There was a missing unlock on the error path if __map_request() failed.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>
        if (req->r_sent == 0) {
                rc = __map_request(osdc, req);
                if (rc < 0)
-                       return rc;
+                       goto out_unlock;
                if (req->r_osd == NULL) {
                        dout("send_request %p no up osds in pg\n", req);
                        ceph_monc_request_next_osdmap(&osdc->client->monc);
                        }
                }
        }
+
+out_unlock:
        mutex_unlock(&osdc->request_mutex);
        up_read(&osdc->map_sem);
        return rc;