igb: Wait 10ms just once after TX queues reset

Move 10ms sleep out of function resetting TX queue.
Reset all the TX queues in one turn and
wait for all of them just once.

Use usleep_range() instead of mdelay() in order not to
affect transmission on other interfaces.
Signed-off-by: NSergey Nemov <sergey.nemov@intel.com>
Tested-by: NAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igb/igb_main.c

@@ -4055,11 +4055,6 @@ void igb_configure_tx_ring(struct igb_adapter *adapter,
 	u64 tdba = ring->dma;
 	int reg_idx = ring->reg_idx;
 
-	/* disable the queue */
-	wr32(E1000_TXDCTL(reg_idx), 0);
-	wrfl();
-	mdelay(10);
-
 	wr32(E1000_TDLEN(reg_idx),
 	     ring->count * sizeof(union e1000_adv_tx_desc));
 	wr32(E1000_TDBAL(reg_idx),
@@ -4090,8 +4085,16 @@ void igb_configure_tx_ring(struct igb_adapter *adapter,
  **/
 static void igb_configure_tx(struct igb_adapter *adapter)
 {
+	struct e1000_hw *hw = &adapter->hw;
 	int i;
 
+	/* disable the queues */
+	for (i = 0; i < adapter->num_tx_queues; i++)
+		wr32(E1000_TXDCTL(adapter->tx_ring[i]->reg_idx), 0);
+
+	wrfl();
+	usleep_range(10000, 20000);
+
 	for (i = 0; i < adapter->num_tx_queues; i++)
 		igb_configure_tx_ring(adapter, adapter->tx_ring[i]);
 }