| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 531/667] bfq: Avoid false marking of bic as stably merged | Date | Tue, 7 Jun 2022 19:03:16 +0200 |
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From: Jan Kara <jack@suse.cz>
commit 70456e5210f40ffdb8f6d905acfdcec5bd5fad9e upstream.
bfq_setup_cooperator() can mark bic as stably merged even though it decides to not merge its bfqqs (when bfq_setup_merge() returns NULL). Make sure to mark bic as stably merged only if we are really going to merge bfqqs.
CC: stable@vger.kernel.org Tested-by: "yukuai (C)" <yukuai3@huawei.com> Fixes: 430a67f9d616 ("block, bfq: merge bursts of newly-created queues") Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220401102752.8599-1-jack@suse.cz Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- block/bfq-iosched.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -2773,9 +2773,12 @@ bfq_setup_cooperator(struct bfq_data *bf struct bfq_queue *new_bfqq = bfq_setup_merge(bfqq, stable_merge_bfqq); - bic->stably_merged = true; - if (new_bfqq && new_bfqq->bic) - new_bfqq->bic->stably_merged = true; + if (new_bfqq) { + bic->stably_merged = true; + if (new_bfqq->bic) + new_bfqq->bic->stably_merged = + true; + } return new_bfqq; } else return NULL;
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