From: Jian Shen <shenjian15@huawei.com>
Date: Fri, 21 Sep 2018 16:41:43 +0100
Subject: net: hns3: Add nic state check before calling netif_tx_wake_queue
Patch-mainline: v4.20-rc1
Git-commit: 7a8101109dd37837f587cd56f3111d4fc17a07f5
References: bsc#1104353 FATE#326415

When nic down, it firstly calls netif_tx_stop_all_queues(), then calls
napi_disable(). But napi_disable() will wait current napi_poll finish,
it may call netif_tx_wake_queue(). This patch fixes it by add nic state
checking.

Fixes: 424eb834a9be ("net: hns3: Unified HNS3 {VF|PF} Ethernet Driver for hip08 SoC")
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1973,6 +1973,7 @@ static int is_valid_clean_head(struct hn
 void hns3_clean_tx_ring(struct hns3_enet_ring *ring)
 {
 	struct net_device *netdev = ring->tqp->handle->kinfo.netdev;
+	struct hns3_nic_priv *priv = netdev_priv(netdev);
 	struct netdev_queue *dev_queue;
 	int bytes, pkts;
 	int head;
@@ -2018,7 +2019,8 @@ void hns3_clean_tx_ring(struct hns3_enet
 		 * sees the new next_to_clean.
 		 */
 		smp_mb();
-		if (netif_tx_queue_stopped(dev_queue)) {
+		if (netif_tx_queue_stopped(dev_queue) &&
+		    !test_bit(HNS3_NIC_STATE_DOWN, &priv->state)) {
 			netif_tx_wake_queue(dev_queue);
 			ring->stats.restart_queue++;
 		}