From: Shaohua Li <s...@fb.com>
[ Upstream commit d939cdfde34f50b95254b375f498447c82190b3e ]
Commit 03a9e24(md linear: fix a race between linear_add() and
linear_congested()) introduces the warnning.
Acked-by: Coly Li <col...@suse.de>
Signed-off-by: Shaohua Li <s...@fb.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
---
drivers/md/linear.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 6ba3227e29b2..7ffb20ec1a46 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -223,7 +223,8 @@ static int linear_add(struct mddev *mddev, struct md_rdev
*rdev)
* oldconf until no one uses it anymore.
*/
mddev_suspend(mddev);
- oldconf = rcu_dereference(mddev->private);
+ oldconf = rcu_dereference_protected(mddev->private,
+ lockdep_is_held(&mddev->reconfig_mutex));
mddev->raid_disks++;
WARN_ONCE(mddev->raid_disks != newconf->raid_disks,
"copied raid_disks doesn't match mddev->raid_disks");
--
2.11.0
