| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 20/51] md/linear: shutup lockdep warnning | Date | Thu, 19 Oct 2017 15:48:41 +0200 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: Shaohua Li <shli@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 <colyli@suse.de> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/md/linear.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -223,7 +223,8 @@ static int linear_add(struct mddev *mdde * 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");
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