blk-mq: quiesce a queue that joins a quiesced tag set

blk_mq_quiesce_tagset() only quiesces the queues on the list at that
moment. A queue added before blk_mq_unquiesce_tagset() runs unquiesced,
and then gets unquiesced without ever having been quiesced, which trips
the warning in blk_mq_unquiesce_queue(). NVMe gets there when a
controller fails while its namespaces are being scanned.

Count the quiesce calls in the tag set and quiesce a joining queue that
many times, under a spinlock that also serializes the two functions. It
can't be tag_list_lock, see commit 59e25ef2b413.

Fixes: 414dd48e882c ("blk-mq: add tagset quiesce interface")
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20261028164415.1262013-37-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions