[Intel-wired-lan] [PATCH iwl-net 1/2] i40e: avoid double calling i40e_pf_rxq_wait()

[Maciej Fijalkowski]

Currently, when interface is being brought down and
i40e_vsi_stop_rings() is called, i40e_pf_rxq_wait() is called two times,
which is wrong. To showcase this scenario, simplified call stack looks
as follows:

i40e_vsi_stop_rings()
        i40e_control wait rx_q()
                i40e_control_rx_q()
                i40e_pf_rxq_wait()
        i40e_vsi_wait_queues_disabled()
                i40e_pf_rxq_wait()  // redundant call

To fix this, let us s/i40e_control_wait_rx_q/i40e_control_rx_q within
i40e_vsi_stop_rings().

Fixes: 65662a8dcdd0 ("i40e: Fix logic of disabling queues")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkow...@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c 
b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 6e7fd473abfd..2c46a5e7d222 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -4926,7 +4926,7 @@ int i40e_vsi_start_rings(struct i40e_vsi *vsi)
 void i40e_vsi_stop_rings(struct i40e_vsi *vsi)
 {
        struct i40e_pf *pf = vsi->back;
-       int pf_q, err, q_end;
+       int pf_q, q_end;
 
        /* When port TX is suspended, don't wait */
        if (test_bit(__I40E_PORT_SUSPENDED, vsi->back->state))
@@ -4936,16 +4936,10 @@ void i40e_vsi_stop_rings(struct i40e_vsi *vsi)
        for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++)
                i40e_pre_tx_queue_cfg(&pf->hw, (u32)pf_q, false);
 
-       for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++) {
-               err = i40e_control_wait_rx_q(pf, pf_q, false);
-               if (err)
-                       dev_info(&pf->pdev->dev,
-                                "VSI seid %d Rx ring %d disable timeout\n",
-                                vsi->seid, pf_q);
-       }
+       for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++)
+               i40e_control_rx_q(pf, pf_q, false);
 
        msleep(I40E_DISABLE_TX_GAP_MSEC);
-       pf_q = vsi->base_queue;
        for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++)
                wr32(&pf->hw, I40E_QTX_ENA(pf_q), 0);
 
-- 
2.34.1