From: Stefan Wahren <redacted>
Date: Tue, 18 Oct 2016 13:27:34 +0200

+void
+qca_tty_receive(struct tty_struct *tty, const unsigned char *cp, char *fp,
+		int count)
+{
+	struct qcauart *qca = tty->disc_data;
+	struct net_device_stats *n_stats = &qca->net_dev->stats;
+	int dropped = 0;

Please order local variable declarations from longest to shortest line.

+netdev_tx_t
+qcauart_netdev_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct qcauart *qca = netdev_priv(dev);
+	struct net_device_stats *n_stats = &dev->stats;
+	u8 *pos;
+	u8 pad_len = 0;
+	int written;

Likewise.