Commit d00a11df authored Jun 02, 2018 by Kent Overstreet Committed by Jens Axboe Jun 02, 2018

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: 6f1c819c ("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>

parent 9cfd5a95

drivers/md/dm-crypt.c

+3 −4

Original line number	Diff line number	Diff line
		@@ -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);