linux-kernel - [PATCH v2 3/4] md/raid10: fix improper BUG_ON() in raise

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Message-Id: <20220914014914.398712-4-yukuai1@huaweicloud.com>
Date:   Wed, 14 Sep 2022 09:49:13 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     song@...nel.org, logang@...tatee.com, guoqing.jiang@...ux.dev,
        pmenzel@...gen.mpg.de
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com
Subject: [PATCH v2 3/4] md/raid10: fix improper BUG_ON() in raise_barrier()

From: Yu Kuai <yukuai3@...wei.com>

'conf->barrier' is protected by 'conf->resync_lock', reading
'conf->barrier' without holding the lock is wrong.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/raid10.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 0edcd98461fe..377d4641bb54 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -936,8 +936,8 @@ static void flush_pending_writes(struct r10conf *conf)
 
 static void raise_barrier(struct r10conf *conf, int force)
 {
-	BUG_ON(force && !conf->barrier);
 	spin_lock_irq(&conf->resync_lock);
+	BUG_ON(force && !conf->barrier);
 
 	/* Wait until no block IO is waiting (unless 'force') */
 	wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting,
-- 
2.31.1