ixgbe: check return value of napi_complete_done()

commit 4233cfe6ec4683497d7318f55ce7617e97f2e610 upstream.

The NIC driver should only enable interrupts when napi_complete_done()
returns true. This patch adds the check for ixgbe.

Cc: stable@vger.kernel.org # 4.10+
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index b68d94b49a8a690416eb9e44db7301906ce07327..42183a8b649c7fe7ca2fdfeff80e707401a56e77 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -3108,11 +3108,13 @@ int ixgbe_poll(struct napi_struct *napi, int budget)
                return budget;
 
        /* all work done, exit the polling mode */
-       napi_complete_done(napi, work_done);
-       if (adapter->rx_itr_setting & 1)
-               ixgbe_set_itr(q_vector);
-       if (!test_bit(__IXGBE_DOWN, &adapter->state))
-               ixgbe_irq_enable_queues(adapter, BIT_ULL(q_vector->v_idx));
+       if (likely(napi_complete_done(napi, work_done))) {
+               if (adapter->rx_itr_setting & 1)
+                       ixgbe_set_itr(q_vector);
+               if (!test_bit(__IXGBE_DOWN, &adapter->state))
+                       ixgbe_irq_enable_queues(adapter,
+                                               BIT_ULL(q_vector->v_idx));
+       }
 
        return min(work_done, budget - 1);
 }