From 453369cd64255d09b5221456f0679b63c8543405 Mon Sep 17 00:00:00 2001
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Date: Tue, 22 May 2012 13:55:32 +1000
Subject: [PATCH] --- yaml --- r: 305964 b: refs/heads/master c:
 0c098220e2320c1f0c9339d0ff05c5e04672133a h: refs/heads/master v: v3

---
 [refs]                | 2 +-
 trunk/drivers/md/md.c | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 4cc314d3dffa..d90fa986fe84 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4f0a5e012cf41321d611e7cad63e1017d143d138
+refs/heads/master: 0c098220e2320c1f0c9339d0ff05c5e04672133a
diff --git a/trunk/drivers/md/md.c b/trunk/drivers/md/md.c
index 4c9836885d3e..1c2f9048e1ae 100644
--- a/trunk/drivers/md/md.c
+++ b/trunk/drivers/md/md.c
@@ -6618,6 +6618,9 @@ static int md_open(struct block_device *bdev, fmode_t mode)
 	struct mddev *mddev = mddev_find(bdev->bd_dev);
 	int err;
 
+	if (!mddev)
+		return -ENODEV;
+
 	if (mddev->gendisk != bdev->bd_disk) {
 		/* we are racing with mddev_put which is discarding this
 		 * bd_disk.