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block, bfq: release oom-queue ref to root group on exit 

On scheduler init, a reference to the root group, and a reference to
its corresponding blkg are taken for the oom queue. Yet these
references are not released on scheduler exit, which prevents these
objects from be freed. This commit adds the missing reference
releases.

Reported-by: Davide Ferrari <davideferrari8@gmail.com>
Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Paolo Valente 2018-01-09 10:27:59 +01:00 committed by Jens Axboe
parent 52257ffbfc
commit 0d52af5905
1 changed files with 3 additions and 0 deletions
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block/bfq-iosched.c
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@ -4893,6 +4893,9 @@ static void bfq_exit_queue(struct elevator_queue *e)
hrtimer_cancel(&bfqd->idle_slice_timer);
/* release oom-queue reference to root group */
bfqg_and_blkg_put(bfqd->root_group);
#ifdef CONFIG_BFQ_GROUP_IOSCHED
blkcg_deactivate_policy(bfqd->queue, &blkcg_policy_bfq);
#else