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md/linear: shutup lockdep warnning

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[ 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>
This commit is contained in:
Shaohua Li 2017-02-21 11:57:01 -08:00 committed by Greg Kroah-Hartman
parent 48ca88f935
commit d14591e83b
1 changed files with 2 additions and 1 deletions
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3
drivers/md/linear.c
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@ -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");