[PATCH 5.10 016/103] net: hns3: fix a phy loopback fail issue

[Greg Kroah-Hartman]

From: Yonglong Liu <liuyongl...@huawei.com>

[ Upstream commit f04bbcbf1e38d192e94bbfa126731a52332c40b1 ]

When phy driver does not implement the set_loopback interface,
phy loopback test will return -EOPNOTSUPP, and the loopback test
will fail. So when phy driver does not implement the set_loopback
interface, don't do phy loopback test.

Fixes: c9765a89d142 ("net: hns3: add phy selftest function")
Signed-off-by: Yonglong Liu <liuyongl...@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazh...@huawei.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -752,7 +752,8 @@ static int hclge_get_sset_count(struct h
                handle->flags |= HNAE3_SUPPORT_SERDES_SERIAL_LOOPBACK;
                handle->flags |= HNAE3_SUPPORT_SERDES_PARALLEL_LOOPBACK;
 
-               if (hdev->hw.mac.phydev) {
+               if (hdev->hw.mac.phydev && hdev->hw.mac.phydev->drv &&
+                   hdev->hw.mac.phydev->drv->set_loopback) {
                        count += 1;
                        handle->flags |= HNAE3_SUPPORT_PHY_LOOPBACK;
                }