[PATCH 0/5] blk-mq: allow to run queue if queue refcount is held

[Ming Lei <ming.lei@redhat.com>]

Hi,

Since 45a9c9d909b2 ("blk-mq: Fix a use-after-free"), run queue isn't
allowed during cleanup queue even though queue refcount is held.

This change has caused lots of kernel oops triggered in run queue path,
turns out it isn't easy to fix them all.

So move freeing of hw queue resources into queue's release handler, then
the above issue is fixed. Meantime, this way is safe given freeing hw
queue resource doesn't require to use tags.

Thanks,

Ming Lei (5):
  blk-mq: re-organize blk_mq_exit_hctx() into two parts
  blk-mq: re-organize blk_mq_exit_hw_queues() into two parts
  blk-mq: free hw queues in queue's release handler
  block: don't drain in-progress dispatch in blk_cleanup_queue()
  SCSI: don't grab queue usage counter before run queue

 block/blk-core.c        | 14 +-------------
 block/blk-mq.c          | 32 +++++++++++++++++++++++++-------
 block/blk-mq.h          |  3 ++-
 drivers/scsi/scsi_lib.c |  7 -------
 4 files changed, 28 insertions(+), 28 deletions(-)

Cc: James Smart <james.smart@broadcom.com>
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: linux-scsi@vger.kernel.org,
Cc: Martin K . Petersen <martin.petersen@oracle.com>,
Cc: Christoph Hellwig <hch@lst.de>,
Cc: James E . J . Bottomley <jejb@linux.vnet.ibm.com>,
Cc: jianchao wang <jianchao.w.wang@oracle.com>

-- 
2.9.5