ionic: check for NULL structs on teardown

Make sure the queue structs exist before trying to tear
them down to make for safer error recovery.

Fixes: 0f3154e6 ("ionic: Add Tx and Rx handling")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -320,19 +320,21 @@ static void ionic_qcqs_free(struct ionic_lif *lif)
 		lif->adminqcq = NULL;
 	}
 
+	if (lif->rxqcqs) {
 		for (i = 0; i < lif->nxqs; i++)
 			if (lif->rxqcqs[i].stats)
 				devm_kfree(dev, lif->rxqcqs[i].stats);
-
 		devm_kfree(dev, lif->rxqcqs);
 		lif->rxqcqs = NULL;
+	}
 
+	if (lif->txqcqs) {
 		for (i = 0; i < lif->nxqs; i++)
 			if (lif->txqcqs[i].stats)
 				devm_kfree(dev, lif->txqcqs[i].stats);
-
 		devm_kfree(dev, lif->txqcqs);
 		lif->txqcqs = NULL;
+	}
 }
 
 static void ionic_link_qcq_interrupts(struct ionic_qcq *src_qcq,

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

@@ -243,11 +243,16 @@ static void ionic_adminq_cb(struct ionic_queue *q,
 
 static int ionic_adminq_post(struct ionic_lif *lif, struct ionic_admin_ctx *ctx)
 {
-	struct ionic_queue *adminq = &lif->adminqcq->q;
+	struct ionic_queue *adminq;
 	int err = 0;
 
 	WARN_ON(in_interrupt());
 
+	if (!lif->adminqcq)
+		return -EIO;
+
+	adminq = &lif->adminqcq->q;
+
 	spin_lock(&lif->adminq_lock);
 	if (!ionic_q_has_space(adminq, 1)) {
 		err = -ENOSPC;