ixgbevf: Handle previously-freed msix_entries

The msix_entries memory can be freed by a previous suspend or
remove, so don't crash on close when it isn't there. Also only
clear the interrupts when the interface is up, because there
aren't any when it is not up.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

@@ -1498,6 +1498,9 @@ static void ixgbevf_free_irq(struct ixgbevf_adapter *adapter)
 {
 	int i, q_vectors;
 
+	if (!adapter->msix_entries)
+		return;
+
 	q_vectors = adapter->num_msix_vectors;
 	i = q_vectors - 1;
 
@@ -2552,6 +2555,9 @@ static void ixgbevf_free_q_vectors(struct ixgbevf_adapter *adapter)
  **/
 static void ixgbevf_reset_interrupt_capability(struct ixgbevf_adapter *adapter)
 {
+	if (!adapter->msix_entries)
+		return;
+
 	pci_disable_msix(adapter->pdev);
 	kfree(adapter->msix_entries);
 	adapter->msix_entries = NULL;
@@ -3794,11 +3800,10 @@ static int ixgbevf_suspend(struct pci_dev *pdev, pm_message_t state)
 		ixgbevf_free_irq(adapter);
 		ixgbevf_free_all_tx_resources(adapter);
 		ixgbevf_free_all_rx_resources(adapter);
+		ixgbevf_clear_interrupt_scheme(adapter);
 		rtnl_unlock();
 	}
 
-	ixgbevf_clear_interrupt_scheme(adapter);
-
 #ifdef CONFIG_PM
 	retval = pci_save_state(pdev);
 	if (retval)