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From: Bart Van Assche <bvanassche@acm.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
	Bart Van Assche <bvanassche@acm.org>
Subject: [PATCH v3 0/3] blk-mq: Fix a race between iterating over requests and freeing requests
Date: Thu, 25 Mar 2021 19:29:16 -0700	[thread overview]
Message-ID: <20210326022919.19638-1-bvanassche@acm.org> (raw)

Hi Jens,

This patch series fixes the race between iterating over requests and
freeing requests that has been reported by multiple different users over
the past two years. Please consider this patch series for kernel v5.13.

Thank you,

Bart.

Changes compared to v2:
- Converted the single v2 patch into a series of three patches.
- Switched from SRCU to a combination of RCU and semaphores.

Changes compared to v1:
- Reformatted patch description.
- Added Tested-by/Reviewed-by tags.
- Changed srcu_barrier() calls into synchronize_srcu() calls.

Bart Van Assche (3):
  blk-mq: Move the elevator_exit() definition
  blk-mq: Introduce atomic variants of the tag iteration functions
  blk-mq: Fix races between iterating over requests and freeing requests

 block/blk-core.c          | 34 ++++++++++++++-
 block/blk-mq-tag.c        | 87 ++++++++++++++++++++++++++++++++++-----
 block/blk-mq-tag.h        |  8 ++--
 block/blk-mq.c            | 31 ++++++++++----
 block/blk-mq.h            |  1 +
 block/blk.h               | 11 +----
 block/elevator.c          |  9 ++++
 drivers/scsi/hosts.c      | 16 +++----
 drivers/scsi/ufs/ufshcd.c |  4 +-
 include/linux/blk-mq.h    |  2 +
 10 files changed, 160 insertions(+), 43 deletions(-)


             reply	other threads:[~2021-03-26  2:30 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26  2:29 Bart Van Assche [this message]
2021-03-26  2:29 ` [PATCH v3 1/3] blk-mq: Move the elevator_exit() definition Bart Van Assche
2021-03-26  2:29 ` [PATCH v3 2/3] blk-mq: Introduce atomic variants of the tag iteration functions Bart Van Assche
2021-03-26  2:29 ` [PATCH v3 3/3] blk-mq: Fix a race between iterating over requests and freeing requests Bart Van Assche
2021-03-26  8:44   ` Shinichiro Kawasaki
2021-03-29  1:33     ` Bart Van Assche

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