Check the status before start it to avoid duplicates.
(From OE-Core rev: ca3ef7d1ef9b1f0dc4d3170b1ad20d5f725872a1)
Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Jeff Polk <jeff.polk@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>