[PATCH 007 of 9] md: prevent duplicates in bind_rdev_to_array

[NeilBrown]

From: Dan Williams <dan.j.williams@xxxxxxxxx>

Found when trying to reassemble an active externally managed array.
Without this check we hit the more noisy "sysfs duplicate" warning in
the later call to kobject_add.

Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Neil Brown <neilb@xxxxxxx>

### Diffstat output
 ./drivers/md/md.c |    5 +++++
 1 file changed, 5 insertions(+)

diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c	2008-04-29 12:27:57.000000000 +1000
+++ ./drivers/md/md.c	2008-04-29 12:27:57.000000000 +1000
@@ -1369,6 +1369,11 @@ static int bind_rdev_to_array(mdk_rdev_t
 		MD_BUG();
 		return -EINVAL;
 	}
+
+	/* prevent duplicates */
+	if (find_rdev(mddev, rdev->bdev->bd_dev))
+		return -EEXIST;
+
 	/* make sure rdev->size exceeds mddev->size */
 	if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
 		if (mddev->pers) {
--
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