ionic: lif debugfs refresh on reset

Remove and restore the lif's debugfs pointers on a reset,
and make sure to check for the dentry before removing it
in case an earlier reset failed to rebuild the lif.

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c

@@ -437,6 +437,7 @@ static void ionic_reset_prepare(struct pci_dev *pdev)
 	ionic_txrx_free(lif);
 	ionic_lif_deinit(lif);
 	ionic_qcqs_free(lif);
+	ionic_debugfs_del_lif(lif);
 	mutex_unlock(&lif->queue_lock);
 
 	ionic_dev_teardown(ionic);

drivers/net/ethernet/pensando/ionic/ionic_debugfs.c

@@ -287,6 +287,9 @@ void ionic_debugfs_add_lif(struct ionic_lif *lif)
 
 void ionic_debugfs_del_lif(struct ionic_lif *lif)
 {
+	if (!lif->dentry)
+		return;
+
 	debugfs_remove_recursive(lif->dentry);
 	lif->dentry = NULL;
 }