[NET]: Fix TX timeout regression in Intel drivers.

This fixes a regression added by changeset
53e52c729cc169db82a6105fac7a166e10c2ec36 ("[NET]: Make ->poll()
breakout consistent in Intel ethernet drivers.")

As pointed out by Jesse Brandeburg, for three of the drivers edited
above there is breakout logic in the *_clean_tx_irq() code to prevent
running TX reclaim forever.  If this occurs, we have to elide NAPI
poll completion or else those TX events will never be serviced.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Jesse Brandeburg <jesse.brandeburg@intel.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index a56491617661..de3f45e4c5ae 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -1468,13 +1468,16 @@ static int ixgbe_clean(struct napi_struct *napi, int budget)
         struct ixgbe_adapter *adapter = container_of(napi,
                                         struct ixgbe_adapter, napi);
         struct net_device *netdev = adapter->netdev;
-        int work_done = 0;
+        int tx_cleaned = 0, work_done = 0;
 
         /* In non-MSIX case, there is no multi-Tx/Rx queue */
-        ixgbe_clean_tx_irq(adapter, adapter->tx_ring);
+        tx_cleaned = ixgbe_clean_tx_irq(adapter, adapter->tx_ring);
         ixgbe_clean_rx_irq(adapter, &adapter->rx_ring[0], &work_done,
                            budget);
 
+        if (tx_cleaned)
+                work_done = budget;
+
         /* If budget not fully consumed, exit the polling mode */
         if (work_done < budget) {
                 netif_rx_complete(netdev, napi);