net/hns:bugfix of ethtool -t phy self_test
This patch fixes the phy loopback self_test failed issue. when Marvell Phy Module is loaded, it will powerdown fiber when doing phy loopback self test, which cause phy loopback self_test fail. Signed-off-by: Lin Yun Sheng <linyunsheng@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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