Three patches to fix the ordering of freezing a queue with
blk_mq_freeze_queue() and obtaining a device queue limits lock with
queue_limits_start_update(). These changes ensure that a devie queue is
always frozen after the device limits lock is obtained to avoid
potential ABBA deadlocks in drivers that need to issue commands to probe
a device limits with the limits lock held (e.g. the SCSI sd driver).
Damien Le Moal (3):
block: Fix sysfs queue freeze and limits lock order
block: Fix __blk_mq_update_nr_hw_queues() queue freeze and limits lock
order
nvme: Fix queue freeze and limits lock order
block/blk-mq.c | 25 +++++---
block/blk-sysfs.c | 123 ++++++++++++++++++++-------------------
drivers/nvme/host/core.c | 8 ++-
3 files changed, 85 insertions(+), 71 deletions(-)
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2.47.1
