This is a note to let you know that I've just added the patch titled
blk-cgroup: bypass blkcg_deactivate_policy after destroying
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
blk-cgroup-bypass-blkcg_deactivate_policy-after-dest.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 52fe32b78b6f984f18b0f8672d5f729a2d5cc31e
Author: Ming Lei <ming.lei@xxxxxxxxxx>
Date: Fri Nov 17 10:35:24 2023 +0800
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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231117023527.3188627-4-ming.lei@xxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 3ee4c1217b636..fd81a73708645 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -425,6 +425,7 @@ static void blkg_destroy_all(struct request_queue *q)
{
struct blkcg_gq *blkg, *n;
int count = BLKG_DESTROY_BATCH_SIZE;
+ int i;
restart:
spin_lock_irq(&q->queue_lock);
@@ -447,6 +448,18 @@ static void blkg_destroy_all(struct request_queue *q)
}
}
+ /*
+ * 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;
spin_unlock_irq(&q->queue_lock);
}
