linux-kernel - [PATCH v2 0/2] blk-mq: fix update nr

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Message-Id: <20250819012917.523272-1-yukuai1@huaweicloud.com>
Date: Tue, 19 Aug 2025 09:29:15 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: yukuai3@...wei.com,
	axboe@...nel.dk,
	bvanassche@....org,
	ming.lei@...hat.com,
	hare@...e.de,
	nilay@...ux.ibm.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	johnny.chenyi@...wei.com
Subject: [PATCH v2 0/2] blk-mq: fix update nr_requests regressions

From: Yu Kuai <yukuai3@...wei.com>

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   | 21 ++++-----------------
 block/blk-mq-sched.c  |  3 +++
 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 | 10 ++++------
 block/mq-deadline.c   | 15 ++-------------
 8 files changed, 38 insertions(+), 48 deletions(-)

-- 
2.39.2