Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 3d21790..bcb5bf7 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -219,7 +219,7 @@
 static bool pmz_receive_chars(struct uart_pmac_port *uap)
 {
 	struct tty_port *port;
-	unsigned char ch, r1, drop, error, flag;
+	unsigned char ch, r1, drop, flag;
 	int loops = 0;
 
 	/* Sanity check, make sure the old bug is no longer happening */
@@ -231,7 +231,6 @@
 	port = &uap->port.state->port;
 
 	while (1) {
-		error = 0;
 		drop = 0;
 
 		r1 = read_zsreg(uap, R1);
@@ -273,7 +272,6 @@
 		uap->port.icount.rx++;
 
 		if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) {
-			error = 1;
 			if (r1 & BRK_ABRT) {
 				pmz_debug("pmz: got break !\n");
 				r1 &= ~(PAR_ERR | CRC_ERR);
@@ -1566,9 +1564,9 @@
 	 * to work around bugs in ancient Apple device-trees
 	 */
 	if (macio_request_resources(uap->dev, "pmac_zilog"))
-		printk(KERN_WARNING "%s: Failed to request resource"
+		printk(KERN_WARNING "%pOFn: Failed to request resource"
 		       ", port still active\n",
-		       uap->node->name);
+		       uap->node);
 	else
 		uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;
 
@@ -1650,9 +1648,9 @@
 		 */
 		node_a = node_b = NULL;
 		for (np = NULL; (np = of_get_next_child(node_p, np)) != NULL;) {
-			if (strncmp(np->name, "ch-a", 4) == 0)
+			if (of_node_name_prefix(np, "ch-a"))
 				node_a = of_node_get(np);
-			else if (strncmp(np->name, "ch-b", 4) == 0)
+			else if (of_node_name_prefix(np, "ch-b"))
 				node_b = of_node_get(np);
 		}
 		if (!node_a && !node_b) {