md: unlock mddev_lock on an error path.

This error path retuns while still holding the lock - bad.

Fixes: 6791875e2e53 ("md: make reconfig_mutex optional for writes to md sysfs files.")
Cc: stable@vger.kernel.org (v4.0+)
Signed-off-by: NeilBrown <neilb@suse.com>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 939739f0f881fc8cc4497bb10a6c0098c36747a6..5fcce7371ee925dbcd107463b9566db760a3fa52 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4014,8 +4014,10 @@ new_dev_store(struct mddev *mddev, const char *buf, size_t len)
        else
                rdev = md_import_device(dev, -1, -1);
 
-       if (IS_ERR(rdev))
+       if (IS_ERR(rdev)) {
+               mddev_unlock(mddev);
                return PTR_ERR(rdev);
+       }
        err = bind_rdev_to_array(rdev, mddev);
  out:
        if (err)