net: hns3: add netdev reset check for hns3_set_tunable()

When pci device reset failed, it does uninit operation and priv->ring
is NULL, it causes accessing NULL pointer error.

Add netdev reset check for hns3_set_tunable() to fix it.

Fixes: 99f6b5fb5f63 ("net: hns3: use bounce buffer when rx page can not be reused")
Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index ae30dbe..49e7b02 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -1766,9 +1766,6 @@ static int hns3_set_tx_spare_buf_size(struct net_device *netdev,
        struct hnae3_handle *h = priv->ae_handle;
        int ret;
 
-       if (hns3_nic_resetting(netdev))
-               return -EBUSY;
-
        h->kinfo.tx_spare_buf_size = data;
 
        ret = hns3_reset_notify(h, HNAE3_DOWN_CLIENT);
@@ -1799,6 +1796,11 @@ static int hns3_set_tunable(struct net_device *netdev,
        struct hnae3_handle *h = priv->ae_handle;
        int i, ret = 0;
 
+       if (hns3_nic_resetting(netdev) || !priv->ring) {
+               netdev_err(netdev, "failed to set tunable value, dev resetting!");
+               return -EBUSY;
+       }
+
        switch (tuna->id) {
        case ETHTOOL_TX_COPYBREAK:
                priv->tx_copybreak = *(u32 *)data;