From: Jan Kara <jack@xxxxxxx>
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@xxxxxxxxxxxxxxx
Tested-by: "yukuai (C)" <yukuai3@xxxxxxxxxx>
Fixes: 430a67f9d616 ("block, bfq: merge bursts of newly-created queues")
Signed-off-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/20220401102752.8599-1-jack@xxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/bfq-iosched.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -2899,9 +2899,12 @@ 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;
