netdev - [net] ixgbe: check return value of napi_complete

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Date:   Wed,  3 Oct 2018 11:30:35 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Song Liu <songliubraving@...com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, stable@...r.kernel.org,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net] ixgbe: check return value of napi_complete_done()

From: Song Liu <songliubraving@...com>

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

Cc: stable@...r.kernel.org # 4.10+
Suggested-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Song Liu <songliubraving@...com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index f27d73a7bf16..6cdd58d9d461 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -3196,11 +3196,13 @@ 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);
 }
-- 
2.17.1