu Kuai (2):
  blk-mq: fix elevator depth_updated method
  blk-mq: fix blk_mq_tags double free while nr_requests grown

 block/bfq-iosched.c   | 22 +++++-----------------
 block/blk-mq-sched.h  | 11 +++++++++++
 block/blk-mq-tag.c    |  1 +
 block/blk-mq.c        | 23 ++++++++++++-----------
 block/elevator.h      |  2 +-
 block/kyber-iosched.c | 19 +++++++++----------
 block/mq-deadline.c   | 16 +++-------------
 7 files changed, 42 insertions(+), 52 deletions(-)

-- 
2.39.2