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[PATCH review for 4.9 18/50] md/linear: shutup lockdep warnning

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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>
---
 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 b0c0aef92a37..12abf69d568a 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

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[PATCH review for 4.9 01/50] xen-netback: Use GFP_ATOMIC to allocate  hash "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 17/50] f2fs: do not wait for writeback in  write_begin "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 15/50] sched/fair: Update rq clock before  changing a task's CPU affinity "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 26/50] ASoC: mediatek: add I2C dependency for  CS42XX8 "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 42/50] hrtimer: Catch invalid clockids again "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 06/50] mac80211_hwsim: check  HWSIM_ATTR_RADIO_NAME length "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 07/50] ALSA: hda: Add Geminilake HDMI codec ID "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 05/50] initramfs: finish fput() before  accessing any binary from initramfs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 14/50] f2fs: do SSR for data when there is  enough free space "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 02/50] locking/lockdep: Add nest_lock integrity  test "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 18/50] md/linear: shutup lockdep warnning "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 12/50] netfilter: nf_ct_expect: Change  __nf_ct_expect_check() return value. "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200
  [PATCH review for 4.9 24/50] slub: do not merge cache if slub_debug  contains a never-merge flag "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-25 03:40 +0200

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