[PATCH] i40e: Invoke softirqs after napi_reschedule

[Benjamin Poirier]

The following message is logged from time to time when using i40e:
NOHZ: local_softirq_pending 08

i40e may schedule napi from a workqueue. Afterwards, softirqs are not run
in a deterministic time frame. The problem is the same as what was
described in commit ec13ee80145c ("virtio_net: invoke softirqs after
__napi_schedule") and this patch applies the same fix to i40e.

Signed-off-by: Benjamin Poirier <bpoir...@suse.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c 
b/drivers/net/ethernet/intel/i40e/i40e_main.c
index ad4cf63..d65488c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -4621,8 +4621,10 @@ static void i40e_detect_recover_hung_queue(int q_idx, 
struct i40e_vsi *vsi)
         */
        if ((!tx_pending_hw) && i40e_get_tx_pending(tx_ring, true) &&
            (!(val & I40E_PFINT_DYN_CTLN_INTENA_MASK))) {
+               local_bh_disable();
                if (napi_reschedule(&tx_ring->q_vector->napi))
                        tx_ring->tx_stats.tx_lost_interrupt++;
+               local_bh_enable();
        }
 }
 
-- 
2.10.2