diff options
| author | Yu Kuai <yukuai3@huawei.com> | 2022-05-13 10:35:06 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-10 18:15:37 +0100 |
| commit | 4302806dbfea3efe9909c00a8bfabdf9c07fc77f (patch) | |
| tree | d6f6d4f85ae05e3c943677919909a9ed26ada516 /block | |
| parent | 3e4697ffdfbb38a2755012c4e571546c89ab6422 (diff) | |
block, bfq: protect 'bfqd->queued' by 'bfqd->lock'
commit 181490d5321806e537dc5386db5ea640b826bf78 upstream.
If bfq_schedule_dispatch() is called from bfq_idle_slice_timer_body(),
then 'bfqd->queued' is read without holding 'bfqd->lock'. This is
wrong since it can be wrote concurrently.
Fix the problem by holding 'bfqd->lock' in such case.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220513023507.2625717-2-yukuai3@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Cc: Khazhy Kumykov <khazhy@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bfq-iosched.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 4b862f18f4b2..7d8fe13573f6 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -461,6 +461,8 @@ static struct bfq_io_cq *bfq_bic_lookup(struct bfq_data *bfqd, */ void bfq_schedule_dispatch(struct bfq_data *bfqd) { + lockdep_assert_held(&bfqd->lock); + if (bfqd->queued != 0) { bfq_log(bfqd, "schedule dispatch"); blk_mq_run_hw_queues(bfqd->queue, true); @@ -6745,8 +6747,8 @@ bfq_idle_slice_timer_body(struct bfq_data *bfqd, struct bfq_queue *bfqq) bfq_bfqq_expire(bfqd, bfqq, true, reason); schedule_dispatch: - spin_unlock_irqrestore(&bfqd->lock, flags); bfq_schedule_dispatch(bfqd); + spin_unlock_irqrestore(&bfqd->lock, flags); } /* |