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dm-crypt: fix warning in shutdown path 

The counter for the number of allocated pages includes pages in the
mempool's reserve, so checking that the number of allocated pages is 0
needs to happen after we exit the mempool.

Fixes: 6f1c819c21 ("dm: convert to bioset_init()/mempool_init()")
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Reported-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Mike Snitzer <snitzer@redhat.com>

Fixed to always just use percpu_counter_sum()

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kent Overstreet 2018-06-02 13:45:04 -04:00 committed by Jens Axboe
parent 9cfd5a9538
commit d00a11df69
1 changed files with 3 additions and 4 deletions
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7
drivers/md/dm-crypt.c
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@ -2221,14 +2221,13 @@ static void crypt_dtr(struct dm_target *ti)
bioset_exit(&cc->bs);
if (mempool_initialized(&cc->page_pool))
WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
percpu_counter_destroy(&cc->n_allocated_pages);
mempool_exit(&cc->page_pool);
mempool_exit(&cc->req_pool);
mempool_exit(&cc->tag_pool);
WARN_ON(percpu_counter_sum(&cc->n_allocated_pages) != 0);
percpu_counter_destroy(&cc->n_allocated_pages);
if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
cc->iv_gen_ops->dtr(cc);