linux-kernel - [PATCH 5.14 809/849] io-wq: ensure that hash wait lock is IRQ disabling

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Message-Id: <20211115165447.611808255@linuxfoundation.org>
Date:   Mon, 15 Nov 2021 18:04:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.14 809/849] io-wq: ensure that hash wait lock is IRQ disabling

From: Jens Axboe <axboe@...nel.dk>

commit 08bdbd39b58474d762242e1fadb7f2eb9ffcca71 upstream.

A previous commit removed the IRQ safety of the worker and wqe locks,
but that left one spot of the hash wait lock now being done without
already having IRQs disabled.

Ensure that we use the right locking variant for the hashed waitqueue
lock.

Fixes: a9a4aa9fbfc5 ("io-wq: wqe and worker locks no longer need to be IRQ safe")
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/io-wq.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -405,7 +405,7 @@ static void io_wait_on_hash(struct io_wq
 {
 	struct io_wq *wq = wqe->wq;
 
-	spin_lock(&wq->hash->wait.lock);
+	spin_lock_irq(&wq->hash->wait.lock);
 	if (list_empty(&wqe->wait.entry)) {
 		__add_wait_queue(&wq->hash->wait, &wqe->wait);
 		if (!test_bit(hash, &wq->hash->map)) {
@@ -413,7 +413,7 @@ static void io_wait_on_hash(struct io_wq
 			list_del_init(&wqe->wait.entry);
 		}
 	}
-	spin_unlock(&wq->hash->wait.lock);
+	spin_unlock_irq(&wq->hash->wait.lock);
 }
 
 /*