[PATCH net] net: hns: Bugfix for Tx timeout handling in hns driver

[Lin Yun Sheng]

When hns port type is not debug mode, netif_tx_disable is called
when there is a tx timeout, which requires system reboot to return
to normal state. This patch fix this problem by resetting the net
dev.

Fixes: b5996f11ea54 ("net: add Hisilicon Network Subsystem basic ethernet 
support")
Signed-off-by: Lin Yun Sheng <linyunsh...@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns/hns_enet.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c 
b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index fe166e0..3987699 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -1378,13 +1378,20 @@ void hns_nic_net_reset(struct net_device *ndev)
 void hns_nic_net_reinit(struct net_device *netdev)
 {
        struct hns_nic_priv *priv = netdev_priv(netdev);
+       enum hnae_port_type type = priv->ae_handle->port_type;
 
        netif_trans_update(priv->netdev);
        while (test_and_set_bit(NIC_STATE_REINITING, &priv->state))
                usleep_range(1000, 2000);
 
        hns_nic_net_down(netdev);
-       hns_nic_net_reset(netdev);
+
+       /* Only do hns_nic_net_reset in debug mode
+        * because of hardware limitation.
+        */
+       if (type == HNAE_PORT_DEBUG)
+               hns_nic_net_reset(netdev);
+
        (void)hns_nic_net_up(netdev);
        clear_bit(NIC_STATE_REINITING, &priv->state);
 }
@@ -1997,13 +2004,8 @@ static void hns_nic_reset_subtask(struct hns_nic_priv 
*priv)
        rtnl_lock();
        /* put off any impending NetWatchDogTimeout */
        netif_trans_update(priv->netdev);
+       hns_nic_net_reinit(priv->netdev);
 
-       if (type == HNAE_PORT_DEBUG) {
-               hns_nic_net_reinit(priv->netdev);
-       } else {
-               netif_carrier_off(priv->netdev);
-               netif_tx_disable(priv->netdev);
-       }
        rtnl_unlock();
 }
 
-- 
1.9.1