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blk-mq: move blk_mq_update_nr_hw_queues synchronize_rcu call

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This fixes the
4.9 backport commit f530afb974c2e82047bd6220303a2dbe30eff304
which was
upstream commit f5bbbbe4d63577026f908a809f22f5fd5a90ea1f.

The upstream commit added a call to synchronize_rcu to
_blk_mq_update_nr_hw_queues, just after freezing queues.

In the backport this landed (in blk_mq_update_nr_hw_queues instead),
just after unfreezeing queues.

This commit moves the call to its intended place.

Fixes: f530afb974c2 ("blk-mq: sync the update nr_hw_queues with blk_mq_queue_tag_busy_iter")
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Giuliano Procida 2020-06-18 19:30:22 +01:00 committed by Greg Kroah-Hartman
parent ed80f400f6
commit 6754baabb8
1 changed files with 4 additions and 4 deletions
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8
block/blk-mq.c
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@ -2331,6 +2331,10 @@ void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues)
list_for_each_entry(q, &set->tag_list, tag_set_list)
blk_mq_freeze_queue(q);
/*
* Sync with blk_mq_queue_tag_busy_iter.
*/
synchronize_rcu();
set->nr_hw_queues = nr_hw_queues;
list_for_each_entry(q, &set->tag_list, tag_set_list) {
@ -2346,10 +2350,6 @@ void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues)
list_for_each_entry(q, &set->tag_list, tag_set_list)
blk_mq_unfreeze_queue(q);
/*
* Sync with blk_mq_queue_tag_busy_iter.
*/
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(blk_mq_update_nr_hw_queues);