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io-wq: fix lack of acct->nr_workers < acct->max_workers judgement 

There should be this judgement before we create an io-worker

Fixes: 685fe7feed ("io-wq: eliminate the need for a manager thread")
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hao Xu 2021-08-05 18:05:38 +08:00 committed by Jens Axboe
parent 3d4e4face9
commit 21698274da
1 changed files with 9 additions and 1 deletions
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10
fs/io-wq.c
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@ -280,9 +280,17 @@ static void create_worker_cb(struct callback_head *cb)
{
struct create_worker_data *cwd;
struct io_wq *wq;
struct io_wqe *wqe;
struct io_wqe_acct *acct;
cwd = container_of(cb, struct create_worker_data, work);
wq = cwd->wqe->wq;
wqe = cwd->wqe;
wq = wqe->wq;
acct = &wqe->acct[cwd->index];
raw_spin_lock_irq(&wqe->lock);
if (acct->nr_workers < acct->max_workers)
acct->nr_workers++;
raw_spin_unlock_irq(&wqe->lock);
create_io_worker(wq, cwd->wqe, cwd->index);
kfree(cwd);
}