fm10k: avoid divide by zero in rare cases when device is resetting

It is possible that under rare circumstances the device is undergoing
a reset, such as when a PFLR occurs, and the device may be transmitting
simultaneously. In this case, we might attempt to divide by zero when
finding the proper r_idx. Instead, lets read the num_tx_queues once,
and make sure it's non-zero.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
index e69d49d..77d495f 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
@@ -643,9 +643,13 @@ int fm10k_close(struct net_device *netdev)
 static netdev_tx_t fm10k_xmit_frame(struct sk_buff *skb, struct net_device *dev)
 {
        struct fm10k_intfc *interface = netdev_priv(dev);
+       int num_tx_queues = READ_ONCE(interface->num_tx_queues);
        unsigned int r_idx = skb->queue_mapping;
        int err;
 
+       if (!num_tx_queues)
+               return NETDEV_TX_BUSY;
+
        if ((skb->protocol == htons(ETH_P_8021Q)) &&
            !skb_vlan_tag_present(skb)) {
                /* FM10K only supports hardware tagging, any tags in frame
@@ -698,8 +702,8 @@ static netdev_tx_t fm10k_xmit_frame(struct sk_buff *skb, struct net_device *dev)
                __skb_put(skb, pad_len);
        }
 
-       if (r_idx >= interface->num_tx_queues)
-               r_idx %= interface->num_tx_queues;
+       if (r_idx >= num_tx_queues)
+               r_idx %= num_tx_queues;
 
        err = fm10k_xmit_frame_ring(skb, interface->tx_ring[r_idx]);