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blk-cgroup: bypass blkcg_deactivate_policy after destroying 

[ Upstream commit e63a57303599b17290cd8bc48e6f20b24289a8bc ]

blkcg_deactivate_policy() can be called after blkg_destroy_all()
returns, and it isn't necessary since blkg_destroy_all has covered
policy deactivation.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20231117023527.3188627-4-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ming Lei 2023-11-17 10:35:24 +08:00 committed by Greg Kroah-Hartman
parent e52d0eb48e
commit 94070fd668
1 changed files with 13 additions and 0 deletions
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13
block/blk-cgroup.c
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@ -462,6 +462,7 @@ static void blkg_destroy_all(struct gendisk *disk)
struct request_queue *q = disk->queue; struct request_queue *q = disk->queue;
struct blkcg_gq *blkg, *n; struct blkcg_gq *blkg, *n;
int count = BLKG_DESTROY_BATCH_SIZE; int count = BLKG_DESTROY_BATCH_SIZE;
int i;
restart: restart:
spin_lock_irq(&q->queue_lock); spin_lock_irq(&q->queue_lock);
@ -487,6 +488,18 @@ static void blkg_destroy_all(struct gendisk *disk)
} }
} }
/*
* Mark policy deactivated since policy offline has been done, and
* the free is scheduled, so future blkcg_deactivate_policy() can
* be bypassed
*/
for (i = 0; i < BLKCG_MAX_POLS; i++) {
struct blkcg_policy *pol = blkcg_policy[i];
if (pol)
__clear_bit(pol->plid, q->blkcg_pols);
}
q->root_blkg = NULL; q->root_blkg = NULL;
spin_unlock_irq(&q->queue_lock); spin_unlock_irq(&q->queue_lock);
} }