linux-kernel - [PATCH 5.13 072/175] io-wq: fix lack of acct->nr_workers < acct->max

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Date:   Tue, 10 Aug 2021 19:29:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hao Xu <haoxu@...ux.alibaba.com>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 072/175] io-wq: fix lack of acct->nr_workers < acct->max_workers judgement

From: Hao Xu <haoxu@...ux.alibaba.com>

[ Upstream commit 21698274da5b6fc724b005bc7ec3e6b9fbcfaa06 ]

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

Fixes: 685fe7feedb9 ("io-wq: eliminate the need for a manager thread")
Signed-off-by: Hao Xu <haoxu@...ux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/io-wq.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/io-wq.c b/fs/io-wq.c
index e00ac0969470..400fba839734 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -281,9 +281,17 @@ 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);
 }
-- 
2.30.2